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From "Sergio Bossa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7047) TriggerExecutor should group mutations by row key
Date Wed, 23 Apr 2014 14:46:17 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13978252#comment-13978252
] 

Sergio Bossa commented on CASSANDRA-7047:
-----------------------------------------

Not much different, but you're right, probably not worth any extra time. 

+1

> TriggerExecutor should group mutations by row key
> -------------------------------------------------
>
>                 Key: CASSANDRA-7047
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7047
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sergio Bossa
>            Assignee: Aleksey Yeschenko
>             Fix For: 2.0.8, 2.1 beta2
>
>         Attachments: 7047-v2.txt, 7047-v3.txt, 7047-v4.txt, CASSANDRA-7047.patch
>
>
> TriggerExecutor doesn't currently group mutations returned by triggers even if belonging
to the same row key: while harmless per se (at least, I think so), this is definitely a performance
problem, because each mutation is a *cluster* mutation, generating more network traffic, more
disk IO and more index calls (if present).



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