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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10276) With DTCS, do STCS in windows if more than max_threshold sstables
Date Wed, 28 Oct 2015 01:08:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977509#comment-14977509
] 

Jeff Jirsa commented on CASSANDRA-10276:
----------------------------------------

I haven't convinced myself of the 'best' way to handle the case where you have more than min_threshold
files, but no stcs compaction candidates - in TWCS, I compact them in older windows, justifying
that decision with the rationale that it should be fairly rare, though I think it's also reasonable
to say that a few sstables per window is fine, and it's better to save the write amplification.
Given that I can make arguments on either side, I'm fine with your choice. 

[~krummas] - latest patch looks reasonable to me. +1



> With DTCS, do STCS in windows if more than max_threshold sstables
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-10276
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10276
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>             Fix For: 3.x, 2.1.x, 2.2.x
>
>
> To avoid constant recompaction of files in big ( > max threshold) DTCS windows, we
should do STCS of those files.
> Patch here: https://github.com/krummas/cassandra/commits/marcuse/dtcs_stcs



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