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https://issues.apache.org/jira/browse/CASSANDRA-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shotaro Kamio updated CASSANDRA-2557:
-------------------------------------
Comment: was deleted
(was: The problem occurs because the sendMessages() is within for-loop of
StorageProxy. A patch to fix that is attached.)
> 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
> 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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