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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-2295) Row locks may deadlock with themselves
Date Tue, 09 Mar 2010 17:11:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-2295.
--------------------------

       Resolution: Fixed
    Fix Version/s: 0.21.0
                   0.20.4
     Hadoop Flags: [Reviewed]

Committed to trunk and branch.  Thanks for patch Dhruba.

> Row locks may deadlock with themselves
> --------------------------------------
>
>                 Key: HBASE-2295
>                 URL: https://issues.apache.org/jira/browse/HBASE-2295
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Todd Lipcon
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: rowLockDeadlock.txt, rowLockDeadlock2.txt
>
>
> Row locks in HRegion are keyed by a int-sized hash of the row key. It's perfectly possible
for two rows to hash to the same key. So, if any client tries to lock both rows, it will deadlock
with itself. Switching to a 64-bit hash is an improvement but still sketchy.

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