[jira] [Created] (CASSANDRA-13736) consistency level change in batchlog send from CASSANDRA-9673 cause atomic batch p99 increase 3x

["xiangzhou xia (JIRA)" <ji...@apache.org>]

xiangzhou xia created CASSANDRA-13736:
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             Summary: 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, 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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