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From "Sergio Bossa (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7047) TriggerExecutor should group mutations by row key
Date Sat, 19 Apr 2014 06:48:15 GMT


Sergio Bossa commented on CASSANDRA-7047:

First two cases have been a miss by my side.
Third case was intentional, as I preferred to keep mutations from different triggers separated.
If you want to merge them as well, I'm ok.
I'll have a look ASAP.

> TriggerExecutor should group mutations by row key
> -------------------------------------------------
>                 Key: CASSANDRA-7047
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Sergio Bossa
>            Assignee: Sergio Bossa
>         Attachments: 7047-v2.txt, 7047-v3.txt, CASSANDRA-7047.patch
> TriggerExecutor doesn't currently group mutations returned by triggers even if belonging
to the same row key: while harmful 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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