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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14017) Procedure v2 - MasterProcedureQueue fix concurrency issue on table queue deletion
Date Fri, 03 Jul 2015 02:24:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14612766#comment-14612766
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Matteo Bertozzi commented on HBASE-14017:
-----------------------------------------

it does not make any difference, we are under synchronized. we check for isLocked() so that
tryLock will always lock successfully, not the best looking thing ever but correct anyway
[~stack] 

> Procedure v2 - MasterProcedureQueue fix concurrency issue on table queue deletion
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-14017
>                 URL: https://issues.apache.org/jira/browse/HBASE-14017
>             Project: HBase
>          Issue Type: Sub-task
>          Components: proc-v2
>    Affects Versions: 2.0.0, 1.2.0, 1.1.0.1
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>            Priority: Blocker
>             Fix For: 2.0.0, 1.2.0, 1.1.2
>
>         Attachments: HBASE-14017-v0.patch
>
>
> [~syuanjiang] found a concurrecy issue in the procedure queue delete where we don't have
an exclusive lock before deleting the table
> {noformat}
> Thread 1: Create table is running - tryWrite() acquire the lock, before set wlock=true;
> Thread 2: markTableAsDeleted see the queue empty and wlock= false
> Thread 1: set wlock=true; too late
> Thread 2: delete the queue
> Thread 1: never able to release the lock
> {noformat}



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