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82bd087fb1
This takes steps to make Python 2 behave like Python 3 as
a way to flush out issues with running on Python 3. Specifically,
it handles two main differences:
1. Python 3 requires absolute imports within packages. This
can be emulated via "from __future__ import absolute_import"
2. Python 3 changed division to "true" division that doesn't
round to an integer. This can be emulated via
"from __future__ import division"
This changes all Python files to add imports for absolute_import
and division. For completeness, this also includes print_function in the
import.
I scrutinized each old-division location and converted some locations
to use the integer division '//' operator if it needed an integer
result (e.g. for indices, counts of records, etc). Some code was also using
relative imports and needed to be adjusted to handle absolute_import.
This fixes all Pylint warnings about no-absolute-import and old-division,
and these warnings are now banned.
Testing:
- Ran core tests
Change-Id: Idb0fcbd11f3e8791f5951c4944be44fb580e576b
Reviewed-on: http://gerrit.cloudera.org:8080/19588
Reviewed-by: Joe McDonnell <joemcdonnell@cloudera.com>
Tested-by: Joe McDonnell <joemcdonnell@cloudera.com>
120 lines
4.3 KiB
Python
120 lines
4.3 KiB
Python
# 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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# Utility functions related to executing shell commands.
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from __future__ import absolute_import, division, print_function
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import logging
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import os
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import shlex
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from select import select
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from subprocess import PIPE, Popen, STDOUT, call
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from textwrap import dedent
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from time import sleep, time
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from tests.common.errors import Timeout
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LOG = logging.getLogger('shell_util')
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def dump_server_stacktraces():
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LOG.debug('Dumping stacktraces of running servers')
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call([os.path.join(os.environ['IMPALA_HOME'], "bin/dump-stacktraces.sh")])
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def exec_process(cmd):
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"""Executes a subprocess, waiting for completion. The process exit code, stdout and
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stderr are returned as a tuple."""
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LOG.debug('Executing: %s' % (cmd,))
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# Popen needs a list as its first parameter. The first element is the command,
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# with the rest being arguments.
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p = exec_process_async(cmd)
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stdout, stderr = p.communicate()
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rc = p.returncode
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return rc, stdout, stderr
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def exec_process_async(cmd):
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"""Executes a subprocess, returning immediately. The process object is returned for
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later retrieval of the exit code etc. """
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LOG.debug('Executing: %s' % (cmd,))
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# Popen needs a list as its first parameter. The first element is the command,
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# with the rest being arguments.
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return Popen(shlex.split(cmd), shell=False, stdout=PIPE, stderr=PIPE)
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def shell(cmd, cmd_prepend="set -euo pipefail\n", stdout=PIPE, stderr=STDOUT,
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timeout_secs=None, **popen_kwargs):
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"""Executes a command and returns its output. If the command's return code is non-zero
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or the command times out, an exception is raised.
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"""
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cmd = dedent(cmd.strip())
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if cmd_prepend:
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cmd = cmd_prepend + cmd
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LOG.debug("Running command with %s timeout: %s" % (
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"no" if timeout_secs is None else ("%s second" % timeout_secs), cmd))
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process = Popen(cmd, shell=True, executable="/bin/bash", stdout=stdout, stderr=stderr,
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**popen_kwargs)
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stdout_fileno = process.stdout and process.stdout.fileno()
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stderr_fileno = process.stderr and process.stderr.fileno()
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remaining_fds = list()
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if stdout_fileno is not None:
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remaining_fds.append(stdout_fileno)
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if stderr_fileno is not None:
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remaining_fds.append(stderr_fileno)
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stdout = list()
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stderr = list()
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def _read_available_output():
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while True:
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available_fds, _, _ = select(remaining_fds, [], [], 0)
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if not available_fds:
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return
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for fd in available_fds:
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data = os.read(fd, 4096)
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if fd == stdout_fileno:
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if not data:
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del remaining_fds[0]
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else:
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stdout.append(data)
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elif fd == stderr_fileno:
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if not data:
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del remaining_fds[-1]
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else:
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stderr.append(data)
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deadline = time() + timeout_secs if timeout_secs is not None else None
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while True:
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# The subprocess docs indicate that stdout/err need to be drained while waiting
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# if the PIPE option is used.
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_read_available_output()
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retcode = process.poll()
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if retcode is not None or (deadline and time() > deadline):
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break
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sleep(0.1)
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_read_available_output()
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output = "".join(stdout)
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if retcode == 0:
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return output
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if not output:
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output = "(No stdout)"
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err = "".join(stderr) if stderr else "(No stderr)"
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if retcode is None:
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raise Timeout("Command timed out after %s seconds\ncmd: %s\nstdout: %s\nstderr: %s"
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% (timeout_secs, cmd, output, err))
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raise Exception(("Command returned non-zero exit code: %s"
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"\ncmd: %s\nstdout: %s\nstderr: %s") % (retcode, cmd, output, err))
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