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https://issues.apache.org/jira/browse/HBASE-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469004#comment-13469004
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Phabricator commented on HBASE-6930:
------------------------------------

mbautin has closed the revision "[jira] [HBASE-6930] [89-fb] Fix 
TestThriftServerLegacy: notifyAll should be inside synchronized block, and a 
null checkAndMutate expected value should be handled correctly".

CHANGED PRIOR TO COMMIT
  https://reviews.facebook.net/D5841?vs=19251&id=19293#differential-review-toc

REVISION DETAIL
  https://reviews.facebook.net/D5841

COMMIT
  https://reviews.facebook.net/rHBASEEIGHTNINEFBBRANCH1393839

To: Kannan, Liyin, Karthik, JIRA, mbautin

                
> [89-fb] Avoid acquiring the same row lock repeatedly
> ----------------------------------------------------
>
>                 Key: HBASE-6930
>                 URL: https://issues.apache.org/jira/browse/HBASE-6930
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Liyin Tang
>         Attachments: D5841.1.patch, D5841.2.patch
>
>
> When processing the multiPut, multiMutations or multiDelete operations, each 
> IPC handler thread tries to acquire a lock for each row key in these batches. 
> If there are duplicated row keys in these batches, previously the IPC handler 
> thread will repeatedly acquire the same row key again and again.
> So the optimization is to sort each batch operation based on the row key in 
> the client side, and skip acquiring the same row lock repeatedly in the 
> server side.

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