mlowicki created CASSANDRA-9681:
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Summary: 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
Priority: Critical
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.
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