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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3386) Avoid lock contention in hint rows
Date Thu, 20 Oct 2011 16:05:10 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131714#comment-13131714
] 

Hudson commented on CASSANDRA-3386:
-----------------------------------

Integrated in Cassandra-0.8 #383 (See [https://builds.apache.org/job/Cassandra-0.8/383/])
    avoid locking on update when no indexes are involved
patch by jbellis; reviewed by slebrense for CASSANDRA-3386

jbellis : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1186803
Files : 
* /cassandra/branches/cassandra-0.8/CHANGES.txt
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/db/Table.java

                
> Avoid lock contention in hint rows
> ----------------------------------
>
>                 Key: CASSANDRA-3386
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3386
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.8.8, 1.0.1
>
>         Attachments: 3386.txt
>
>
> As pointed out by Yang in CASSANDRA-3385, hint writes are keyed by target IP, to make
replay efficient. However, this means that we'll hit a lot of lock contention in table.apply
where we synchronize for potential index updates.

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