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https://issues.apache.org/jira/browse/CASSANDRA-13736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dikang Gu reassigned CASSANDRA-13736:
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Assignee: xiangzhou xia
> consistency level change in batchlog send from CASSANDRA-9673 cause atomic
> batch p99 increase 3x
> ------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13736
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13736
> Project: Cassandra
> Issue Type: Bug
> Reporter: xiangzhou xia
> Assignee: xiangzhou xia
>
> we notice that changing consistency level from ONE to TWO dramatically
> increased p99 latency in 3.0 atomic batch. [~iamaleksey] think only block for
> one batchlog message is a bug in batchlog and change it to block for two in
> CASSANDRA-9673, I think it's actually a very good optimization to reduce
> latency. Set the consistency to one will decrease the possibility of slow
> data node (GC, long message queue, etc) affect the latency of atomic batch.
> In our shadow cluster, when we change consistency from two to one, we notice
> a 2x-3x p99 latency drop in atomic batch.
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