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From Michał Łowicki <>
Subject C* 2.1.2 invokes oom-killer
Date Wed, 18 Feb 2015 18:28:19 GMT

Couple of times a day 2 out of 4 members cluster nodes are killed

root@db4:~# dmesg | grep -i oom
[4811135.792657] [ pid ]   uid  tgid total_vm      rss cpu oom_adj
oom_score_adj name
[6559049.307293] java invoked oom-killer: gfp_mask=0x201da, order=0,
oom_adj=0, oom_score_adj=0

Nodes are using 8GB heap (confirmed with *nodetool info*) and aren't using
row cache.

Noticed that couple of times a day used RSS is growing really fast within
couple of minutes and I see CPU spikes at the same time -

Could be related to compaction but after compaction is finished used RSS
doesn't shrink. Output from pmap when C* process uses 50GB RAM (out of
64GB) is available on At
the time dump was made heap usage is far below 8GB (~3GB) but total RSS is

Any help will be appreciated.

Michał Łowicki

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