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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2010/04/26 18:59:35 UTC

[jira] Updated: (HBASE-2295) Row locks may deadlock with themselves

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

stack updated HBASE-2295:
-------------------------

    Fix Version/s: 0.20.5
                       (was: 0.20.4)

> 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
>            Assignee: dhruba borthakur
>             Fix For: 0.20.5, 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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