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From "sankalp kohli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13508) Make system.paxos table compaction strategy configurable
Date Fri, 19 May 2017 23:36:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018167#comment-16018167
] 

sankalp kohli commented on CASSANDRA-13508:
-------------------------------------------

Your benchmark is on which version of C*? 

> Make system.paxos table compaction strategy configurable
> --------------------------------------------------------
>
>                 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: test11.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:
> !test11.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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