[jira] [Assigned] (HIVE-26903) Compactor threads should gracefully shutdown

["László Végh (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-26903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

László Végh reassigned HIVE-26903:
----------------------------------

    Assignee: László Végh

> Compactor threads should gracefully shutdown
> --------------------------------------------
>
>                 Key: HIVE-26903
>                 URL: https://issues.apache.org/jira/browse/HIVE-26903
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: László Végh
>            Assignee: László Végh
>            Priority: Major
>
> Currently the compactor threads are daemon threads, which means the JVM will not wait for these threads to finish. (see: [https://github.com/apache/hive/blob/431e7d9e5431a808106d8db81e11aea74f040da5/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactorThread.java#L81)] As a result during system shutdown, JVM may close all daemon threads abruptly (JVM won't wait for a thread to sleep/wait, and no InterruptedException is thrown), so the threads don't have any chance to shutdown gracefully. This can lead to inconsistent/corrupted state in the Metastore or on the File system.
> Make the compactor threads user threads, and handle shutdown accordingly. Make sure interrupts and InterruptedException is handled accordingly.



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