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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