[jira] [Updated] (HBASE-25505) ZK watcher threads are daemonized; reconsider

["Duo Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-25505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang updated HBASE-25505:
------------------------------
    Attachment: ScheduledChore.cleanup-not-called.diff

> ZK watcher threads are daemonized; reconsider
> ---------------------------------------------
>
>                 Key: HBASE-25505
>                 URL: https://issues.apache.org/jira/browse/HBASE-25505
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Andrew Kyle Purtell
>            Priority: Major
>         Attachments: ScheduledChore.cleanup-not-called.diff
>
>
> On HBASE-25279 there was some discussion and difference of opinion about having ZK watcher pool threads be daemonized. This is not necessarily a problem but should be reconsidered. 
> Daemon threads are subject to abrupt termination during JVM shutdown and therefore may be interrupted before state changes are complete or resources are released. 
> As long as ZK watchers are properly closed by shutdown logic the pool threads will be terminated in a controlled manner and the JVM will exit. 



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