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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21563) Improve Table#getEmptyTable performance by disable registerAllFunctionsOnce
Date Tue, 02 Apr 2019 18:30:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808002#comment-16808002
] 

Sergey Shelukhin commented on HIVE-21563:
-----------------------------------------

Hmm.. what are the side effects of this behavior? It looks like it would affect other methods.

> Improve Table#getEmptyTable performance by disable registerAllFunctionsOnce
> ---------------------------------------------------------------------------
>
>                 Key: HIVE-21563
>                 URL: https://issues.apache.org/jira/browse/HIVE-21563
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Yuming Wang
>            Assignee: Yuming Wang
>            Priority: Major
>         Attachments: HIVE-21563.001.patch
>
>
> We do not need registerAllFunctionsOnce when {{Table#getEmptyTable}}. The stack trace:
> {noformat}
>   at org.apache.hadoop.hive.ql.exec.Registry.registerGenericUDF(Registry.java:177)
>   at org.apache.hadoop.hive.ql.exec.Registry.registerGenericUDF(Registry.java:170)
>   at org.apache.hadoop.hive.ql.exec.FunctionRegistry.<clinit>(FunctionRegistry.java:209)
>   at org.apache.hadoop.hive.ql.metadata.Hive.reloadFunctions(Hive.java:247)
>   at org.apache.hadoop.hive.ql.metadata.Hive.registerAllFunctionsOnce(Hive.java:231)
>   at org.apache.hadoop.hive.ql.metadata.Hive.<init>(Hive.java:388)
>   at org.apache.hadoop.hive.ql.metadata.Hive.create(Hive.java:332)
>   at org.apache.hadoop.hive.ql.metadata.Hive.getInternal(Hive.java:312)
>   at org.apache.hadoop.hive.ql.metadata.Hive.get(Hive.java:288)
>   at org.apache.hadoop.hive.ql.session.SessionState.setAuthorizerV2Config(SessionState.java:913)
>   at org.apache.hadoop.hive.ql.session.SessionState.setupAuth(SessionState.java:877)
>   at org.apache.hadoop.hive.ql.session.SessionState.getAuthenticator(SessionState.java:1479)
>   at org.apache.hadoop.hive.ql.session.SessionState.getUserFromAuthenticator(SessionState.java:1150)
>   at org.apache.hadoop.hive.ql.metadata.Table.getEmptyTable(Table.java:180)
> {noformat}



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