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From "Naresh P R (Jira)" <j...@apache.org>
Subject [jira] [Work started] (HIVE-23409) If TezSession application reopen fails for Timeline service down, default TezSession from SessionPool is closed after a retry
Date Fri, 08 May 2020 03:53:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HIVE-23409 started by Naresh P R.
-----------------------------------------
> If TezSession application reopen fails for Timeline service down, default TezSession
from SessionPool is closed after a retry
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-23409
>                 URL: https://issues.apache.org/jira/browse/HIVE-23409
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Naresh P R
>            Assignee: Naresh P R
>            Priority: Major
>
> we are closing a default session from TezSessionPool at here.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezTask.java#L589]
> If all the sessions in a pool are destroyed, queries wait indefinitely at TezSessionPool.getSession
until HS2 restarts after other service recoveries.
> [HiveServer2-Background-Pool: Thread-12345]: tez.TezSessionPoolManager (:()) - We are
closing a default session because of retry failure.
> It's better if we allow retry & fail than hung.



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