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https://issues.apache.org/jira/browse/CASSANDRA-7486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550741#comment-14550741
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Albert P Tobey commented on CASSANDRA-7486:
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Did you run into evacuation failures? How big was your heap? I haven't seen any
evac failures with 2.1 and Java 8. This is one of the things that was worked on
for Hotspot 1.8. Then again maybe it's Solr that needs the help.
I suspect you can remove a lot of these settings on Java 8, but have also
discovered that setting the GC threads is necessary on many machines.
Try adding the below line for a nice decrease in p99 latencies.
JVM_OPTS="$JVM_OPTS -XX:G1RSetUpdatingPauseTimePercent=5"
> 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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