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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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xiangzhou xia updated CASSANDRA-13736:
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Description: 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. (was: 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, 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. )
> 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
>
> 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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