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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2447) LogSyncer.addToSyncQueue doesn't check if syncer is still running before waiting
Date Tue, 20 Apr 2010 21:51:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859078#action_12859078
] 

stack commented on HBASE-2447:
------------------------------

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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