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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11119) Add bytes-to-compact estimate
Date Thu, 04 Feb 2016 01:22:40 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15131506#comment-15131506
] 

Brandon Williams commented on CASSANDRA-11119:
----------------------------------------------

FWIW, I have seen people confused about pending tasks, and ultimately I just end up explaining
that it sucks and don't worry about it, so +1.

> 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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