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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Cassandra memory consumption
Date Tue, 08 Feb 2011 16:47:20 GMT
I missed the part where you explained where you're getting your numbers from.

On Tue, Feb 8, 2011 at 9:32 AM, Victor Kabdebon
<victor.kabdebon@gmail.com> wrote:
> It is really weird that I am the only one to have this issue.
> I restarted Cassandra today and already the memory compution is over the
> limit :
>
> root      1739  4.0 24.5 664968 494996 pts/4   SLl  15:51   0:12
> /usr/bin/java -ea -Xms128M -Xmx256M -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 -cp
> bin/../conf:bin/../build/classes:bin/../lib/antlr-3.1.3.jar:bin/../lib/apache-cassandra-0.6.6.jar:bin/../lib/avro-1.2.0-dev.jar:bin/../lib/cassandra-javautils.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-io-1.4.jar:bin/../lib/commons-lang-2.4.jar:bin/../lib/commons-pool-1.5.4.jar:bin/../lib/google-collections-1.0.jar:bin/../lib/hadoop-core-0.20.1.jar:bin/../lib/hector-0.6.0-14.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/jna.jar:bin/../lib/json-simple-1.1.jar:bin/../lib/libthrift-r917130.jar:bin/../lib/log4j-1.2.14.jar:bin/../lib/perf4j-0.9.12.jar:bin/../lib/slf4j-api-1.5.8.jar:bin/../lib/slf4j-log4j12-1.5.8.jar:bin/../lib/uuid-3.1.jar
> org.apache.cassandra.thrift.CassandraDaemon
>
> It is really an annoying problem if we cannot really foresee memory
> consumption.
>
> Best regards,
> Victor K
>
> 2011/2/8 Victor Kabdebon <victor.kabdebon@gmail.com>
>>
>> Dear all,
>>
>> Sorry to come back again to this point but I am really worried about
>> Cassandra memory consumption. I have a single machine that runs one
>> Cassandra server. There is almost no data on it but I see a crazy memory
>> consumption and it doesn't care at all about the instructions...
>> Note that I am not using mmap, but "Standard", I use also JNA (inside lib
>> folder), i am running on debian 5 64 bits, so a pretty normal configuration.
>> I also use Cassandra 0.6.8.
>>
>>
>> Here are the informations I gathered on Cassandra :
>>
>> 105      16765  0.1 34.1 1089424 687476 ?      Sl   Feb02  14:58
>> /usr/bin/java -ea -Xms128M -Xmx256M -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/avro-1.2.0-dev.jar:bin/../lib/cassandra-javautils.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-io-1.4.jar:bin/../lib/commons-lang-2.4.jar:bin/../lib/commons-pool-1.5.4.jar:bin/../lib/google-collections-1.0.jar:bin/../lib/hadoop-core-0.20.1.jar:bin/../lib/hector-0.6.0-14.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/jna.jar:bin/../lib/json-simple-1.1.jar:bin/../lib/libthrift-r917130.jar:bin/../lib/log4j-1.2.14.jar:bin/../lib/perf4j-0.9.12.jar:bin/../lib/slf4j-api-1.5.8.jar:bin/../lib/slf4j-log4j12-1.5.8.jar:bin/../lib/uuid-3.1.jar
>> org.apache.cassandra.thrift.CassandraDaemon
>>
>> result of nodetool info :
>>
>> 116024732779488843382476400091948985708
>> Load             : 1,94 MB
>> Generation No    : 1296673772
>> Uptime (seconds) : 467550
>> Heap Memory (MB) : 120,26 / 253,94
>>
>>
>> I have about 21 column families, none of them have a lot of information (
>> as you see I have 2 Mb of text which is really small). Even if I set Xmx at
>> 256 there is 687M of memory used. Where does this memory come from ? Bad
>> garbage collection ? Something that I ignore ?
>> Thank you for your help I really need to get rid of that problem.
>>
>> Best regards,
>> Victor Kabdebon
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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