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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11550) Make the fanout size for LeveledCompactionStrategy to be configurable
Date Mon, 29 Aug 2016 08:15:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15445203#comment-15445203
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Marcus Eriksson commented on CASSANDRA-11550:
---------------------------------------------

[~dikanggu] I'm a bit worried that the data might not be 100% fair - changing the fanout on
existing data will cause a bunch of compactions which indeed will make the live size smaller
etc (it might very well still be better with fanout = 6, but not sure this data confirms it)

I'll run a few benchmarks using compaction-stress to compare number of compactions etc 

> Make the fanout size for LeveledCompactionStrategy to be configurable
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-11550
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11550
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Compaction
>            Reporter: Dikang Gu
>            Assignee: Dikang Gu
>              Labels: lcs
>             Fix For: 3.x
>
>         Attachments: 0001-make-fanout-size-for-leveledcompactionstrategy-to-be.patch
>
>
> Currently, the fanout size for LeveledCompactionStrategy is hard coded in the system
(10). It would be useful to make the fanout size to be tunable, so that we can change it according
to different use cases.
> Further more, we can change the size dynamically.



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