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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2016/02/04 02:16:39 UTC

[jira] [Created] (CASSANDRA-11119) Add bytes-to-compact estimate

Jonathan Ellis created CASSANDRA-11119:
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             Summary: Add bytes-to-compact estimate
                 Key: CASSANDRA-11119
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11119
             Project: Cassandra
          Issue Type: Bug
          Components: Compaction
            Reporter: Jonathan Ellis
             Fix For: 3.x


Pending tasks is essentially useless at letting operators know how far behind compaction is.  For STCS, because compaction tasks can vary in size by several orders of magnitude, so "4 more tasks" is a very wide range.  For LCS, I think the problem is that we only look at first-order work (how much larger is level X than it "should" be?) and not cascading effects, particularly in L0 (if we push this into L1, how much does that push into L2 etc?).

I propose adding an estimate of bytes-to-compact (and deprecating estimated tasks).  



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