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From "Jeremiah Jordan (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 01:27:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977533#comment-14977533
] 

Jeremiah Jordan commented on CASSANDRA-10276:
---------------------------------------------

I think saving on write amplification is a good idea.  You don't want to be compacting the
2 5 GB files with the 2 5 MB file just because there are 4 files in the window.

> 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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