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From Sasha Dolgy <>
Subject Re: OOM (or, what settings to use on AWS large?)
Date Wed, 22 Jun 2011 12:41:45 GMT
We had a similar problem a last month and found that the OS eventually
in the end killed the Cassandra process on each of our nodes ... I've
upgraded to 0.8.0 from 0.7.6-2 and have not had the problem since, but
i do see consumption levels rising consistently from one day to the
next on each node ..

On Wed, Jun 1, 2011 at 2:30 PM, Sasha Dolgy <> wrote:
> is there a specific string I should be looking for in the logs that
> isn't super obvious to me at the moment...
> On Tue, May 31, 2011 at 8:21 PM, Jonathan Ellis <> wrote:
>> The place to start is with the statistics Cassandra logs after each GC.

look for GCInspector

I found this in the logs on all my servers but never did much after that....

On Wed, Jun 22, 2011 at 2:33 PM, William Oberman
<> wrote:
> I woke up this morning to all 4 of 4 of my cassandra instances reporting
> they were down in my cluster.  I quickly started them all, and everything
> seems fine.  I'm doing a postmortem now, but it appears they all OOM'd at
> roughly the same time, which was not reported in any cassandra log, but I
> discovered something in /var/log/kern that showed java died of oom(*).  In
> amazon, I'm using large instances for cassandra, and they have no swap (as
> recommended), so I have ~8GB of ram.  Should I use a different max mem
> setting?  I'm using a stock rpm from riptano/datastax.  If I run "ps -aux" I
> get:
> /usr/bin/java -ea -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42
> -Xms3843M -Xmx3843M -Xmn200M -XX:+HeapDumpOnOutOfMemoryError -Xss128k
> -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled
> -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1
> -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly
> -Djava.rmi.server.hostname=X.X.X.X
> -Dmx4jaddress=
> -Dmx4jport=8081
> -Dlog4j.defaultInitOverride=true
> -Dcassandra-pidfile=/var/run/cassandra/ -cp
> :/etc/cassandra/conf:/usr/share/cassandra/lib/antlr-3.1.3.jar:/usr/share/cassandra/lib/apache-cassandra-0.7.4.jar:/usr/share/cassandra/lib/avro-1.4.0-fixes.jar:/usr/share/cassandra/lib/avro-1.4.0-sources-fixes.jar:/usr/share/cassandra/lib/commons-cli-1.1.jar:/usr/share/cassandra/lib/commons-codec-1.2.jar:/usr/share/cassandra/lib/commons-collections-3.2.1.jar:/usr/share/cassandra/lib/commons-lang-2.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.1.jar:/usr/share/cassandra/lib/guava-r05.jar:/usr/share/cassandra/lib/high-scale-lib.jar:/usr/share/cassandra/lib/jackson-core-asl-1.4.0.jar:/usr/share/cassandra/lib/jackson-mapper-asl-1.4.0.jar:/usr/share/cassandra/lib/jetty-6.1.21.jar:/usr/share/cassandra/lib/jetty-util-6.1.21.jar:/usr/share/cassandra/lib/jline-0.9.94.jar:/usr/share/cassandra/lib/json-simple-1.1.jar:/usr/share/cassandra/lib/jug-2.0.0.jar:/usr/share/cassandra/lib/libthrift-0.5.jar:/usr/share/cassandra/lib/log4j-1.2.16.jar:/usr/share/cassandra/lib/mx4j-tools.jar:/usr/share/cassandra/lib/servlet-api-2.5-20081211.jar:/usr/share/cassandra/lib/slf4j-api-1.6.1.jar:/usr/share/cassandra/lib/slf4j-log4j12-1.6.1.jar:/usr/share/cassandra/lib/snakeyaml-1.6.jar
> org.apache.cassandra.thrift.CassandraDaemon
> (*) Also, why would they all OOM so close to each other?  Bad luck?  Or once
> the first node went down, is there an increased chance of the rest?
> I'm still on 0.7.4, when I released cassandra to production that was the
> latest release.  In addition to (or instead of?) fixing memory settings, I'm
> guessing I should upgrade.
> will

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