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https://issues.apache.org/jira/browse/CASSANDRA-18027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17631951#comment-17631951
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Michael Semb Wever commented on CASSANDRA-18027:
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bq. Setting NewSize with G1?
Yes, it only floors the new heap size. We see the default new heap size takes
way too long (or never) to adjust to where it needs to be. Flooring it to a
quarter to a half the heap size helps it find/keep its place.
Not to be confused with Xmn or MaxNewSize.
> Use G1GC as default
> -------------------
>
> Key: CASSANDRA-18027
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18027
> Project: Cassandra
> Issue Type: Task
> Components: Local/Config
> Reporter: Michael Semb Wever
> Assignee: Michael Semb Wever
> Priority: Normal
>
> G1GC is well battle tested now, and the recommended configuration for most
> users. CMS can work well on smaller heaps but requires more tuning, initially
> and over time. G1GC just works. CMS was deprecated in JDK 9.
> Patch at
> https://github.com/apache/cassandra/compare/trunk...thelastpickle:cassandra:mck/7486/trunk
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