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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-2964) Deadlock when RS tries to RPC to itself inside SplitTransaction
Date Wed, 08 Sep 2010 16:59:33 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack resolved HBASE-2964.

     Hadoop Flags: [Reviewed]
    Fix Version/s: 0.90.0
       Resolution: Fixed

Thanks for review and for testing Todd (applied to TRUNK and to 0.89.20100830 branch.

> Deadlock when RS tries to RPC to itself inside SplitTransaction
> ---------------------------------------------------------------
>                 Key: HBASE-2964
>                 URL: https://issues.apache.org/jira/browse/HBASE-2964
>             Project: HBase
>          Issue Type: Bug
>          Components: ipc, regionserver
>    Affects Versions: 0.90.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.90.0
>         Attachments: hbase-2964.txt
> In testing the 0.89.20100830 rc, I ran into a deadlock with the following situation:
> - All of the IPC Handler threads are blocked on the region lock, which is held by CompactSplitThread.
> - CompactSplitThread is in the process of trying to edit META to create the offline parent.
META happens to be on the same server as is executing the split.
> Therefore, the CompactSplitThread is trying to connect back to itself, but all of the
handler threads are blocked, so the IPC never happens. Thus, the entire RS gets deadlocked.

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