[jira] [Created] (CASSANDRA-12608) For LCS compaction sessions, have compactionstats to print out src_level and dst_level

["Wei Deng (JIRA)" <ji...@apache.org>]

Wei Deng created CASSANDRA-12608:
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             Summary: 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


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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