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https://issues.apache.org/jira/browse/HBASE-2447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859078#action_12859078
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stack commented on HBASE-2447:
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I like the STOP/CONT trick. I'm trying it to see if I can get into same
state...
> LogSyncer.addToSyncQueue doesn't check if syncer is still running before
> waiting
> --------------------------------------------------------------------------------
>
> Key: HBASE-2447
> URL: https://issues.apache.org/jira/browse/HBASE-2447
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: hbase-2447.txt
>
>
> In testing GC pause scenarios with kill -STOP, I got the regionserver into a
> situation where it was blocked forever while shutting down (also blocking
> clients, since the RPCs were still pinging). The root issue is that, if the
> log syncer has an error just as more edits are being done, addToSyncQueue()
> can go to sleep waiting on a syncer which has just died.
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