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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2295) Row locks may deadlock with themselves
Date Sun, 07 Mar 2010 19:11:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842465#action_12842465
] 

dhruba borthakur commented on HBASE-2295:
-----------------------------------------

are you talking about the multiPut where multiple rows could be updated atomically by an app?


> 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
>
> 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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