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https://issues.apache.org/jira/browse/CASSANDRA-9059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Philip Thompson resolved CASSANDRA-9059.
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Resolution: Duplicate
> read_repair slows down the response for mulit-dc setup with LOCAL_QUORUM read
> CL
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-9059
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9059
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: CentOS 6.6 , Cassandra 2.0.8
> Reporter: Wei Zhu
> Fix For: 2.0.14
>
> Attachments: coodidatorreadlatency_after.png,
> coodidatorreadlatency_before.png
>
>
> We have two DC setup for the Cassandra Cluster. 7 nodes each, RF = 3. We
> setup CL as LOCAL_QUORUM for both read and write.
> We have noticed that 95th percentile coordiantorReadLatency is at 60ms range.
> We modified read_repair_chance for this CF to 0.0 from the default 0.1, we
> see dramatic improvements for the coordiantorReadLatency. It went down to
> 10ms.
> I suspect read_repair somehow waits/blocks the response from other DC which
> shouldn't happen.
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