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From Jean Carlo <jean.jeancar...@gmail.com>
Subject cassandra dump file path
Date Mon, 03 Oct 2016 10:00:23 GMT
Hi

I see in the log of my node cassandra that the parameter -XX:HeapDumpPath
is charged two times.

INFO  [main] 2016-10-03 04:21:29,941 CassandraDaemon.java:205 - JVM
Arguments: [-ea, -javaagent:/usr/share/cassandra/lib/jamm-0.3.0.jar,
-XX:+CMSClassUnloadingEnabled, -XX:+UseThreadPriorities,
-XX:ThreadPriorityPolicy=42, -Xms6G, -Xmx6G, -Xmn600M,
*-XX:+HeapDumpOnOutOfMemoryError,
-XX:HeapDumpPath=/cassandra/dumps/cassandra-1475461287-pid34435.hprof*,
-Xss256k, -XX:StringTableSize=1000003, -XX:+UseParNewGC,
-XX:+UseConcMarkSweepGC, -XX:+CMSParallelRemarkEnabled,
-XX:SurvivorRatio=8, -XX:MaxTenuringThreshold=1,
-XX:CMSInitiatingOccupancyFraction=30, -XX:+UseCMSInitiatingOccupancyOnly,
-XX:+UseTLAB, -XX:CompileCommandFile=/etc/cassandra/hotspot_compiler,
-XX:CMSWaitDuration=10000, -XX:+CMSParallelInitialMarkEnabled,
-XX:+CMSEdenChunksRecordAlways, -XX:CMSWaitDuration=10000,
-XX:+UseCondCardMark, -XX:+PrintGCDetails, -XX:+PrintGCDateStamps,
-XX:+PrintGCApplicationStoppedTime,
-Xloggc:/var/opt/hosting/log/cassandra/gc.log, -XX:+UseGCLogFileRotation,
-XX:NumberOfGCLogFiles=20, -XX:GCLogFileSize=20M,
-Djava.net.preferIPv4Stack=true, -Dcom.sun.management.jmxremote.port=7199,
-Dcom.sun.management.jmxremote.rmi.port=7199,
-Dcom.sun.management.jmxremote.ssl=false,
-Dcom.sun.management.jmxremote.authenticate=false,
-Dcom.sun.management.jmxremote.password.file=/etc/cassandra/jmxremote.password,
-Djava.io.tmpdir=/var/opt/hosting/db/cassandra/tmp,
-javaagent:/usr/share/cassandra/lib/jolokia-jvm-1.0.6-agent.jar=port=8778,host=0.0.0.0,
-Dcassandra.auth_bcrypt_gensalt_log2_rounds=4,
-Dlogback.configurationFile=logback.xml,
-Dcassandra.logdir=/var/log/cassandra, -Dcassandra.storagedir=,
-Dcassandra-pidfile=/var/run/cassandra/cassandra.pid,
*-XX:HeapDumpPath=/var/lib/cassandra/java_1475461286.hprof*,
-XX:ErrorFile=/var/lib/cassandra/hs_err_1475461286.log]

This option is defined in cassandra-env.sh

if [ "x$CASSANDRA_HEAPDUMP_DIR" != "x" ]; then
    JVM_OPTS="$JVM_OPTS
-XX:HeapDumpPath=$CASSANDRA_HEAPDUMP_DIR/cassandra-`date +%s`-pid$$.hprof"
fi
 and we defined before the value of CASSANDRA_HEAPDUMP_DIR before to


*/cassandra/dumps/*
It is seems that cassandra does not care about the conf in cassandra-env.sh
and he only takes in account the last set for HeapDumpPath

*/var/lib/cassandra/java_1475461286.hprof*
This causes problems when we have to dump the heap because cassandra uses
the disk not suitable to do it.

Is  *XX:HeapDumpPath *set in another place/file that I dont know?

Thxs

Jean Carlo

"The best way to predict the future is to invent it" Alan Kay

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