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From "Wei Deng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12608) For LCS compaction sessions, have compactionstats to print out src_level and dst_level
Date Sat, 03 Sep 2016 19:15:21 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei Deng updated CASSANDRA-12608:
---------------------------------
    Labels: lcs observation  (was: )

> For LCS compaction sessions, have compactionstats to print out src_level and dst_level
> --------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-12608
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12608
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Compaction
>            Reporter: Wei Deng
>            Priority: Minor
>              Labels: lcs, observation
>
> It seems that we use reportCompactionTable() function in o.a.c.tools.nodetool.CompactionStats
to print out the information for each compaction session, which already has access to compactionID
according to [this line|https://github.com/apache/cassandra/blob/9895837557137b96bb12d371e42138770539e82d/src/java/org/apache/cassandra/tools/nodetool/CompactionStats.java#L92].
This means it should not be hard to get the source level and destination level from a LCS
compaction ID. If we could add two additional columns "src_level" and "dst_level" whenever
we detect a particular compaction session is using LeveledCompactionStrategy, it would be
very helpful in understanding the progress LCS is making and what all of the concurrent compaction
sessions are doing. For none-LCS compaction sessions, these two columns can just print empty
strings.



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