3fd6f60b22
The 'Expect: 100-continue' http header allows http clients to send only the headers for their request, get a confirmation back from the server that the headers are valid, and only then send the body of the request, avoiding the overhead of sending large requests that will ultimately fail. This patch adds support for this in the HS2 HTTP server by having THttpServer look for the header, and if it's present and the request is validated returning a '100 Continue' response before reading the body of the request. It also adds supports for using this header on large requests sent by impala-shell. Testing: - This case is covered by the existing test_large_sql, however that test was previously broken and passing spuriously. This patch fixes the test. - Passed all other shell tests. Change-Id: I4153968551acd58b25c7923c2ebf75ee29a7e76b Reviewed-on: http://gerrit.cloudera.org:8080/15284 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Thomas Tauber-Marshall <tmarshall@cloudera.com>
Impala Interactive Shell
You can use the Impala shell tool (impala-shell) to connect to an Impala service. The shell allows you to set up databases and tables, insert data, and issue queries. For ad hoc queries and exploration, you can submit SQL statements in an interactive session. The impala-shell interpreter accepts all the same SQL statements listed in Impala SQL Statements, plus some shell-only commands that you can use for tuning performance and diagnosing problems.
To automate your work, you can specify command-line options to process a single statement or a script file. (Other avenues for Impala automation via python are provided by Impyla or ODBC.)
Installing
$ pip install impala-shell
Online documentation
Quickstart
Non-interactive mode
Processing a single query, e.g., show tables:
$ impala-shell -i impalad-host.domain.com -d some_database -q 'show tables'
Processing a text file with a series of queries:
$ impala-shell -i impalad-host.domain.com -d some_database -f /path/to/queries.sql
Launching the interactive shell
To connect to an impalad host at the default service port (21000):
$ impala-shell -i impalad-host.domain.com
Starting Impala Shell without Kerberos authentication
Connected to impalad-host.domain.com:21000
Server version: impalad version 2.11.0-SNAPSHOT RELEASE (build d4596f9ca3ea32a8008cdc809a7ac9a3dea47962)
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Welcome to the Impala shell.
(Impala Shell v3.0.0-SNAPSHOT (73e90d2) built on Thu Mar 8 00:59:00 PST 2018)
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.
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[impalad-host.domain.com:21000] >
Launching the interactive shell (secure mode)
To connect to a secure host using kerberos and SSL:
$ impala-shell -k --ssl -i impalad-secure-host.domain.com
Disconnecting
To exit the shell when running interactively, press Ctrl-D at the shell prompt.