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https://issues.apache.org/jira/browse/CASSANDRA-5078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762966#comment-13762966
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lantao yan commented on CASSANDRA-5078:
---------------------------------------

sorry for the late update. pretty busy recently. even missed Jonathan's London 
meetup. :)
For the conflict on the entry, I don't quite get it. I read the code, it seems 
like one directory (one column family) will be owned by one thread? so there 
won't be any chances, two threads are working on the same column family with 
the same timestamp? I could be wrong. If I miss something, please let me know.
                
> save compaction merge counts in a system table
> ----------------------------------------------
>
>                 Key: CASSANDRA-5078
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5078
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Matthew F. Dennis
>            Assignee: lantao yan
>            Priority: Minor
>              Labels: lhf
>         Attachments: 5078-v3.txt, 5078-v4.txt, patch1.patch
>
>
> we should save the compaction merge stats from CASSANDRA-4894 in the system 
> table and probably expose them via JMX (and nodetool)

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