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http://jira.amdatu.org/jira/browse/AMDATUCASSANDRA-171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivo Ladage - van Doorn updated AMDATUCASSANDRA-171:
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Attachment: AMDATUCASSANDRA-171.patch
Attached GIT patch file for 0.8.10
> QUORUM range scan read triggers unnecessary row mutation in a 3-node
> cluster with RF 3
> ----------------------------------------------------------------------------------------
>
> Key: AMDATUCASSANDRA-171
> URL: http://jira.amdatu.org/jira/browse/AMDATUCASSANDRA-171
> Project: Amdatu Cassandra
> Issue Type: Bug
> Components: Cassandra server
> Affects Versions: 0.2.2
> Reporter: Ivo Ladage - van Doorn
> Assignee: Ivo Ladage - van Doorn
> Fix For: 0.2.3
>
> Attachments: AMDATUCASSANDRA-171.patch
>
>
> In a 3-node cluster with RF 3 and R/W consistency levels QUORUM, a range scan
> query triggers an unnecessary row mutation. Th issue manifests itself in
> org.apache.cassandra.service.RangeSliceResponseResolver. For a QUORUM read,
> it only needs to send read requests to two nodes to reach the CL, and so it
> does. The RangeSliceResponseResolver evaluates the results to verify if a
> node responded with an out of date value and needs to be repaired.
> Now the problem is that only two requests are send, but the
> RangeSliceResponseResolver verifies the versions returned by all 3 nodes. As
> only two versions are retrieved, one of these versions is null and so the
> RangeSliceResponseResolver concludes that it needs to be updated and creates
> a row mutation for it.
> In fact, the issue is a mismatch between the endpoints to which READ requests
> are send in StorageProxy.getRangeSlice line 706 and the version results
> compared in RangeSliceResponseResolver line 122.
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