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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6930) [89-fb] Avoid acquiring the same row lock repeatedly
Date Mon, 22 Oct 2012 04:42:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481171#comment-13481171

Lars Hofhansl commented on HBASE-6930:

The title/description here and the patch (and review) do not seem to mingle...
> [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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