[jira] [Updated] (HIVE-23458) Introduce unified thread pool for scheduled jobs

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-23458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stamatis Zampetakis updated HIVE-23458:
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    Fix Version/s:     (was: 4.0.0)

I cleared the fixVersion field since this ticket is not resolved. Please review this ticket and if the fix is already committed to a specific version please set the version accordingly and mark the ticket as RESOLVED.

According to the JIRA guidelines (https://cwiki.apache.org/confluence/display/Hive/HowToContribute) the fixVersion should be set only when the issue is resolved/closed.

> Introduce unified thread pool for scheduled jobs
> ------------------------------------------------
>
>                 Key: HIVE-23458
>                 URL: https://issues.apache.org/jira/browse/HIVE-23458
>             Project: Hive
>          Issue Type: Improvement
>          Components: HiveServer2
>            Reporter: Eugene Chung
>            Assignee: Eugene Chung
>            Priority: Major
>              Labels: pull-request-available, todoc4.0
>         Attachments: HIVE-23458.01.patch, HIVE-23458.02.patch, HIVE-23458.03.patch
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> As I mentioned in [the comment of HIVE-23164|https://issues.apache.org/jira/browse/HIVE-23164?focusedCommentId=17089506&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17089506], I've made the unified scheduled executor service like org.apache.hadoop.hive.metastore.ThreadPool.
> I think it could help
> 1. to minimize the possibility of making non-daemon threads when developers need ScheduledExecutorService
> 2. to achieve the utilization of server resources because the current situation is all of the modules make its own ScheduledExecutorService and all of the threads are just using for one job. 
> 3. administrators of Hive servers by providing hive.exec.scheduler.num.threads configuration so that they can predict and set how many threads are used and needed.



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