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https://issues.apache.org/jira/browse/CASSANDRA-7486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520071#comment-14520071
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Jonathan Ellis edited comment on CASSANDRA-7486 at 4/29/15 7:53 PM:
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> IMO consistent performance should always take precedence over maximum
> performance/throughput.
Agreed. I think our bar here should be "Is G1 better for the average user"
keeping in mind that the average user is a *lot* worse at tuning CMS than
Ariel. Power users can tune for their own workload the way they always have.
(Edit: this is not to say that more testing is not warranted, but let's
approach this from, "if we were choosing a default today what would we do" and
not "let's not switch unless we can prove that G1 is always better everywhere.")
was (Author: jbellis):
> IMO consistent performance should always take precedence over maximum
> performance/throughput.
Agreed. I think our bar here should be "Is G1 better for the average user"
keeping in mind that the average user is a *lot* worse at tuning CMS than
Ariel. Power users can tune for their own workload the way they always have.
> Compare CMS and G1 pause times
> ------------------------------
>
> Key: CASSANDRA-7486
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7486
> Project: Cassandra
> Issue Type: Test
> Components: Config
> Reporter: Jonathan Ellis
> Assignee: Shawn Kumar
> Fix For: 2.1.x
>
>
> 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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