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From Jason Tang <ares.t...@gmail.com>
Subject Much more native memory used by Cassandra then the configured JVM heap size
Date Tue, 12 Jun 2012 01:14:49 GMT
Hi

We have some problem with Cassandra memory usage, we configure the JVM HEAP
6G, but after runing Cassandra for several hours (insert, update, delete).
The total memory used by Cassandra go up to 15G, which cause the OS low
memory.
 So I wonder if it is normal to have so many memory used by cassandra?

        And how to limit the native memory used by Cassandra?


===========================
Cassandra 1.0.3, 64 bit jdk.

Memory ocupied by Cassandra 15G
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 9567 casadm    20   0 28.3g  15g 9.1g S  269 65.1 385:57.65 java

=============================
-Xms6G -Xmx6G -Xmn1600M

 # ps -ef | grep  9567
casadm    9567     1 55 Jun11 ?        05:59:44 /opt/jdk1.6.0_29/bin/java
-ea -javaagent:/opt/dve/cassandra/bin/../lib/jamm-0.2.5.jar
-XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms6G -Xmx6G
-Xmn1600M -XX:+HeapDumpOnOutOfMemoryError -Xss128k -XX:+UseParNewGC
-XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio=8
-XX:MaxTenuringThreshold=1 -XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly -Djava.net.preferIPv4Stack=true
-Dcom.sun.management.jmxremote.port=6080
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
-Daccess.properties=/opt/dve/cassandra/conf/access.properties
-Dpasswd.properties=/opt/dve/cassandra/conf/passwd.properties
-Dpasswd.mode=MD5 -Dlog4j.configuration=log4j-server.properties
-Dlog4j.defaultInitOverride=true -cp
/opt/dve/cassandra/bin/../conf:/opt/dve/cassandra/bin/../build/classes/main:/opt/dve/cassandra/bin/../build/classes/thrift:/opt/dve/cassandra/bin/../lib/Cassandra-Extensions-1.0.0.jar:/opt/dve/cassandra/bin/../lib/antlr-3.2.jar:/opt/dve/cassandra/bin/../lib/apache-cassandra-1.0.3.jar:/opt/dve/cassandra/bin/../lib/apache-cassandra-clientutil-1.0.3.jar:/opt/dve/cassandra/bin/../lib/apache-cassandra-thrift-1.0.3.jar:/opt/dve/cassandra/bin/../lib/avro-1.4.0-fixes.jar:/opt/dve/cassandra/bin/../lib/avro-1.4.0-sources-fixes.jar:/opt/dve/cassandra/bin/../lib/commons-cli-1.1.jar:/opt/dve/cassandra/bin/../lib/commons-codec-1.2.jar:/opt/dve/cassandra/bin/../lib/commons-lang-2.4.jar:/opt/dve/cassandra/bin/../lib/compress-lzf-0.8.4.jar:/opt/dve/cassandra/bin/../lib/concurrentlinkedhashmap-lru-1.2.jar:/opt/dve/cassandra/bin/../lib/guava-r08.jar:/opt/dve/cassandra/bin/../lib/high-scale-lib-1.1.2.jar:/opt/dve/cassandra/bin/../lib/jackson-core-asl-1.4.0.jar:/opt/dve/cassandra/bin/../lib/jackson-mapper-asl-1.4.0.jar:/opt/dve/cassandra/bin/../lib/jamm-0.2.5.jar:/opt/dve/cassandra/bin/../lib/jline-0.9.94.jar:/opt/dve/cassandra/bin/../lib/json-simple-1.1.jar:/opt/dve/cassandra/bin/../lib/libthrift-0.6.jar:/opt/dve/cassandra/bin/../lib/log4j-1.2.16.jar:/opt/dve/cassandra/bin/../lib/servlet-api-2.5-20081211.jar:/opt/dve/cassandra/bin/../lib/slf4j-api-1.6.1.jar:/opt/dve/cassandra/bin/../lib/slf4j-log4j12-1.6.1.jar:/opt/dve/cassandra/bin/../lib/snakeyaml-1.6.jar:/opt/dve/cassandra/bin/../lib/snappy-java-1.0.4.1.jar
org.apache.cassandra.thrift.CassandraDaemon

==============================
# nodetool -h 127.0.0.1 -p 6080 info
Token            : 85070591730234615865843651857942052864
Gossip active    : true
Load             : 20.59 GB
Generation No    : 1339423322
Uptime (seconds) : 39626
Heap Memory (MB) : 3418.42 / 5984.00
Data Center      : datacenter1
Rack             : rack1
Exceptions       : 0

=============================
All row cache and key cache are disabled by default

                Key cache: disabled
                Row cache: disabled


==============================

# pmap 9567
9567: java
START               SIZE     RSS     PSS   DIRTY    SWAP PERM MAPPING
0000000040000000     36K     36K     36K      0K      0K r-xp
/opt/jdk1.6.0_29/bin/java
0000000040108000      8K      8K      8K      8K      0K rwxp
/opt/jdk1.6.0_29/bin/java
000000004010a000  18040K  17988K  17988K  17988K      0K rwxp [heap]
000000067ae00000 6326700K 6258664K 6258664K 6258664K      0K rwxp [anon]
00000007fd06b000  48724K      0K      0K      0K      0K rwxp [anon]
00007fbed1530000 1331104K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Data.db
00007fbf22918000 2097152K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Data.db
00007fbfa2918000 2097148K 1124464K 1124462K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Data.db
00007fc022917000 2097156K 2096496K 2096492K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Data.db
00007fc0a2918000 2097148K 2097148K 2097146K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Data.db
00007fc1a2917000 733584K   6444K   6444K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-109-Data.db
00007fc1cf57b000 2097148K  20980K  20980K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-109-Data.db
00007fc24f57a000 2097152K 456480K 456478K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-109-Data.db
00007fc2cf57a000 2097156K 1168320K 1168318K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-109-Data.db
00007fc34f57b000 2097148K 1177520K 1177520K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-109-Data.db
00007fc405629000 618708K 338248K 338248K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-230-Data.db
00007fc42b25e000 620388K 289024K 289024K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-224-Data.db
00007fc451037000 619160K 342108K 342108K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-216-Data.db
00007fc62b7df000 132696K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxInQueueTime-hb-175-Data.db
00007fc6de8e0000 132696K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxRecvTime-hb-175-Data.db
00007fc6f2bcc000  52492K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxPartitionId-hb-211-Data.db
00007fc6f64dc000  43784K  40840K  40840K      0K      0K r-xs
/var/cassandra/data/drc/fpr_index-hb-91-Data.db
00007fc707ca6000  68968K  37724K  37724K      0K      0K r-xs
/var/cassandra/data/drc/queue-hb-219-Index.db
00007fc70c000000   2468K   2436K   2436K   2436K      0K rwxp [anon]
00007fc70c269000  63068K      0K      0K      0K      0K ---p [anon]
00007fc710b9e000  52888K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxInQueueTime-hb-216-Data.db
00007fc713f44000  52952K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxFireTimeRange-hb-140-Data.db
00007fc7172fa000  52952K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxFireTime-hb-140-Data.db
00007fc71bd13000 162992K 162984K 162984K      0K      0K r-xs
/var/cassandra/data/drc/fpr_index-hb-80-Data.db
00007fc725c3f000  52952K  28712K  28712K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxInQueueTimeRange-hb-140-Data.db
00007fc728ff5000  52952K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxRecvTimeRange-hb-140-Data.db
00007fc72d026000  52480K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxRecvTimeRange-hb-211-Data.db
00007fc730366000  52564K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxStatus-hb-196-Data.db
00007fc7336bb000  22348K      0K      0K      0K      0K r-xs
/var/cassandra/data/drc/queue.idxInQueueTime-hb-175-Index.db


BRs
//Ares Tang

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