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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2011/04/26 09:01:03 UTC

[jira] [Resolved] (CASSANDRA-2557) StorageProxy sends same message multiple times

     [ https://issues.apache.org/jira/browse/CASSANDRA-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne resolved CASSANDRA-2557.
-----------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.8.0
         Reviewer: slebresne

Good catch. Committed, thanks!

> StorageProxy sends same message multiple times
> ----------------------------------------------
>
>                 Key: CASSANDRA-2557
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2557
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8 beta 1
>         Environment: linux
>            Reporter: Shotaro Kamio
>             Fix For: 0.8.0
>
>         Attachments: StorageProxy.java.patch
>
>
> A cassandra node gets multiple mutation messages (in number of times of replication factor at maximum) for an insert. It may cause high load on the node. The mutation should be only once for each insert.
> This bug is visible via MutationStage count in nodetool tpstats.
> For instance, if you have 6 node cluster (initial keys are 31, 32, 33, 34, 35 and 36) with replication factor = 4 and a single data (for example, key='2') is inserted, MutationStage count will be as follows:
> node 1: MutationStage 0 0 4
> node 2: MutationStage 0 0 3
> node 3: MutationStage 0 0 2
> node 4: MutationStage 0 0 1
> node 5: MutationStage 0 0 0
> node 6: MutationStage 0 0 0
> As you can see, the counts are different in each node.

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