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From "ivan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1664) NetworkTopologyStrategy + DCQUORUM
Date Sat, 20 Nov 2010 02:33:14 GMT

    [ 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:
---------------------------------

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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