[
https://issues.apache.org/jira/browse/CASSANDRA-11119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15131524#comment-15131524
]
Jonathan Ellis commented on CASSANDRA-11119:
--------------------------------------------
(Note that STCS-in-L0 doesn't need to be special cased for LCS, since we're
just shuffling the work around there, we still ultimately have to move all
those bytes into higher levels.)
> 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).
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
