> vic...@****:~$ sudo ps aux | grep "cassandra" > cassandra 11034 0.2 22.9 1107772 462764 ? Sl Dec17 6:13 > /usr/bin/java -ea -Xms128M -Xmx512M -XX:+UseParNewGC -XX:+UseConcMarkSweepGC > -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1 > -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly > -XX:+HeapDumpOnOutOfMemoryError -Dcom.sun.management.jmxremote.port=8081 > -Dcom.sun.management.jmxremote.ssl=false > -Dcom.sun.management.jmxremote.authenticate=false > -Dstorage-config=bin/../conf -Dcassandra-foreground=yes -cp > bin/../conf:bin/../build/classes:bin/../lib/antlr-3.1.3.jar:bin/../lib/apache-cassandra-0.6.6.jar:bin/../lib/clhm-production.jar:bin/../lib/commons-cli-1.1.jar:bin/../lib/commons-codec-1.2.jar:bin/../lib/commons-collections-3.2.1.jar:bin/../lib/commons-lang-2.4.jar:bin/../lib/google-collections-1.0.jar:bin/../lib/hadoop-core-0.20.1.jar:bin/../lib/high-scale-lib.jar:bin/../lib/ivy-2.1.0.jar:bin/../lib/jackson-core-asl-1.4.0.jar:bin/../lib/jackson-mapper-asl-1.4.0.jar:bin/../lib/jline-0.9.94.jar:bin/../lib/json-simple-1.1.jar:bin/../lib/libthrift-r917130.jar:bin/../lib/log4j-1.2.14.jar:bin/../lib/slf4j-api-1.5.8.jar:bin/../lib/slf4j-log4j12-1.5.8.jar > org.apache.cassandra.thrift.CassandraDaemon > > Cassandra uses 462764 Kb, roughly 460 Mb for 2 Mb of data... And it keeps > getting bigger. > It is important to know that I have just a few insert, quite a lot of read > though. Also Cassandra seams to completly ignore the JVM limitations such as > Xmx. > If I don't stop and launch Cassandra every 15 ou 20 days it simply crashes, > due to oom errors.
The resident size is not unexpected given that your Xmx is 512 MB. The virtual may or may not be expected depending; for example thread stacks as previously discussed in this thread. If you're not seeing the *resident* set size go above the maximum heap size, you're unlikely to be seeing the same problem. WIth respect to OOM, see http://www.riptano.com/docs/0.6/operations/tuning - but without more information it's difficult to know what specifically it is that you're hitting. Are you seriously saying you're running for 15-20 days with only 2 mb of live data? -- / Peter Schuller
