Wei Zhu created CASSANDRA-9059:
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Summary: read_repair slows down the response for mulit-dc setup
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
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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