[jira] [Commented] (IMPALA-11232) Consider not adding some jars when starting HMS

["ASF subversion and git services (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-11232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521943#comment-17521943 ] 

ASF subversion and git services commented on IMPALA-11232:
----------------------------------------------------------

Commit c190966db932cf7b24881ce2213fd6f7d9192099 in impala's branch refs/heads/master from Fang-Yu Rao
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=c190966db ]

IMPALA-11232: Do not add some jars to HADOOP_CLASSPATH when starting HMS

This patch changes the line that added to HADOOP_CLASSPATH all the jar
files in the folder ${RANGER_HOME}/ews/webapp/WEB-INF/lib to a line that
only includes those jar files with names starting with "ranger-" since
almost all other jar files do not seem to be necessary to run the E2E
test of test_hive_with_ranger_setup.

This way we also avoid adding too many paths to HADOOP_CLASSPATH, which
in turn could result in Hadoop not being able to return its version to
the script that starts HMS due to the error of "Argument list too long".

Testing:
 - Verified after this patch, test_hive_with_ranger_setup still
   succeeds.
 - Verified in a local development environment that the length of
   Hadoop's environment variable 'CLASSPATH' logged in
   hive-metastore.out decreases from 100,876 characters to 62,634
   characters when executing run-hive-server.sh with the flag
   '-with_ranger' if $HADOOP_SHELL_SCRIPT_DEBUG is "true" and
   $IMPALA_HOME is "/home/fangyurao/Impala_for_FE".

Change-Id: Ifd66fd99a346835b9f81f95b5f046273fcce2590
Reviewed-on: http://gerrit.cloudera.org:8080/18398
Reviewed-by: Impala Public Jenkins <im...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>


> Consider not adding some jars when starting HMS
> -----------------------------------------------
>
>                 Key: IMPALA-11232
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11232
>             Project: IMPALA
>          Issue Type: Test
>          Components: Infrastructure
>    Affects Versions: Impala 4.0.0
>            Reporter: Fang-Yu Rao
>            Assignee: Fang-Yu Rao
>            Priority: Minor
>
> Currently when we execute {{run-hive-server.sh}} with the "{{-with_ranger}}" flag, we add all the jar files under the folder of {{$RANGER_HOME/ews/webapp/WEB-INF/lib}} to '{{HADOOP_CLASSPATH}}' before we call the shell script that starts the Hive service, i.e., {{bin/hive}}.
> Recall that {{bin/hive}} would attempt to execute '{{hadoop version}}' to determine the version of the underlying Hadoop distribution before starting the Hive Metastore and the HiveServer2. By default, this Hadoop command under the covers would add every path on '{{HADOOP_CLASSPATH}}' to its own environment variable of '{{CLASSPATH}}'. When there are too many paths added to '{{CLASSPATH}}', the Hadoop command would fail with the error message of "{{Argument list too long.}}" and hence the Hive service could not be started.
> We execute {{run-hive-server.sh}} with the "{{-with_ranger}}" flag in order to run the end-to-end test of {{test_hive_with_ranger_setup}}. We should consider not adding some (or all) of the jar files to '{{HADOOP_CLASSPATH}}' from the folder described if some (or all) of them are not required to run the end-to-end test so as to avoid the error mentioned above.



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