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From "Shotaro Kamio (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-2557) StorageProxy sends same message multiple times
Date Tue, 26 Apr 2011 06:45:03 GMT
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


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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