Jay Zhuang created CASSANDRA-13508:
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Summary: Make system.paxos table compaction strategy configurable
and make TWCS as default
Key: CASSANDRA-13508
URL: https://issues.apache.org/jira/browse/CASSANDRA-13508
Project: Cassandra
Issue Type: Improvement
Reporter: Jay Zhuang
Assignee: Jay Zhuang
Fix For: 4.0, 4.x
Attachments: test1.png, test2.png
The default compaction strategy for {{system.paxos}} table is LCS for
performance reason: CASSANDRA-7753. But for CAS heavily used cluster, the
system is busy with {{system.paxos}} compaction.
As the data in {{paxos}} table are TTL'ed, TWCS might be a better fit. In our
test, it significantly reduced the number of compaction without impacting the
latency too much:
!test1.png!
The time window for TWCS is set to 2 minutes for the test.
Here is the p99 latency impact:
!test2.png!
the yellow one is LCS, the purple one is TWCS. Average p99 has about 10%
increase.
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