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Date: Fri, 3 Jul 2015 16:26:04 +0000 (UTC)
From: "Stephen Yuan Jiang (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12842477.1435884096000.94717.1435940764776@Atlassian.JIRA>
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Subject: [jira] [Commented] (HBASE-14017) Procedure v2 -
 MasterProcedureQueue fix concurrency issue on table queue deletion
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    [ https://issues.apache.org/jira/browse/HBASE-14017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14613288#comment-14613288 ] 

Stephen Yuan Jiang commented on HBASE-14017:
--------------------------------------------

I am not sure why Jenkins not running on the patch in master.  Attach the patch for branch-1.1 (I am tested with the new added UT; without patch, repro consistently; with patch, problem disappeared) and try to re-trigger the Jenkins job.

> 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 - the queue is empty and wlock is false 
> Thread 2: markTableAsDeleted see the queue empty and wlock= false
> Thread 1: tryWrite() set wlock=true; too late
> Thread 2: delete the queue
> Thread 1: never able to release the lock - NPE when trying to get the queue
> {noformat}


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