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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2964) Deadlock when RS tries to RPC to itself inside SplitTransaction
Date Wed, 08 Sep 2010 01:39:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907052#action_12907052
] 

HBase Review Board commented on HBASE-2964:
-------------------------------------------

Message from: "Todd Lipcon" <todd@cloudera.com>

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Seems to make sense. Let me try it on a cluster before I +1 it


src/main/java/org/apache/hadoop/hbase/regionserver/SplitTransaction.java
<http://review.cloudera.org/r/798/#comment3823>

    maybe now we can do an:
    
    assert !this.parent.lock.writeLock().isHeldByCurrentThread() : "Unsafe to hold write lock
while performing RPCs";


- Todd





> 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
>            Priority: Blocker
>         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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