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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2295) Row locks may deadlock with themselves
Date Tue, 09 Mar 2010 08:21:27 GMT

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

dhruba borthakur updated HBASE-2295:
------------------------------------

    Attachment: rowLockDeadlock2.txt

This patch incorporates Todd's and Stack's comments. And is for hbase trunk.

> 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
>         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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