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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7486) Migrate to G1GC by default
Date Thu, 28 May 2015 14:28:23 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14562958#comment-14562958
] 

Jonathan Ellis commented on CASSANDRA-7486:
-------------------------------------------

Yes, irc discussion.  Basically options are to try to exhaustively test the hell out of it
in the lab or to throw it over the wall and let users test it.

Since we don't have the resources for the former, and the latter is pretty low risk (you can
always copy back in the 2.2 defaults yourself), and we have pretty solid evidence from early
adopters that it's an improvement in the real world, we are going with the latter rather than
continuing to sit on it.

> Migrate to G1GC by default
> --------------------------
>
>                 Key: CASSANDRA-7486
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7486
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Config
>            Reporter: Jonathan Ellis
>            Assignee: Albert P Tobey
>             Fix For: 3.0 beta 1
>
>
> See http://www.slideshare.net/MonicaBeckwith/garbage-first-garbage-collector-g1-7486gc-migration-to-expectations-and-advanced-tuning
and https://twitter.com/rbranson/status/482113561431265281
> May want to default 2.1 to G1.
> 2.1 is a different animal from 2.0 after moving most of memtables off heap.  Suspect
this will help G1 even more than CMS.  (NB this is off by default but needs to be part of
the test.)



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