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bfbcd1fe86
Impala shell can accidentally convert certain literal strings to lowercase. Impala shell splits each command into tokens and then converts the first token to lowercase to figure out how it should execute the command. The splitting is done by spaces only. Thus, if the user types a TAB after the SELECT, the first token after the split becomes the SELECT plus whatever comes after it. Testing: TestImpalaShellInteractive.test_case_sensitive_command TestImpalaShellInteractive.test_unexpected_conversion_for_literal_string_to_lowercase TestImpalaShell.test_var_substitution Change-Id: Ifdce9781d1d97596c188691b62a141b9bd137610 Reviewed-on: http://gerrit.cloudera.org:8080/8762 Reviewed-by: Zoltan Borok-Nagy <boroknagyz@cloudera.com> Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins
1621 lines
64 KiB
Python
Executable File
1621 lines
64 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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# Impala's shell
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import cmd
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import errno
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import getpass
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import os
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import prettytable
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import random
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import re
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import shlex
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import signal
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import socket
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import sqlparse
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import subprocess
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import sys
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import textwrap
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import time
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from impala_client import (ImpalaClient, DisconnectedException, QueryStateException,
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RPCException, TApplicationException,
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QueryCancelledByShellException)
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from impala_shell_config_defaults import impala_shell_defaults
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from option_parser import get_option_parser, get_config_from_file
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from shell_output import DelimitedOutputFormatter, OutputStream, PrettyOutputFormatter
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from shell_output import OverwritingStdErrOutputStream
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from subprocess import call
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from thrift.Thrift import TException
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VERSION_FORMAT = "Impala Shell v%(version)s (%(git_hash)s) built on %(build_date)s"
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VERSION_STRING = "build version not available"
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READLINE_UNAVAILABLE_ERROR = "The readline module was either not found or disabled. " \
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"Command history will not be collected."
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# Tarball / packaging build makes impala_build_version available
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try:
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from impala_build_version import get_git_hash, get_build_date, get_version
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VERSION_STRING = VERSION_FORMAT % {'version': get_version(),
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'git_hash': get_git_hash()[:7],
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'build_date': get_build_date()}
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except Exception:
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pass
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class CmdStatus:
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"""Values indicate the execution status of a command to the cmd shell driver module
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SUCCESS and ERROR continue running the shell and ABORT exits the shell
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Since SUCCESS == None, successful commands do not need to explicitly return
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anything on completion
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"""
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SUCCESS = None
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ABORT = True
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ERROR = False
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class ImpalaPrettyTable(prettytable.PrettyTable):
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"""Patched version of PrettyTable that TODO"""
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def _unicode(self, value):
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if not isinstance(value, basestring):
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value = str(value)
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if not isinstance(value, unicode):
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# If a value cannot be encoded, replace it with a placeholder.
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value = unicode(value, self.encoding, "replace")
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return value
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class QueryOptionLevels:
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"""These are the levels used when displaying query options.
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The values correspond to the ones in TQueryOptionLevel"""
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REGULAR = 0
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ADVANCED = 1
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DEVELOPMENT = 2
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DEPRECATED = 3
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class QueryOptionDisplayModes:
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REGULAR_OPTIONS_ONLY = 1
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ALL_OPTIONS = 2
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class ImpalaShell(object, cmd.Cmd):
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""" Simple Impala Shell.
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Basic usage: type connect <host:port> to connect to an impalad
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Then issue queries or other commands. Tab-completion should show the set of
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available commands.
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Methods that implement shell commands return a boolean tuple (stop, status)
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stop is a flag the command loop uses to continue/discontinue the prompt.
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Status tells the caller that the command completed successfully.
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"""
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# If not connected to an impalad, the server version is unknown.
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UNKNOWN_SERVER_VERSION = "Not Connected"
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DISCONNECTED_PROMPT = "[Not connected] > "
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UNKNOWN_WEBSERVER = "0.0.0.0"
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# Message to display in shell when cancelling a query
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CANCELLATION_MESSAGE = ' Cancelling Query'
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# Number of times to attempt cancellation before giving up.
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CANCELLATION_TRIES = 3
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# Commands are terminated with the following delimiter.
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CMD_DELIM = ';'
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# Valid variable name pattern
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VALID_VAR_NAME_PATTERN = r'[A-Za-z][A-Za-z0-9_]*'
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# Pattern for removal of comments preceding SET commands
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COMMENTS_BEFORE_SET_PATTERN = r'^(\s*/\*(.|\n)*?\*/|\s*--.*\n)*\s*((un)?set)'
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COMMENTS_BEFORE_SET_REPLACEMENT = r'\3'
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# Variable names are prefixed with the following string
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VAR_PREFIXES = [ 'VAR', 'HIVEVAR' ]
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DEFAULT_DB = 'default'
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# Regex applied to all tokens of a query to detect DML statements.
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DML_REGEX = re.compile("^(insert|upsert|update|delete)$", re.I)
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# Seperator for queries in the history file.
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HISTORY_FILE_QUERY_DELIM = '_IMP_DELIM_'
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VALID_SHELL_OPTIONS = {
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'LIVE_PROGRESS' : (lambda x: x in ("true", "TRUE", "True", "1"), "print_progress"),
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'LIVE_SUMMARY' : (lambda x: x in ("true", "TRUE", "True", "1"), "print_summary")
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}
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# Minimum time in seconds between two calls to get the exec summary.
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PROGRESS_UPDATE_INTERVAL = 1.0
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def __init__(self, options, query_options):
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cmd.Cmd.__init__(self)
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self.is_alive = True
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self.impalad = None
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self.use_kerberos = options.use_kerberos
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self.kerberos_service_name = options.kerberos_service_name
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self.use_ssl = options.ssl
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self.ca_cert = options.ca_cert
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self.user = options.user
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self.ldap_password = options.ldap_password
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self.use_ldap = options.use_ldap
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self.verbose = options.verbose
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self.prompt = ImpalaShell.DISCONNECTED_PROMPT
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self.server_version = ImpalaShell.UNKNOWN_SERVER_VERSION
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self.webserver_address = ImpalaShell.UNKNOWN_WEBSERVER
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self.refresh_after_connect = options.refresh_after_connect
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self.current_db = options.default_db
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self.history_file = os.path.expanduser("~/.impalahistory")
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# Stores the state of user input until a delimiter is seen.
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self.partial_cmd = str()
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# Stores the old prompt while the user input is incomplete.
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self.cached_prompt = str()
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self.show_profiles = options.show_profiles
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# Output formatting flags/options
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self.output_file = options.output_file
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self.output_delimiter = options.output_delimiter
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self.write_delimited = options.write_delimited
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self.print_header = options.print_header
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self.progress_stream = OverwritingStdErrOutputStream()
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self.set_query_options = query_options
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self.set_variables = options.variables
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self._populate_command_list()
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self.imp_client = None;
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self.orig_cmd = None
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# Tracks query handle of the last query executed. Used by the 'profile' command.
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self.last_query_handle = None;
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self.query_handle_closed = None
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self.print_summary = options.print_summary
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self.print_progress = options.print_progress
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self.ignore_query_failure = options.ignore_query_failure
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# Due to a readline bug in centos/rhel7, importing it causes control characters to be
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# printed. This breaks any scripting against the shell in non-interactive mode. Since
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# the non-interactive mode does not need readline - do not import it.
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if options.query or options.query_file:
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self.interactive = False
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self._disable_readline()
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else:
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self.interactive = True
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try:
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self.readline = __import__('readline')
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try:
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self.readline.set_history_length(int(options.history_max))
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except ValueError:
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print_to_stderr("WARNING: history_max option malformed %s\n"
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% options.history_max)
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self.readline.set_history_length(1000)
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except ImportError:
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self._disable_readline()
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if options.impalad is not None:
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self.do_connect(options.impalad)
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# We handle Ctrl-C ourselves, using an Event object to signal cancellation
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# requests between the handler and the main shell thread.
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signal.signal(signal.SIGINT, self._signal_handler)
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def _populate_command_list(self):
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"""Populate a list of commands in the shell.
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Each command has its own method of the form do_<command>, and can be extracted by
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introspecting the class directory.
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"""
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# Slice the command method name to get the name of the command.
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self.commands = [cmd[3:] for cmd in dir(self.__class__) if cmd.startswith('do_')]
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def _disable_readline(self):
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"""Disables the readline module.
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The readline module is responsible for keeping track of command history.
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"""
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self.readline = None
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def _print_options(self, print_mode):
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"""Prints the current query options with default values distinguished from set values
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by brackets [], followed by shell-local options.
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The options are displayed in groups based on option levels received in parameter.
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Input parameter decides whether all groups or just the 'Regular' and 'Advanced'
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options are displayed."""
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print "Query options (defaults shown in []):"
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if not self.imp_client.default_query_options and not self.set_query_options:
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print '\tNo options available.'
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else:
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(regular_options, advanced_options, development_options, deprecated_options) = \
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self._get_query_option_grouping()
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self._print_option_group(regular_options)
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# If the shell is connected to an Impala that predates IMPALA-2181 then
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# the advanced_options would be empty and only the regular options would
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# be displayed.
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if advanced_options:
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print '\nAdvanced Query Options:'
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self._print_option_group(advanced_options)
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if print_mode == QueryOptionDisplayModes.ALL_OPTIONS:
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if development_options:
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print '\nDevelopment Query Options:'
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self._print_option_group(development_options)
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if deprecated_options:
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print '\nDeprecated Query Options:'
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self._print_option_group(deprecated_options)
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self._print_shell_options()
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def _get_query_option_grouping(self):
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"""For all the query options received through rpc this function determines the
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query option level for display purposes using the received query_option_levels
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parameters.
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If the option level can't be determined then it defaults to 'REGULAR'"""
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regular_options, advanced_options, development_options, deprecated_options = \
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{}, {}, {}, {}
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for option_name, option_value in self.imp_client.default_query_options.iteritems():
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level = self.imp_client.query_option_levels.get(option_name,
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QueryOptionLevels.REGULAR)
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if level == QueryOptionLevels.REGULAR:
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regular_options[option_name] = option_value
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elif level == QueryOptionLevels.DEVELOPMENT:
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development_options[option_name] = option_value
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elif level == QueryOptionLevels.DEPRECATED:
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deprecated_options[option_name] = option_value
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else:
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advanced_options[option_name] = option_value
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return (regular_options, advanced_options, development_options, deprecated_options)
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def _print_option_group(self, query_options):
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"""Gets query options and prints them. Value is inside [] for the ones having
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default values.
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query_options parameter is a subset of the default_query_options map"""
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for option_name in sorted(query_options):
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if (option_name in self.set_query_options and
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self.set_query_options[option_name] != query_options[option_name]):
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print '\n'.join(["\t%s: %s" % (option_name, self.set_query_options[option_name])])
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else:
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print '\n'.join(["\t%s: [%s]" % (option_name, query_options[option_name])])
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def _print_variables(self):
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# Prints the currently defined variables.
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if not self.set_variables:
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print '\tNo variables defined.'
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else:
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for k in sorted(self.set_variables):
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print '\n'.join(["\t%s: %s" % (k, self.set_variables[k])])
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def _print_shell_options(self):
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"""Prints shell options, which are local and independent of query options."""
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print "\nShell Options"
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for x in self.VALID_SHELL_OPTIONS:
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print "\t%s: %s" % (x, self.__dict__[self.VALID_SHELL_OPTIONS[x][1]])
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def _create_beeswax_query(self, args):
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"""Original command should be stored before running the method. The method is usually
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used in do_* methods and the command is kept at precmd()."""
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command = self.orig_cmd
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self.orig_cmd = None
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if not command:
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print_to_stderr("Unexpected error: Failed to execute query due to command "\
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"is missing")
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sys.exit(1)
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return self.imp_client.create_beeswax_query("%s %s" % (command, args),
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self.set_query_options)
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def do_shell(self, args):
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"""Run a command on the shell
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Usage: shell <cmd>
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! <cmd>
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"""
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try:
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start_time = time.time()
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os.system(args)
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self._print_if_verbose("--------\nExecuted in %2.2fs" % (time.time() - start_time))
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except Exception, e:
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print_to_stderr('Error running command : %s' % e)
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return CmdStatus.ERROR
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def _remove_comments_before_set(self, line):
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"""SET commands preceded by a comment become a SET query, which are not processed
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locally. SET VAR:* commands must be processed locally, since they are not known
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to the frontend. Thus, we remove comments that precede SET commands to enforce the
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local processing."""
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regexp = re.compile(ImpalaShell.COMMENTS_BEFORE_SET_PATTERN, re.IGNORECASE)
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return regexp.sub(ImpalaShell.COMMENTS_BEFORE_SET_REPLACEMENT, line, 1)
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def sanitise_input(self, args):
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# A command terminated by a semi-colon is legal. Check for the trailing
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# semi-colons and strip them from the end of the command.
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if not self.interactive:
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# Strip all the non-interactive commands of the delimiter.
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args = self._remove_comments_before_set(args)
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tokens = args.strip().split(' ')
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return ' '.join(tokens).rstrip(ImpalaShell.CMD_DELIM)
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# Handle EOF if input is interactive
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tokens = args.strip().split(' ')
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if tokens[0].lower() == 'eof':
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if not self.partial_cmd:
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# The first token is the command.
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# If it's EOF, call do_quit()
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return 'quit'
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else:
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# If a command is in progress and the user hits a Ctrl-D, clear its state
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# and reset the prompt.
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self.prompt = self.cached_prompt
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self.partial_cmd = str()
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# The print statement makes the new prompt appear in a new line.
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# Also print an extra newline to indicate that the current command has
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# been cancelled.
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print '\n'
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return str()
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args = self._check_for_command_completion(args)
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args = self._remove_comments_before_set(args)
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tokens = args.strip().split(' ')
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args = ' '.join(tokens).strip()
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return args.rstrip(ImpalaShell.CMD_DELIM)
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def _shlex_split(self, line):
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"""Reimplement shlex.split() so that escaped single quotes
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are actually escaped. shlex.split() only escapes double quotes
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by default. This method will throw a ValueError if an open
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quotation (either single or double) is found.
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"""
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my_split = shlex.shlex(line, posix=True)
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my_split.escapedquotes = '"\''
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my_split.whitespace_split = True
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my_split.commenters = ''
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return list(my_split)
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def _cmd_ends_with_delim(self, line):
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"""Check if the input command ends with a command delimiter.
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A command ending with the delimiter and containing an open quotation character is
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not considered terminated. If no open quotation is found, it's considered
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terminated.
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"""
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if line.endswith(ImpalaShell.CMD_DELIM):
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try:
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# Look for an open quotation in the entire command, and not just the
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# current line.
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if self.partial_cmd: line = '%s %s' % (self.partial_cmd, line)
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self._shlex_split(line)
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return True
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# If the command ends with a delimiter, check if it has an open quotation.
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# shlex in self._split() throws a ValueError iff an open quotation is found.
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# A quotation can either be a single quote or a double quote.
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except ValueError:
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pass
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# This checks to see if there are any backslashed quotes
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# outside of quotes, since backslashed quotes
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# outside of single or double quotes should not be escaped.
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# Ex. 'abc\'xyz' -> closed because \' is escaped
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# \'abcxyz -> open because \' is not escaped
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# \'abcxyz' -> closed
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# Iterate through the line and switch the state if a single or double quote is found
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# and ignore escaped single and double quotes if the line is considered open (meaning
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# a previous single or double quote has not been closed yet)
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state_closed = True;
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opener = None;
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for i, char in enumerate(line):
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if state_closed and (char in ['\'', '\"']):
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state_closed = False
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opener = char
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elif not state_closed and opener == char:
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if line[i - 1] != '\\':
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state_closed = True
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opener = None;
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return state_closed
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return False
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def _check_for_command_completion(self, cmd):
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"""Check for a delimiter at the end of user input.
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|
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The end of the user input is scanned for a legal delimiter.
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If a delimiter is not found:
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- Input is not send to onecmd()
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- onecmd() is a method in Cmd which routes the user input to the
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appropriate method. An empty string results in a no-op.
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- Input is removed from history.
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- Input is appended to partial_cmd
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If a delimiter is found:
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- The contents of partial_cmd are put in history, as they represent
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a completed command.
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- The contents are passed to the appropriate method for execution.
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- partial_cmd is reset to an empty string.
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"""
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if self.readline: current_history_len = self.readline.get_current_history_length()
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# Input is incomplete, store the contents and do nothing.
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if not self._cmd_ends_with_delim(cmd):
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# The user input is incomplete, change the prompt to reflect this.
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if not self.partial_cmd and cmd:
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self.cached_prompt = self.prompt
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self.prompt = '> '.rjust(len(self.cached_prompt))
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# partial_cmd is already populated, add the current input after a newline.
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if self.partial_cmd and cmd:
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self.partial_cmd = "%s\n%s" % (self.partial_cmd, cmd)
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else:
|
|
# If the input string is empty or partial_cmd is empty.
|
|
self.partial_cmd = "%s%s" % (self.partial_cmd, cmd)
|
|
# Remove the most recent item from history if:
|
|
# -- The current state of user input in incomplete.
|
|
# -- The most recent user input is not an empty string
|
|
if self.readline and current_history_len > 0 and cmd:
|
|
self.readline.remove_history_item(current_history_len - 1)
|
|
# An empty string results in a no-op. Look at emptyline()
|
|
return str()
|
|
elif self.partial_cmd: # input ends with a delimiter and partial_cmd is not empty
|
|
if cmd != ImpalaShell.CMD_DELIM:
|
|
completed_cmd = "%s\n%s" % (self.partial_cmd, cmd)
|
|
else:
|
|
completed_cmd = "%s%s" % (self.partial_cmd, cmd)
|
|
# Reset partial_cmd to an empty string
|
|
self.partial_cmd = str()
|
|
# Replace the most recent history item with the completed command.
|
|
completed_cmd = sqlparse.format(completed_cmd)
|
|
if self.readline and current_history_len > 0:
|
|
self.readline.replace_history_item(current_history_len - 1,
|
|
completed_cmd.encode('utf-8'))
|
|
# Revert the prompt to its earlier state
|
|
self.prompt = self.cached_prompt
|
|
else: # Input has a delimiter and partial_cmd is empty
|
|
completed_cmd = sqlparse.format(cmd)
|
|
return completed_cmd
|
|
|
|
def _new_impala_client(self):
|
|
return ImpalaClient(self.impalad, self.use_kerberos,
|
|
self.kerberos_service_name, self.use_ssl,
|
|
self.ca_cert, self.user, self.ldap_password,
|
|
self.use_ldap)
|
|
|
|
def _signal_handler(self, signal, frame):
|
|
"""Handles query cancellation on a Ctrl+C event"""
|
|
if self.last_query_handle is None or self.query_handle_closed:
|
|
return
|
|
# Create a new connection to the impalad and cancel the query.
|
|
for cancel_try in xrange(ImpalaShell.CANCELLATION_TRIES):
|
|
try:
|
|
self.imp_client.is_query_cancelled = True
|
|
self.query_handle_closed = True
|
|
print_to_stderr(ImpalaShell.CANCELLATION_MESSAGE)
|
|
new_imp_client = self._new_impala_client()
|
|
new_imp_client.connect()
|
|
new_imp_client.cancel_query(self.last_query_handle, False)
|
|
self.imp_client.close_query(self.last_query_handle)
|
|
break
|
|
except Exception, e:
|
|
# Suppress harmless errors.
|
|
err_msg = str(e).strip()
|
|
if err_msg in ['ERROR: Cancelled', 'ERROR: Invalid or unknown query handle']:
|
|
break
|
|
print_to_stderr("Failed to reconnect and close (try %i/%i): %s" % (
|
|
cancel_try + 1, ImpalaShell.CANCELLATION_TRIES, err_msg))
|
|
|
|
def _replace_variables(self, query):
|
|
"""Replaces variable within the query text with their corresponding values"""
|
|
errors = False
|
|
matches = set(map(lambda v: v.upper(), re.findall(r'(?<!\\)\${([^}]+)}', query)))
|
|
for name in matches:
|
|
value = None
|
|
# Check if syntax is correct
|
|
var_name = self._get_var_name(name)
|
|
if var_name is None:
|
|
print_to_stderr('Error: Unknown substitution syntax (%s). ' % (name,) + \
|
|
'Use ${VAR:var_name}.')
|
|
errors = True
|
|
else:
|
|
# Replaces variable value
|
|
if self.set_variables and var_name in self.set_variables:
|
|
value = self.set_variables[var_name]
|
|
regexp = re.compile(r'(?<!\\)\${%s}' % (name,), re.IGNORECASE)
|
|
query = regexp.sub(value, query)
|
|
else:
|
|
print_to_stderr('Error: Unknown variable %s' % (var_name))
|
|
errors = True
|
|
if errors:
|
|
return None
|
|
else:
|
|
return query
|
|
|
|
def precmd(self, args):
|
|
args = self.sanitise_input(args)
|
|
if not args: return args
|
|
# Split args using sqlparse. If there are multiple queries present in user input,
|
|
# the length of the returned query list will be greater than one.
|
|
parsed_cmds = sqlparse.split(args)
|
|
if len(parsed_cmds) > 1:
|
|
# The last command needs a delimiter to be successfully executed.
|
|
parsed_cmds[-1] += ImpalaShell.CMD_DELIM
|
|
self.cmdqueue.extend(parsed_cmds)
|
|
# If cmdqueue is populated, then commands are executed from the cmdqueue, and user
|
|
# input is ignored. Send an empty string as the user input just to be safe.
|
|
return str()
|
|
try:
|
|
self.imp_client.test_connection()
|
|
except TException:
|
|
print_to_stderr("Connection lost, reconnecting...")
|
|
self._connect()
|
|
self._validate_database(immediately=True)
|
|
return args.encode('utf-8')
|
|
|
|
def onecmd(self, line):
|
|
"""Overridden to ensure the variable replacement is processed in interactive
|
|
as well as non-interactive mode, since the precmd method would only work for
|
|
the interactive case, when cmdloop is called.
|
|
"""
|
|
# Replace variables in the statement before it's executed
|
|
line = self._replace_variables(line)
|
|
# Cmd is an old-style class, hence we need to call the method directly
|
|
# instead of using super()
|
|
# TODO: This may have to be changed to a super() call once we move to Python 3
|
|
if line == None:
|
|
return CmdStatus.ERROR
|
|
else:
|
|
# This code is based on the code from the standard Python library package cmd.py:
|
|
# https://github.com/python/cpython/blob/master/Lib/cmd.py#L192
|
|
# One change is lowering command before getting a function. The lowering
|
|
# is necessary to find a proper function and here is a right place
|
|
# because the lowering command in front of the finding can avoid a
|
|
# side effect.
|
|
command, arg, line = self.parseline(line)
|
|
if not line:
|
|
return self.emptyline()
|
|
if command is None:
|
|
return self.default(line)
|
|
self.lastcmd = line
|
|
if line == 'EOF' :
|
|
self.lastcmd = ''
|
|
if command == '':
|
|
return self.default(line)
|
|
else:
|
|
try:
|
|
func = getattr(self, 'do_' + command.lower())
|
|
self.orig_cmd = command
|
|
except AttributeError:
|
|
return self.default(line)
|
|
return func(arg)
|
|
|
|
def postcmd(self, status, args):
|
|
# status conveys to shell how the shell should continue execution
|
|
# should always be a CmdStatus
|
|
return status
|
|
|
|
def do_summary(self, args):
|
|
summary = None
|
|
try:
|
|
summary = self.imp_client.get_summary(self.last_query_handle)
|
|
except RPCException, e:
|
|
import re
|
|
error_pattern = re.compile("ERROR: Query id \d+:\d+ not found.")
|
|
if error_pattern.match(e.value):
|
|
print_to_stderr("Could not retrieve summary for query.")
|
|
else:
|
|
print_to_stderr(e)
|
|
return CmdStatus.ERROR
|
|
if summary.nodes is None:
|
|
print_to_stderr("Summary not available")
|
|
return CmdStatus.SUCCESS
|
|
output = []
|
|
table = self._default_summary_table()
|
|
self.imp_client.build_summary_table(summary, 0, False, 0, False, output)
|
|
formatter = PrettyOutputFormatter(table)
|
|
self.output_stream = OutputStream(formatter, filename=self.output_file)
|
|
self.output_stream.write(output)
|
|
|
|
def _handle_shell_options(self, token, value):
|
|
try:
|
|
handle = self.VALID_SHELL_OPTIONS[token]
|
|
self.__dict__[handle[1]] = handle[0](value)
|
|
return True
|
|
except KeyError:
|
|
return False
|
|
|
|
def _get_var_name(self, name):
|
|
"""Look for a namespace:var_name pattern in an option name.
|
|
Return the variable name if it's a match or None otherwise.
|
|
"""
|
|
ns_match = re.match(r'^([^:]*):(.*)', name)
|
|
if ns_match is not None:
|
|
ns = ns_match.group(1)
|
|
var_name = ns_match.group(2)
|
|
if ns in ImpalaShell.VAR_PREFIXES:
|
|
return var_name
|
|
return None
|
|
|
|
def _print_with_set(self, print_level):
|
|
self._print_options(print_level)
|
|
print "\nVariables:"
|
|
self._print_variables()
|
|
|
|
def do_set(self, args):
|
|
"""Set or display query options.
|
|
|
|
Display query options:
|
|
Usage: SET (to display the Regular options) or
|
|
SET ALL (to display all the options)
|
|
Set query options:
|
|
Usage: SET <option>=<value>
|
|
OR
|
|
SET VAR:<variable>=<value>
|
|
|
|
"""
|
|
# TODO: Expand set to allow for setting more than just query options.
|
|
if len(args) == 0:
|
|
self._print_with_set(QueryOptionDisplayModes.REGULAR_OPTIONS_ONLY)
|
|
return CmdStatus.SUCCESS
|
|
|
|
# Remove any extra spaces surrounding the tokens.
|
|
# Allows queries that have spaces around the = sign.
|
|
tokens = [arg.strip() for arg in args.split("=")]
|
|
if len(tokens) != 2:
|
|
if len(tokens) == 1 and tokens[0].upper() == "ALL":
|
|
self._print_with_set(QueryOptionDisplayModes.ALL_OPTIONS)
|
|
return CmdStatus.SUCCESS
|
|
else:
|
|
print_to_stderr("Error: SET <option>=<value>")
|
|
print_to_stderr(" OR")
|
|
print_to_stderr(" SET VAR:<variable>=<value>")
|
|
return CmdStatus.ERROR
|
|
option_upper = tokens[0].upper()
|
|
# Check if it's a variable
|
|
var_name = self._get_var_name(option_upper)
|
|
if var_name is not None:
|
|
# Set the variable
|
|
self.set_variables[var_name] = tokens[1]
|
|
self._print_if_verbose('Variable %s set to %s' % (var_name, tokens[1]))
|
|
elif not self._handle_shell_options(option_upper, tokens[1]):
|
|
if option_upper not in self.imp_client.default_query_options.keys():
|
|
print "Unknown query option: %s" % (tokens[0])
|
|
print "Available query options, with their values (defaults shown in []):"
|
|
self._print_options(QueryOptionDisplayModes.REGULAR_OPTIONS_ONLY)
|
|
return CmdStatus.ERROR
|
|
self.set_query_options[option_upper] = tokens[1]
|
|
self._print_if_verbose('%s set to %s' % (option_upper, tokens[1]))
|
|
|
|
def do_unset(self, args):
|
|
"""Unset a query option"""
|
|
if len(args.split()) != 1:
|
|
print 'Usage: unset <option>'
|
|
return CmdStatus.ERROR
|
|
option = args.upper()
|
|
# Check if it's a variable
|
|
var_name = self._get_var_name(option)
|
|
if var_name is not None:
|
|
if self.set_variables.get(var_name):
|
|
print 'Unsetting variable %s' % var_name
|
|
del self.set_variables[var_name]
|
|
else:
|
|
print "No variable called %s is set" % var_name
|
|
elif self.set_query_options.get(option):
|
|
print 'Unsetting option %s' % option
|
|
del self.set_query_options[option]
|
|
else:
|
|
print "No option called %s is set" % option
|
|
|
|
def do_quit(self, args):
|
|
"""Quit the Impala shell"""
|
|
self._print_if_verbose("Goodbye " + self.user)
|
|
self.is_alive = False
|
|
return CmdStatus.ABORT
|
|
|
|
def do_exit(self, args):
|
|
"""Exit the impala shell"""
|
|
return self.do_quit(args)
|
|
|
|
def do_connect(self, args):
|
|
"""Connect to an Impalad instance:
|
|
Usage: connect, defaults to the fqdn of the localhost and port 21000
|
|
connect <hostname:port>
|
|
connect <hostname>, defaults to port 21000
|
|
|
|
"""
|
|
# Assume the user wants to connect to the local impalad if no connection string is
|
|
# specified. Connecting to a kerberized impalad requires an fqdn as the host name.
|
|
if self.use_ldap and self.ldap_password is None:
|
|
self.ldap_password = getpass.getpass("LDAP password for %s: " % self.user)
|
|
|
|
if not args: args = socket.getfqdn()
|
|
tokens = args.split(" ")
|
|
# validate the connection string.
|
|
host_port = [val for val in tokens[0].split(':') if val.strip()]
|
|
if (':' in tokens[0] and len(host_port) != 2):
|
|
print_to_stderr("Connection string must either be empty, or of the form "
|
|
"<hostname[:port]>")
|
|
return CmdStatus.ERROR
|
|
elif len(host_port) == 1:
|
|
host_port.append('21000')
|
|
self.impalad = tuple(host_port)
|
|
if self.imp_client: self.imp_client.close_connection()
|
|
self.imp_client = self._new_impala_client()
|
|
self._connect()
|
|
# If the connection fails and the Kerberos has not been enabled,
|
|
# check for a valid kerberos ticket and retry the connection
|
|
# with kerberos enabled.
|
|
if not self.imp_client.connected and not self.use_kerberos:
|
|
try:
|
|
if call(["klist", "-s"]) == 0:
|
|
print_to_stderr("Kerberos ticket found in the credentials cache, retrying "
|
|
"the connection with a secure transport.")
|
|
self.use_kerberos = True
|
|
self.use_ldap = False
|
|
self.ldap_password = None
|
|
self.imp_client = self._new_impala_client()
|
|
self._connect()
|
|
except OSError, e:
|
|
pass
|
|
|
|
if self.imp_client.connected:
|
|
self._print_if_verbose('Connected to %s:%s' % self.impalad)
|
|
self._print_if_verbose('Server version: %s' % self.server_version)
|
|
self.prompt = "[%s:%s] > " % self.impalad
|
|
if self.refresh_after_connect:
|
|
self.cmdqueue.append('invalidate metadata' + ImpalaShell.CMD_DELIM)
|
|
print_to_stderr("Invalidating Metadata")
|
|
self._validate_database()
|
|
try:
|
|
self.imp_client.build_default_query_options_dict()
|
|
except RPCException, e:
|
|
print_to_stderr(e)
|
|
# In the case that we lost connection while a command was being entered,
|
|
# we may have a dangling command, clear partial_cmd
|
|
self.partial_cmd = str()
|
|
# Check if any of query options set by the user are inconsistent
|
|
# with the impalad being connected to
|
|
|
|
# Use a temporary to avoid changing set_query_options during iteration.
|
|
new_query_options = {}
|
|
for set_option, value in self.set_query_options.iteritems():
|
|
if set_option not in set(self.imp_client.default_query_options):
|
|
print ('%s is not supported for the impalad being '
|
|
'connected to, ignoring.' % set_option)
|
|
else:
|
|
new_query_options[set_option] = value
|
|
self.set_query_options = new_query_options
|
|
|
|
def _connect(self):
|
|
try:
|
|
result = self.imp_client.connect()
|
|
self.server_version = result.version
|
|
self.webserver_address = result.webserver_address
|
|
except TApplicationException:
|
|
# We get a TApplicationException if the transport is valid,
|
|
# but the RPC does not exist.
|
|
print_to_stderr("Error: Unable to communicate with impalad service. This "
|
|
"service may not be an impalad instance. Check host:port and try again.")
|
|
self.imp_client.close_connection()
|
|
raise
|
|
except ImportError:
|
|
print_to_stderr("Unable to import the python 'ssl' module. It is"
|
|
" required for an SSL-secured connection.")
|
|
sys.exit(1)
|
|
except socket.error, (code, e):
|
|
# if the socket was interrupted, reconnect the connection with the client
|
|
if code == errno.EINTR:
|
|
self._reconnect_cancellation()
|
|
else:
|
|
print_to_stderr("Socket error %s: %s" % (code, e))
|
|
self.prompt = self.DISCONNECTED_PROMPT
|
|
except Exception, e:
|
|
print_to_stderr("Error connecting: %s, %s" % (type(e).__name__, e))
|
|
# A secure connection may still be open. So we explicitly close it.
|
|
self.imp_client.close_connection()
|
|
# If a connection to another impalad failed while already connected
|
|
# reset the prompt to disconnected.
|
|
self.server_version = self.UNKNOWN_SERVER_VERSION
|
|
self.prompt = self.DISCONNECTED_PROMPT
|
|
|
|
def _reconnect_cancellation(self):
|
|
self._connect()
|
|
self._validate_database()
|
|
|
|
def _validate_database(self, immediately=False):
|
|
""" Issues a "USE <db>" command where <db> is the current database.
|
|
It is typically needed after the connection is (re-)established to the Impala daemon.
|
|
|
|
If immediately is False, it appends the USE command to self.cmdqueue.
|
|
If immediately is True, it executes the USE command right away.
|
|
"""
|
|
if self.current_db:
|
|
self.current_db = self.current_db.strip('`')
|
|
use_current_db = ('use `%s`' % self.current_db)
|
|
|
|
if immediately:
|
|
self.onecmd(use_current_db)
|
|
else:
|
|
self.cmdqueue.append(use_current_db + ImpalaShell.CMD_DELIM)
|
|
|
|
def _print_if_verbose(self, message):
|
|
if self.verbose:
|
|
print_to_stderr(message)
|
|
|
|
def print_runtime_profile(self, profile, status=False):
|
|
if self.show_profiles or status:
|
|
if profile is not None:
|
|
print "Query Runtime Profile:\n" + profile
|
|
|
|
def _parse_table_name_arg(self, arg):
|
|
""" Parses an argument string and returns the result as a db name, table name combo.
|
|
|
|
If the table name was not fully qualified, the current database is returned as the db.
|
|
Otherwise, the table is split into db/table name parts and returned.
|
|
If an invalid format is provided, None is returned.
|
|
"""
|
|
if not arg: return
|
|
# If a multi-line argument, the name might be split across lines
|
|
arg = arg.replace('\n', '')
|
|
# Get the database and table name, using the current database if the table name
|
|
# wasn't fully qualified.
|
|
db_name, tbl_name = self.current_db, arg
|
|
if db_name is None:
|
|
db_name = ImpalaShell.DEFAULT_DB
|
|
db_table_name = arg.split('.')
|
|
if len(db_table_name) == 1:
|
|
return db_name, db_table_name[0]
|
|
if len(db_table_name) == 2:
|
|
return db_table_name
|
|
|
|
def do_alter(self, args):
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_create(self, args):
|
|
# We want to print the webserver link only for CTAS queries.
|
|
print_web_link = "select" in args
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query, print_web_link=print_web_link)
|
|
|
|
def do_drop(self, args):
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_load(self, args):
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_profile(self, args):
|
|
"""Prints the runtime profile of the last DML statement or SELECT query executed."""
|
|
if len(args) > 0:
|
|
print_to_stderr("'profile' does not accept any arguments")
|
|
return CmdStatus.ERROR
|
|
elif self.last_query_handle is None:
|
|
print_to_stderr('No previous query available to profile')
|
|
return CmdStatus.ERROR
|
|
profile = self.imp_client.get_runtime_profile(self.last_query_handle)
|
|
return self.print_runtime_profile(profile, True)
|
|
|
|
def do_select(self, args):
|
|
"""Executes a SELECT... query, fetching all rows"""
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query, print_web_link=True)
|
|
|
|
def do_compute(self, args):
|
|
"""Executes a COMPUTE STATS query.
|
|
Impala shell cannot get child query handle so it cannot
|
|
query live progress for COMPUTE STATS query. Disable live
|
|
progress/summary callback for COMPUTE STATS query."""
|
|
query = self._create_beeswax_query(args)
|
|
(prev_print_progress, prev_print_summary) = self.print_progress, self.print_summary
|
|
(self.print_progress, self.print_summary) = False, False;
|
|
try:
|
|
ret = self._execute_stmt(query)
|
|
finally:
|
|
(self.print_progress, self.print_summary) = prev_print_progress, prev_print_summary
|
|
return ret
|
|
|
|
def _format_outputstream(self):
|
|
column_names = self.imp_client.get_column_names(self.last_query_handle)
|
|
if self.write_delimited:
|
|
formatter = DelimitedOutputFormatter(field_delim=self.output_delimiter)
|
|
self.output_stream = OutputStream(formatter, filename=self.output_file)
|
|
# print the column names
|
|
if self.print_header:
|
|
self.output_stream.write([column_names])
|
|
else:
|
|
prettytable = self.construct_table_with_header(column_names)
|
|
formatter = PrettyOutputFormatter(prettytable)
|
|
self.output_stream = OutputStream(formatter, filename=self.output_file)
|
|
|
|
def _periodic_wait_callback(self):
|
|
"""If enough time elapsed since the last call to the periodic callback,
|
|
execute the RPC to get the query exec summary and depending on the set options
|
|
print either the progress or the summary or both to stderr.
|
|
"""
|
|
if not self.print_progress and not self.print_summary: return
|
|
|
|
checkpoint = time.time()
|
|
if checkpoint - self.last_summary > self.PROGRESS_UPDATE_INTERVAL:
|
|
summary = self.imp_client.get_summary(self.last_query_handle)
|
|
if summary and summary.progress:
|
|
progress = summary.progress
|
|
|
|
# If the data is not complete return and wait for a good result.
|
|
if not progress.total_scan_ranges and not progress.num_completed_scan_ranges:
|
|
self.last_summary = time.time()
|
|
return
|
|
|
|
data = ""
|
|
if self.print_progress and progress.total_scan_ranges > 0:
|
|
val = ((summary.progress.num_completed_scan_ranges * 100) /
|
|
summary.progress.total_scan_ranges)
|
|
fragment_text = "[%s%s] %s%%\n" % ("#" * val, " " * (100 - val), val)
|
|
data += fragment_text
|
|
|
|
if self.print_summary:
|
|
table = self._default_summary_table()
|
|
output = []
|
|
self.imp_client.build_summary_table(summary, 0, False, 0, False, output)
|
|
formatter = PrettyOutputFormatter(table)
|
|
data += formatter.format(output) + "\n"
|
|
|
|
self.progress_stream.write(data)
|
|
self.last_summary = time.time()
|
|
|
|
def _default_summary_table(self):
|
|
return self.construct_table_with_header(["Operator", "#Hosts", "Avg Time", "Max Time",
|
|
"#Rows", "Est. #Rows", "Peak Mem",
|
|
"Est. Peak Mem", "Detail"])
|
|
|
|
def _execute_stmt(self, query, is_dml=False, print_web_link=False):
|
|
""" The logic of executing any query statement
|
|
|
|
The client executes the query and the query_handle is returned immediately,
|
|
even as the client waits for the query to finish executing.
|
|
|
|
If the query was not dml, the results are fetched from the client
|
|
as they are streamed in, through the use of a generator.
|
|
|
|
The execution time is printed and the query is closed if it hasn't been already
|
|
"""
|
|
|
|
self._print_if_verbose("Query: %s" % query.query)
|
|
# TODO: Clean up this try block and refactor it (IMPALA-3814)
|
|
try:
|
|
if self.webserver_address == ImpalaShell.UNKNOWN_WEBSERVER:
|
|
print_web_link = False
|
|
if print_web_link:
|
|
self._print_if_verbose("Query submitted at: %s (Coordinator: %s)" %
|
|
(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
|
|
self.webserver_address))
|
|
|
|
start_time = time.time()
|
|
self.last_query_handle = self.imp_client.execute_query(query)
|
|
self.query_handle_closed = False
|
|
self.last_summary = time.time()
|
|
if print_web_link:
|
|
self._print_if_verbose(
|
|
"Query progress can be monitored at: %s/query_plan?query_id=%s" %
|
|
(self.webserver_address, self.last_query_handle.id))
|
|
|
|
wait_to_finish = self.imp_client.wait_to_finish(self.last_query_handle,
|
|
self._periodic_wait_callback)
|
|
# Reset the progress stream.
|
|
self.progress_stream.clear()
|
|
|
|
if is_dml:
|
|
# retrieve the error log
|
|
warning_log = self.imp_client.get_warning_log(self.last_query_handle)
|
|
(num_rows, num_row_errors) = self.imp_client.close_dml(self.last_query_handle)
|
|
else:
|
|
# impalad does not support the fetching of metadata for certain types of queries.
|
|
if not self.imp_client.expect_result_metadata(query.query):
|
|
# Close the query
|
|
self.imp_client.close_query(self.last_query_handle)
|
|
self.query_handle_closed = True
|
|
return CmdStatus.SUCCESS
|
|
|
|
self._format_outputstream()
|
|
# fetch returns a generator
|
|
rows_fetched = self.imp_client.fetch(self.last_query_handle)
|
|
num_rows = 0
|
|
|
|
for rows in rows_fetched:
|
|
# IMPALA-4418: Break out of the loop to prevent printing an unnecessary empty line.
|
|
if len(rows) == 0:
|
|
break
|
|
self.output_stream.write(rows)
|
|
num_rows += len(rows)
|
|
|
|
# retrieve the error log
|
|
warning_log = self.imp_client.get_warning_log(self.last_query_handle)
|
|
|
|
end_time = time.time()
|
|
|
|
if warning_log:
|
|
self._print_if_verbose(warning_log)
|
|
# print 'Modified' when is_dml is true (i.e. 1), or 'Fetched' otherwise.
|
|
verb = ["Fetched", "Modified"][is_dml]
|
|
time_elapsed = end_time - start_time
|
|
|
|
# Add the number of row errors if this DML and the operation supports it.
|
|
# num_row_errors is None if the DML operation doesn't return it.
|
|
if is_dml and num_row_errors is not None:
|
|
error_report = ", %d row error(s)" % (num_row_errors)
|
|
else:
|
|
error_report = ""
|
|
|
|
self._print_if_verbose("%s %d row(s)%s in %2.2fs" %\
|
|
(verb, num_rows, error_report, time_elapsed))
|
|
|
|
if not is_dml:
|
|
self.imp_client.close_query(self.last_query_handle, self.query_handle_closed)
|
|
self.query_handle_closed = True
|
|
try:
|
|
profile = self.imp_client.get_runtime_profile(self.last_query_handle)
|
|
self.print_runtime_profile(profile)
|
|
except RPCException, e:
|
|
if self.show_profiles: raise e
|
|
return CmdStatus.SUCCESS
|
|
except QueryCancelledByShellException, e:
|
|
return CmdStatus.SUCCESS
|
|
except RPCException, e:
|
|
# could not complete the rpc successfully
|
|
print_to_stderr(e)
|
|
except QueryStateException, e:
|
|
# an exception occurred while executing the query
|
|
self.imp_client.close_query(self.last_query_handle, self.query_handle_closed)
|
|
print_to_stderr(e)
|
|
except DisconnectedException, e:
|
|
# the client has lost the connection
|
|
print_to_stderr(e)
|
|
self.imp_client.connected = False
|
|
self.prompt = ImpalaShell.DISCONNECTED_PROMPT
|
|
except socket.error, (code, e):
|
|
# if the socket was interrupted, reconnect the connection with the client
|
|
if code == errno.EINTR:
|
|
print ImpalaShell.CANCELLATION_MESSAGE
|
|
self._reconnect_cancellation()
|
|
else:
|
|
print_to_stderr("Socket error %s: %s" % (code, e))
|
|
self.prompt = self.DISCONNECTED_PROMPT
|
|
self.imp_client.connected = False
|
|
except Exception, u:
|
|
# if the exception is unknown, there was possibly an issue with the connection
|
|
# set the shell as disconnected
|
|
print_to_stderr('Unknown Exception : %s' % (u,))
|
|
self.imp_client.connected = False
|
|
self.prompt = ImpalaShell.DISCONNECTED_PROMPT
|
|
return CmdStatus.ERROR
|
|
|
|
def construct_table_with_header(self, column_names):
|
|
""" Constructs the table header for a given query handle.
|
|
|
|
Should be called after the query has finished and before data is fetched.
|
|
All data is left aligned.
|
|
"""
|
|
table = ImpalaPrettyTable()
|
|
for column in column_names:
|
|
# Column names may be encoded as utf-8
|
|
table.add_column(column.decode('utf-8', 'ignore'), [])
|
|
table.align = "l"
|
|
return table
|
|
|
|
def do_values(self, args):
|
|
"""Executes a VALUES(...) query, fetching all rows"""
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_with(self, args):
|
|
"""Executes a query with a WITH clause, fetching all rows"""
|
|
query = self._create_beeswax_query(args)
|
|
# Set posix=True and add "'" to escaped quotes
|
|
# to deal with escaped quotes in string literals
|
|
lexer = shlex.shlex(query.query.lstrip(), posix=True)
|
|
lexer.escapedquotes += "'"
|
|
# Because the WITH clause may precede DML or SELECT queries,
|
|
# just checking the first token is insufficient.
|
|
is_dml = False
|
|
tokens = list(lexer)
|
|
if filter(self.DML_REGEX.match, tokens): is_dml = True
|
|
return self._execute_stmt(query, is_dml=is_dml)
|
|
|
|
def do_use(self, args):
|
|
"""Executes a USE... query"""
|
|
query = self._create_beeswax_query(args)
|
|
if self._execute_stmt(query) is CmdStatus.SUCCESS:
|
|
self.current_db = args
|
|
else:
|
|
return CmdStatus.ERROR
|
|
|
|
def do_show(self, args):
|
|
"""Executes a SHOW... query, fetching all rows"""
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_describe(self, args):
|
|
"""Executes a DESCRIBE... query, fetching all rows"""
|
|
# original command should be overridden because the server cannot
|
|
# recognize "desc" as a keyword. Thus, given command should be
|
|
# replaced with "describe" here.
|
|
self.orig_cmd = "describe"
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_desc(self, args):
|
|
return self.do_describe(args)
|
|
|
|
def __do_dml(self, args):
|
|
"""Executes a DML query"""
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query, is_dml=True, print_web_link=True)
|
|
|
|
def do_upsert(self, args):
|
|
return self.__do_dml(args)
|
|
|
|
def do_update(self, args):
|
|
return self.__do_dml(args)
|
|
|
|
def do_delete(self, args):
|
|
return self.__do_dml(args)
|
|
|
|
def do_insert(self, args):
|
|
return self.__do_dml(args)
|
|
|
|
def do_explain(self, args):
|
|
"""Explain the query execution plan"""
|
|
query = self._create_beeswax_query(args)
|
|
return self._execute_stmt(query)
|
|
|
|
def do_history(self, args):
|
|
"""Display command history"""
|
|
# Deal with readline peculiarity. When history does not exist,
|
|
# readline returns 1 as the history length and stores 'None' at index 0.
|
|
if self.readline and self.readline.get_current_history_length() > 0:
|
|
for index in xrange(1, self.readline.get_current_history_length() + 1):
|
|
cmd = self.readline.get_history_item(index)
|
|
print_to_stderr('[%d]: %s' % (index, cmd))
|
|
else:
|
|
print_to_stderr(READLINE_UNAVAILABLE_ERROR)
|
|
|
|
def do_rerun(self, args):
|
|
"""Rerun a command with an command index in history
|
|
Example: @1;
|
|
"""
|
|
history_len = self.readline.get_current_history_length()
|
|
# Rerun command shouldn't appear in history
|
|
self.readline.remove_history_item(history_len - 1)
|
|
history_len -= 1
|
|
if not self.readline:
|
|
print_to_stderr(READLINE_UNAVAILABLE_ERROR)
|
|
return CmdStatus.ERROR
|
|
try:
|
|
cmd_idx = int(args)
|
|
except ValueError:
|
|
print_to_stderr("Command index to be rerun must be an integer.")
|
|
return CmdStatus.ERROR
|
|
if not (0 < cmd_idx <= history_len or -history_len <= cmd_idx < 0):
|
|
print_to_stderr("Command index out of range. Valid range: [1, {0}] and [-{0}, -1]"
|
|
.format(history_len))
|
|
return CmdStatus.ERROR
|
|
if cmd_idx < 0:
|
|
cmd_idx += history_len + 1
|
|
cmd = self.readline.get_history_item(cmd_idx)
|
|
print_to_stderr("Rerunning " + cmd)
|
|
return self.onecmd(cmd.rstrip(";"))
|
|
|
|
def do_tip(self, args):
|
|
"""Print a random tip"""
|
|
print_to_stderr(random.choice(TIPS))
|
|
|
|
def do_src(self, args):
|
|
return self.do_source(args)
|
|
|
|
def do_source(self, args):
|
|
try:
|
|
cmd_file = open(args, "r")
|
|
except Exception, e:
|
|
print_to_stderr("Error opening file '%s': %s" % (args, e))
|
|
return CmdStatus.ERROR
|
|
if self.execute_query_list(parse_query_text(cmd_file.read())):
|
|
return CmdStatus.SUCCESS
|
|
else:
|
|
return CmdStatus.ERROR
|
|
|
|
def preloop(self):
|
|
"""Load the history file if it exists"""
|
|
if self.readline:
|
|
# The history file is created when the Impala shell is invoked and commands are
|
|
# issued. In the first invocation of the shell, the history file will not exist.
|
|
# Clearly, this is not an error, return.
|
|
if not os.path.exists(self.history_file): return
|
|
try:
|
|
self.readline.read_history_file(self.history_file)
|
|
self._replace_history_delimiters(ImpalaShell.HISTORY_FILE_QUERY_DELIM, '\n')
|
|
except IOError, i:
|
|
msg = "Unable to load command history (disabling history collection): %s" % i
|
|
print_to_stderr(msg)
|
|
# This history file exists but is not readable, disable readline.
|
|
self._disable_readline()
|
|
|
|
def postloop(self):
|
|
"""Save session commands in history."""
|
|
if self.readline:
|
|
try:
|
|
self._replace_history_delimiters('\n', ImpalaShell.HISTORY_FILE_QUERY_DELIM)
|
|
self.readline.write_history_file(self.history_file)
|
|
except IOError, i:
|
|
msg = "Unable to save command history (disabling history collection): %s" % i
|
|
print_to_stderr(msg)
|
|
# The history file is not writable, disable readline.
|
|
self._disable_readline()
|
|
|
|
def parseline(self, line):
|
|
"""Parse the line into a command name and a string containing
|
|
the arguments. Returns a tuple containing (command, args, line).
|
|
'command' and 'args' may be None if the line couldn't be parsed.
|
|
'line' in return tuple is the rewritten original line, with leading
|
|
and trailing space removed and special characters transformed into
|
|
their aliases.
|
|
"""
|
|
line = line.strip()
|
|
if line and line[0] == '@':
|
|
line = 'rerun ' + line[1:]
|
|
return super(ImpalaShell, self).parseline(line)
|
|
|
|
|
|
def _replace_history_delimiters(self, src_delim, tgt_delim):
|
|
"""Replaces source_delim with target_delim for all items in history.
|
|
|
|
Read all the items from history into a local list. Clear the history and copy them
|
|
back after doing the transformation.
|
|
"""
|
|
history_len = self.readline.get_current_history_length()
|
|
# load the history and replace the shell's delimiter with EOL
|
|
history_items = map(self.readline.get_history_item, xrange(1, history_len + 1))
|
|
history_items = [item.replace(src_delim, tgt_delim) for item in history_items]
|
|
# Clear the original history and replace it with the mutated history.
|
|
self.readline.clear_history()
|
|
for history_item in history_items:
|
|
self.readline.add_history(history_item)
|
|
|
|
def default(self, args):
|
|
query = self.imp_client.create_beeswax_query(args, self.set_query_options)
|
|
return self._execute_stmt(query, print_web_link=True)
|
|
|
|
def emptyline(self):
|
|
"""If an empty line is entered, do nothing"""
|
|
|
|
def do_version(self, args):
|
|
"""Prints the Impala build version"""
|
|
print_to_stderr("Shell version: %s" % VERSION_STRING)
|
|
print_to_stderr("Server version: %s" % self.server_version)
|
|
|
|
def completenames(self, text, *ignored):
|
|
"""Make tab completion of commands case agnostic
|
|
|
|
Override the superclass's completenames() method to support tab completion for
|
|
upper case and mixed case commands.
|
|
"""
|
|
cmd_names = [cmd for cmd in self.commands if cmd.startswith(text.lower())]
|
|
# If the user input is upper case, return commands in upper case.
|
|
if text.isupper(): return [cmd_names.upper() for cmd_names in cmd_names]
|
|
# If the user input is lower case or mixed case, return lower case commands.
|
|
return cmd_names
|
|
|
|
def execute_query_list(self, queries):
|
|
if not self.imp_client.connected:
|
|
print_to_stderr('Not connected to Impala, could not execute queries.')
|
|
return False
|
|
queries = [self.sanitise_input(q) for q in queries]
|
|
for q in queries:
|
|
if self.onecmd(q) is CmdStatus.ERROR:
|
|
print_to_stderr('Could not execute command: %s' % q)
|
|
if not self.ignore_query_failure: return False
|
|
return True
|
|
|
|
|
|
TIPS=[
|
|
"Press TAB twice to see a list of available commands.",
|
|
"After running a query, type SUMMARY to see a summary of where time was spent.",
|
|
"The SET command shows the current value of all shell and query options.",
|
|
"To see live updates on a query's progress, run 'set LIVE_SUMMARY=1;'.",
|
|
"To see a summary of a query's progress that updates in real-time, run 'set \
|
|
LIVE_PROGRESS=1;'.",
|
|
"The HISTORY command lists all shell commands in chronological order.",
|
|
"The '-B' command line flag turns off pretty-printing for query results. Use this flag \
|
|
to remove formatting from results you want to save for later, or to benchmark Impala.",
|
|
"You can run a single query from the command line using the '-q' option.",
|
|
"When pretty-printing is disabled, you can use the '--output_delimiter' flag to set \
|
|
the delimiter for fields in the same row. The default is ','.",
|
|
"Run the PROFILE command after a query has finished to see a comprehensive summary of \
|
|
all the performance and diagnostic information that Impala gathered for that query. Be \
|
|
warned, it can be very long!",
|
|
"To see more tips, run the TIP command.",
|
|
"Every command must be terminated by a ';'.",
|
|
"Want to know what version of Impala you're connected to? Run the VERSION command to \
|
|
find out!",
|
|
"You can change the Impala daemon that you're connected to by using the CONNECT \
|
|
command."
|
|
"To see how Impala will plan to run your query without actually executing it, use the \
|
|
EXPLAIN command. You can change the level of detail in the EXPLAIN output by setting the \
|
|
EXPLAIN_LEVEL query option.",
|
|
"When you set a query option it lasts for the duration of the Impala shell session."
|
|
]
|
|
|
|
HEADER_DIVIDER =\
|
|
"***********************************************************************************"
|
|
|
|
def _format_tip(tip):
|
|
"""Takes a tip string and splits it on word boundaries so that it fits neatly inside the
|
|
shell header."""
|
|
return '\n'.join([l for l in textwrap.wrap(tip, len(HEADER_DIVIDER))])
|
|
|
|
WELCOME_STRING = """\
|
|
***********************************************************************************
|
|
Welcome to the Impala shell.
|
|
(%s)
|
|
|
|
%s
|
|
***********************************************************************************\
|
|
""" \
|
|
% (VERSION_STRING, _format_tip(random.choice(TIPS)))
|
|
|
|
REFRESH_AFTER_CONNECT_DEPRECATION_WARNING = """
|
|
+==========================================================================+
|
|
| DEPRECATION WARNING: |
|
|
| -r/--refresh_after_connect is deprecated and will be removed in a future |
|
|
| version of Impala shell. |
|
|
+==========================================================================+"""
|
|
|
|
def print_to_stderr(message):
|
|
print >> sys.stderr, message
|
|
|
|
def parse_query_text(query_text, utf8_encode_policy='strict'):
|
|
"""Parse query file text to extract queries and encode into utf-8"""
|
|
query_list = [q.encode('utf-8', utf8_encode_policy) for q in sqlparse.split(query_text)]
|
|
# Remove trailing comments in the input, if any. We do this because sqlparse splits the
|
|
# input at query boundaries and associates the query only with preceding comments
|
|
# (following comments are associated with the next query). This is a problem with
|
|
# trailing comments. For example, consider the following input:
|
|
# -------------
|
|
# -- comment1
|
|
# select 1;
|
|
# -- comment2
|
|
# -------------
|
|
# When sqlparse splits the query, "comment1" is associated with the query "select 1" and
|
|
# "--comment2" is sent as is. Impala's parser however doesn't consider it a valid SQL
|
|
# and throws an exception. We identify such trailing comments and ignore them (do not
|
|
# send them to Impala).
|
|
if query_list and not sqlparse.format(query_list[-1], strip_comments=True).strip("\n"):
|
|
query_list.pop()
|
|
return query_list
|
|
|
|
def parse_variables(keyvals):
|
|
"""Parse variable assignments passed as arguments in the command line"""
|
|
kv_pattern = r'(%s)=(.*)$' % (ImpalaShell.VALID_VAR_NAME_PATTERN,)
|
|
vars = {}
|
|
if keyvals:
|
|
for keyval in keyvals:
|
|
match = re.match(kv_pattern, keyval)
|
|
if not match:
|
|
print_to_stderr('Error: Could not parse key-value "%s". ' % (keyval,) +
|
|
'It must follow the pattern "KEY=VALUE".')
|
|
parser.print_help()
|
|
sys.exit(1)
|
|
else:
|
|
vars[match.groups()[0].upper()] = match.groups()[1]
|
|
return vars
|
|
|
|
def execute_queries_non_interactive_mode(options, query_options):
|
|
"""Run queries in non-interactive mode."""
|
|
if options.query_file:
|
|
try:
|
|
# "-" here signifies input from STDIN
|
|
if options.query_file == "-":
|
|
query_file_handle = sys.stdin
|
|
else:
|
|
query_file_handle = open(options.query_file, 'r')
|
|
except Exception, e:
|
|
print_to_stderr("Could not open file '%s': %s" % (options.query_file, e))
|
|
sys.exit(1)
|
|
|
|
query_text = query_file_handle.read()
|
|
elif options.query:
|
|
query_text = options.query
|
|
else:
|
|
return
|
|
|
|
queries = parse_query_text(query_text)
|
|
shell = ImpalaShell(options, query_options)
|
|
if not (shell.execute_query_list(shell.cmdqueue) and
|
|
shell.execute_query_list(queries)):
|
|
sys.exit(1)
|
|
|
|
def get_intro(options):
|
|
"""Get introduction message for start-up. The last character should not be a return."""
|
|
if not options.verbose:
|
|
return ""
|
|
|
|
intro = WELCOME_STRING
|
|
|
|
if not options.ssl and options.creds_ok_in_clear and options.use_ldap:
|
|
intro += ("\n\nLDAP authentication is enabled, but the connection to Impala is "
|
|
"not secured by TLS.\nALL PASSWORDS WILL BE SENT IN THE CLEAR TO IMPALA.")
|
|
|
|
if options.refresh_after_connect:
|
|
intro += '\n'.join(REFRESH_AFTER_CONNECT_DEPRECATION_WARNING)
|
|
return intro
|
|
|
|
if __name__ == "__main__":
|
|
"""
|
|
There are two types of options: shell options and query_options. Both can be set in the
|
|
command line, which override the options set in config file (.impalarc). The default
|
|
shell options come from impala_shell_config_defaults.py. Query options have no defaults
|
|
within the impala-shell, but they do have defaults on the server. Query options can be
|
|
also changed in impala-shell with the 'set' command.
|
|
"""
|
|
# pass defaults into option parser
|
|
parser = get_option_parser(impala_shell_defaults)
|
|
options, args = parser.parse_args()
|
|
# use path to file specified by user in config_file option
|
|
user_config = os.path.expanduser(options.config_file);
|
|
# by default, use the .impalarc in the home directory
|
|
config_to_load = impala_shell_defaults.get("config_file")
|
|
# verify user_config, if found
|
|
if os.path.isfile(user_config) and user_config != config_to_load:
|
|
if options.verbose:
|
|
print_to_stderr("Loading in options from config file: %s \n" % user_config)
|
|
# Command line overrides loading ~/.impalarc
|
|
config_to_load = user_config
|
|
elif user_config != config_to_load:
|
|
print_to_stderr('%s not found.\n' % user_config)
|
|
sys.exit(1)
|
|
|
|
query_options = {}
|
|
|
|
# default shell options loaded in from impala_shell_config_defaults.py
|
|
# options defaults overwritten by those in config file
|
|
try:
|
|
loaded_shell_options, query_options = get_config_from_file(config_to_load)
|
|
impala_shell_defaults.update(loaded_shell_options)
|
|
except Exception, e:
|
|
print_to_stderr(e)
|
|
sys.exit(1)
|
|
|
|
parser = get_option_parser(impala_shell_defaults)
|
|
options, args = parser.parse_args()
|
|
|
|
# Arguments that could not be parsed are stored in args. Print an error and exit.
|
|
if len(args) > 0:
|
|
print_to_stderr('Error, could not parse arguments "%s"' % (' ').join(args))
|
|
parser.print_help()
|
|
sys.exit(1)
|
|
|
|
if options.version:
|
|
print VERSION_STRING
|
|
sys.exit(0)
|
|
|
|
if options.use_kerberos and options.use_ldap:
|
|
print_to_stderr("Please specify at most one authentication mechanism (-k or -l)")
|
|
sys.exit(1)
|
|
|
|
if not options.ssl and not options.creds_ok_in_clear and options.use_ldap:
|
|
print_to_stderr("LDAP credentials may not be sent over insecure " +
|
|
"connections. Enable SSL or set --auth_creds_ok_in_clear")
|
|
sys.exit(1)
|
|
|
|
if not options.use_ldap and options.ldap_password_cmd:
|
|
print_to_stderr("Option --ldap_password_cmd requires using LDAP authentication " +
|
|
"mechanism (-l)")
|
|
sys.exit(1)
|
|
|
|
if options.use_kerberos:
|
|
if options.verbose:
|
|
print_to_stderr("Starting Impala Shell using Kerberos authentication")
|
|
print_to_stderr("Using service name '%s'" % options.kerberos_service_name)
|
|
# Check if the user has a ticket in the credentials cache
|
|
try:
|
|
if call(['klist', '-s']) != 0:
|
|
print_to_stderr(("-k requires a valid kerberos ticket but no valid kerberos "
|
|
"ticket found."))
|
|
sys.exit(1)
|
|
except OSError, e:
|
|
print_to_stderr('klist not found on the system, install kerberos clients')
|
|
sys.exit(1)
|
|
elif options.use_ldap:
|
|
if options.verbose:
|
|
print_to_stderr("Starting Impala Shell using LDAP-based authentication")
|
|
else:
|
|
if options.verbose:
|
|
print_to_stderr("Starting Impala Shell without Kerberos authentication")
|
|
|
|
options.ldap_password = None
|
|
if options.use_ldap and options.ldap_password_cmd:
|
|
try:
|
|
p = subprocess.Popen(shlex.split(options.ldap_password_cmd), stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
options.ldap_password, stderr = p.communicate()
|
|
if p.returncode != 0:
|
|
print_to_stderr("Error retrieving LDAP password (command was '%s', error was: "
|
|
"'%s')" % (options.ldap_password_cmd, stderr.strip()))
|
|
sys.exit(1)
|
|
except Exception, e:
|
|
print_to_stderr("Error retrieving LDAP password (command was: '%s', exception "
|
|
"was: '%s')" % (options.ldap_password_cmd, e))
|
|
sys.exit(1)
|
|
|
|
if options.ssl:
|
|
if options.ca_cert is None:
|
|
if options.verbose:
|
|
print_to_stderr("SSL is enabled. Impala server certificates will NOT be verified"\
|
|
" (set --ca_cert to change)")
|
|
else:
|
|
if options.verbose:
|
|
print_to_stderr("SSL is enabled")
|
|
|
|
if options.output_file:
|
|
try:
|
|
# Make sure the given file can be opened for writing. This will also clear the file
|
|
# if successful.
|
|
open(options.output_file, 'wb')
|
|
except IOError, e:
|
|
print_to_stderr('Error opening output file for writing: %s' % e)
|
|
sys.exit(1)
|
|
|
|
options.variables = parse_variables(options.keyval)
|
|
|
|
# Override query_options from config file with those specified on the command line.
|
|
query_options.update(
|
|
[(k.upper(), v) for k, v in parse_variables(options.query_options).items()])
|
|
|
|
if options.query or options.query_file:
|
|
if options.print_progress or options.print_summary:
|
|
print_to_stderr("Error: Live reporting is available for interactive mode only.")
|
|
sys.exit(1)
|
|
|
|
execute_queries_non_interactive_mode(options, query_options)
|
|
sys.exit(0)
|
|
|
|
intro = get_intro(options)
|
|
|
|
shell = ImpalaShell(options, query_options)
|
|
while shell.is_alive:
|
|
try:
|
|
try:
|
|
shell.cmdloop(intro)
|
|
except KeyboardInterrupt:
|
|
intro = '\n'
|
|
# A last measure against any exceptions thrown by an rpc
|
|
# not caught in the shell
|
|
except socket.error, (code, e):
|
|
# if the socket was interrupted, reconnect the connection with the client
|
|
if code == errno.EINTR:
|
|
print shell.CANCELLATION_MESSAGE
|
|
shell._reconnect_cancellation()
|
|
else:
|
|
print_to_stderr("Socket error %s: %s" % (code, e))
|
|
shell.imp_client.connected = False
|
|
shell.prompt = shell.DISCONNECTED_PROMPT
|
|
except DisconnectedException, e:
|
|
# the client has lost the connection
|
|
print_to_stderr(e)
|
|
shell.imp_client.connected = False
|
|
shell.prompt = shell.DISCONNECTED_PROMPT
|
|
except QueryStateException, e:
|
|
# an exception occurred while executing the query
|
|
shell.imp_client.close_query(shell.last_query_handle,
|
|
shell.query_handle_closed)
|
|
print_to_stderr(e)
|
|
except RPCException, e:
|
|
# could not complete the rpc successfully
|
|
print_to_stderr(e)
|
|
except IOError, e:
|
|
# Interrupted system calls (e.g. because of cancellation) should be ignored.
|
|
if e.errno != errno.EINTR: raise
|
|
finally:
|
|
intro = ''
|