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https://issues.apache.org/jira/browse/CASSANDRA-13508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jay Zhuang updated CASSANDRA-13508:
-----------------------------------
Description:
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 | height=450,width=650!
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.
was:
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.
> 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 | height=450,width=650!
> 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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