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From "Torsten Curdt (JIRA)" <>
Subject [jira] Created: (CASSANDRA-1177) OutOfMemory on heavy inserts
Date Wed, 09 Jun 2010 15:04:13 GMT
OutOfMemory on heavy inserts

                 Key: CASSANDRA-1177
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.6.2
         Environment: SunOS 5.10, x86 32bit, Jave Hotspot Server VM 11.2-b01 mixed mode
            Reporter: Torsten Curdt
            Priority: Critical

We have cluster of 6 Cassandra 0.6.2 nodes running under SunOS (see environment).

On initial import (using the thrift API) we see some weird behavior of half the cluster. While
cas04-06 look fine as you can see from the attached munin graphs, the other 3 nodes kept on
GCing (see log file) until they became unreachable and went OOM. (This is also why the stats
are so spotty - munin could no longer reach the boxes) We have seen the same behavior on 0.6.2
and 0.6.1. This started after around 100 million inserts.

Looking at the hprof (which is of course to big to attach) we see lots of ConcurrentSkipListMap$Node's
and quite some Column objects. Please see the stats attached.

This looks similar to but we are not
sure it really is the same.

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