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From "xiangzhou xia (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13736) consistency level change in batchlog send from CASSANDRA-9673 cause atomic batch p99 increase 3x
Date Tue, 01 Aug 2017 03:38:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

xiangzhou xia updated CASSANDRA-13736:
--------------------------------------
    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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