[jira] Updated: (HBASE-2964) Deadlock when RS tries to RPC to itself inside SplitTransaction

["Todd Lipcon (JIRA)" <ji...@apache.org>]

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

Todd Lipcon updated HBASE-2964:
-------------------------------

    Attachment: hbase-2964.txt

I also had to move the "new HTable" call outside of the lock, since the HTable constructor does an RPC.

This patch seems to fix the issue for me. Running an overnight load test - if it's still going in the morning I'd say we're good :)

> 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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