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https://issues.apache.org/jira/browse/HBASE-25279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264527#comment-17264527
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Lars Hofhansl commented on HBASE-25279:
---------------------------------------
I just came across this as well.
Currently my 2.4.1 the HMaster still hangs upon shutdown. When I annotated the
thread names with the identifier of the ZKWatcher owning that pool I see it's
on behalf of the ReplicationLogCleaner. Following the life-cycle of
HFileLogCleaner, CleanerChore, and ScheduledChore I can't find anything
obviously wrong. (If you called setConf more than once the previous ZKWatcher
would not get closed, but that turned out to be not the problem.)
[~apurtell] also tried to reproduce but he could not reproduce.
[~elserj], [~vjasani] are you still seeing this problem?
> Non-daemon thread in ZKWatcher
> ------------------------------
>
> Key: HBASE-25279
> URL: https://issues.apache.org/jira/browse/HBASE-25279
> Project: HBase
> Issue Type: Bug
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Critical
> Fix For: 3.0.0-alpha-1, 2.4.1
>
>
> ZKWatcher spawns an ExecutorService which doesn't mark its threads as daemons
> which will prevent clean shut downs.
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