C. Scott Andreas updated CASSANDRA-13736:
    Component/s: Coordination

> 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
>          Components: Coordination
>            Reporter: xiangzhou xia
>            Assignee: xiangzhou xia
>            Priority: Major
> When we testing atomic batch in production traffic, we found that p99 latency 
> in atomic batch write is 2x-3x worse than 2.2. 
> After debuging, we found that the regression is causing by CASSANDRA-9673. 
> This patch changed consistency level in batchlog store from ONE to TWO. 
> [~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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