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https://issues.apache.org/jira/browse/HIVE-18160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16269982#comment-16269982
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Prasanth Jayachandran commented on HIVE-18160:
----------------------------------------------
Test failures are unrelated to this patch.
> Jar localization during session initialization is slow
> ------------------------------------------------------
>
> Key: HIVE-18160
> URL: https://issues.apache.org/jira/browse/HIVE-18160
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Fix For: 3.0.0
>
> Attachments: HIVE-18160.1.patch, HIVE-18160.2.patch
>
>
> Same Jar getting localized multiple times resulting in SHA256 computation
> several times causes slow session initialization time.
> {code}
> 2017-11-28T00:40:55,795 INFO [main]: tez.TezSessionState
> (TezSessionState.java:createJarLocalResource(716)) - Computed sha:
> 55aa783d2dda0599fb89a37daae2a2efebf0eed0d4f6e99e3ce140d2fa2f0c30 for file:
> file:/work/hive/hive-git/packaging/target/apache-hive-3.0.0-SNAPSHOT-bin/apache-hive-3.0.0-SNAPSHOT-bin/lib/hive-exec-3.0.0-SNAPSHOT.jar
> of length: 35.68MB in 241 ms
> 2017-11-28T00:40:56,105 INFO [main]: tez.TezSessionState
> (TezSessionState.java:createJarLocalResource(716)) - Computed sha:
> e20986f3a422f8fa5eb61c5a2756cd6f7d2b779dbcab49eae6f2c8dfff7ad2a2 for file:
> file:/work/hive/hive-git/packaging/target/apache-hive-3.0.0-SNAPSHOT-bin/apache-hive-3.0.0-SNAPSHOT-bin/lib/hive-llap-tez-3.0.0-SNAPSHOT.jar
> of length: 109.53KB in 1 ms
> 2017-11-28T00:40:56,353 INFO [main]: tez.TezSessionState
> (TezSessionState.java:createJarLocalResource(716)) - Computed sha:
> 55aa783d2dda0599fb89a37daae2a2efebf0eed0d4f6e99e3ce140d2fa2f0c30 for file:
> file:/work/hive/hive-git/packaging/target/apache-hive-3.0.0-SNAPSHOT-bin/apache-hive-3.0.0-SNAPSHOT-bin/lib/hive-exec-3.0.0-SNAPSHOT.jar
> of length: 35.68MB in 231 ms
> 2017-11-28T00:40:56,602 INFO [main]: tez.TezSessionState
> (TezSessionState.java:createJarLocalResource(716)) - Computed sha:
> 55aa783d2dda0599fb89a37daae2a2efebf0eed0d4f6e99e3ce140d2fa2f0c30 for file:
> file:/work/hive/hive-git/packaging/target/apache-hive-3.0.0-SNAPSHOT-bin/apache-hive-3.0.0-SNAPSHOT-bin/lib/hive-exec-3.0.0-SNAPSHOT.jar
> of length: 35.68MB in 241 ms
> 2017-11-28T00:40:56,612 INFO [main]: tez.TezSessionState
> (TezSessionState.java:createJarLocalResource(716)) - Computed sha:
> 686d66b825fdc4fc241e0591e7646a1bbca1c7114a7224c41da7f4795cf9477a for file:
> file:/work/hadoop/hadoop/hadoop-dist/target/hadoop-2.9.0-SNAPSHOT/share/hadoop/yarn/hadoop-yarn-registry-2.9.0-SNAPSHOT.jar
> of length: 122.72KB in 2 ms
> {code}
> From above logs, sha256 is computed 3 times for hive-exec jar and each
> invocation takes around 240ms.
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