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https://issues.apache.org/jira/browse/CASSANDRA-9681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609685#comment-14609685
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mlowicki commented on CASSANDRA-9681:
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So far so good -
https://www.dropbox.com/s/ad8te1g6iz2wofe/Screenshot%202015-07-01%2009.31.00.png?dl=0.
I'll let you know if it'll degrade or not. GC pauses we've talked about
yesterday are probably caused by misbehaving Logstash or Kibana as I've checked
using jstat and gc.log that everything is fine on this boxes.
> Memtable heap size grows and many long GC pauses are triggered
> --------------------------------------------------------------
>
> Key: CASSANDRA-9681
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9681
> Project: Cassandra
> Issue Type: Bug
> Environment: C* 2.1.7, Debian Wheezy
> Reporter: mlowicki
> Assignee: Benedict
> Priority: Critical
> Fix For: 2.1.x
>
> Attachments: cassandra.yaml, db5.system.log, db5.system.log.1.zip,
> db5.system.log.2.zip, db5.system.log.3.zip, schema.cql, system.log.6.zip,
> system.log.7.zip, system.log.8.zip, system.log.9.zip
>
>
> C* 2.1.7 cluster is behaving really bad after 1-2 days.
> {{gauges.cassandra.jmx.org.apache.cassandra.metrics.ColumnFamily.AllMemtablesHeapSize.Value}}
> jumps to 7 GB
> (https://www.dropbox.com/s/vraggy292erkzd2/Screenshot%202015-06-29%2019.12.53.png?dl=0)
> on 3/6 nodes in each data center and then there are many long GC pauses.
> Cluster is using default heap size values ({{-Xms8192M -Xmx8192M -Xmn2048M}})
> Before C* 2.1.5 memtables heap size was basically constant ~500MB
> (https://www.dropbox.com/s/fjdywik5lojstvn/Screenshot%202015-06-29%2019.30.00.png?dl=0)
> After restarting all nodes is behaves stable for 1-2days. Today I've done
> that and long GC pauses are gone (~18:00
> https://www.dropbox.com/s/7vo3ynz505rsfq3/Screenshot%202015-06-29%2019.28.37.png?dl=0).
> The only pattern we've found so far is that long GC pauses are happening
> basically at the same time on all nodes in the same data center - even on the
> ones where memtables heap size is not growing.
> Cliffs on the graphs are nodes restarts.
> Used memory on boxes where {{AllMemtabelesHeapSize}} grows, stays at the same
> level -
> https://www.dropbox.com/s/tes9abykixs86rf/Screenshot%202015-06-29%2019.37.52.png?dl=0.
> Replication factor is set to 3.
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