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https://issues.apache.org/jira/browse/CASSANDRA-1664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934084#action_12934084
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ivan commented on CASSANDRA-1664:
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The need patch was born to optimize read when networktopologystrategy is used.
Optimization is done in NetrworkTopologyStrategy.calculateNaturalEndpoint (for
a read request just servers in local dc provided). I think we must separate
read and write requests in this method.
All other modificaton is needed because StorageProxy can decide which type of
request arrived.
> NetworkTopologyStrategy + DCQUORUM
> ----------------------------------
>
> Key: CASSANDRA-1664
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1664
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.7 beta 1
> Environment: Linux 2.6.18
> JVM 6b11
> Reporter: ivan
> Fix For: 0.7.1
>
> Attachments: 1664_v2.txt, ntrs.patch
>
>
> We experience TSocket: timed out reading expections randomly using DCQUORUM.
> In log we see that sometimes responses are not sent to client.
> Read requests are sent to all cluster members instead of member of a DC.
> Attached patch adds a new commandType argument to *NaturalEndpoint methods.
> It's needed to separate endpoint list for read and write commands, so for
> read requests endpoint list will contain servers in local DC.
> For write requests endpoints provided in all DCs.
> In DatacenterQuorumResponseHandler.response signal is not sent in some cases.
> (In this case we experienced timed out reading exceptions.)
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