diff options
Diffstat (limited to 'config/cassandra/cassandra-env.sh')
| -rw-r--r-- | config/cassandra/cassandra-env.sh | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/config/cassandra/cassandra-env.sh b/config/cassandra/cassandra-env.sh new file mode 100644 index 0000000..c296abf --- /dev/null +++ b/config/cassandra/cassandra-env.sh @@ -0,0 +1,124 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +calculate_heap_size() +{ + case "`uname`" in + Linux) + system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'` + MAX_HEAP_SIZE=$((system_memory_in_mb / 2))M + return 0 + ;; + FreeBSD) + system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'` + MAX_HEAP_SIZE=$((system_memory_in_bytes / 1024 / 1024 / 2))M + return 0 + ;; + *) + MAX_HEAP_SIZE=1024M + return 1 + ;; + esac +} + +# The amount of memory to allocate to the JVM at startup, you almost +# certainly want to adjust this for your environment. If left commented +# out, the heap size will be automatically determined by calculate_heap_size +# MAX_HEAP_SIZE="4G" + +if [ "x$MAX_HEAP_SIZE" = "x" ]; then + calculate_heap_size +fi + +# Specifies the default port over which Cassandra will be available for +# JMX connections. +JMX_PORT="9090" + +# To use mx4j, an HTML interface for JMX, add mx4j-tools.jar to the lib/ directory. +# By default mx4j listens on 0.0.0.0:8081. Uncomment the following lines to control +# its listen address and port. +#MX4J_ADDRESS="-Dmx4jaddress=0.0.0.0" +#MX4J_PORT="-Dmx4jport=8081" + + +# Here we create the arguments that will get passed to the jvm when +# starting cassandra. + +# enable assertions. disabling this in production will give a modest +# performance benefit (around 5%). +#JVM_OPTS="$JVM_OPTS -ea" + +# enable thread priorities, primarily so we can give periodic tasks +# a lower priority to avoid interfering with client workload +JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities" +# allows lowering thread priority without being root. see +# http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workaround.html +JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42" + +# min and max heap sizes should be set to the same value to avoid +# stop-the-world GC pauses during resize, and so that we can lock the +# heap in memory on startup to prevent any of it from being swapped +# out. +JVM_OPTS="$JVM_OPTS -Xms$MAX_HEAP_SIZE" +JVM_OPTS="$JVM_OPTS -Xmx$MAX_HEAP_SIZE" +JVM_OPTS="$JVM_OPTS -XX:+HeapDumpOnOutOfMemoryError" + +if [ "`uname`" = "Linux" ] ; then + # reduce the per-thread stack size to minimize the impact of Thrift + # thread-per-client. (Best practice is for client connections to + # be pooled anyway.) Only do so on Linux where it is known to be + # supported. + JVM_OPTS="$JVM_OPTS -Xss256k" +fi + +# GC tuning options +JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC" +JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC" +JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled" +JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=8" +JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1" +JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75" +JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly" + +# GC logging options -- uncomment to enable +# JVM_OPTS="$JVM_OPTS -XX:+PrintGCDetails" +# JVM_OPTS="$JVM_OPTS -XX:+PrintGCTimeStamps" +# JVM_OPTS="$JVM_OPTS -XX:+PrintClassHistogram" +# JVM_OPTS="$JVM_OPTS -XX:+PrintTenuringDistribution" +# JVM_OPTS="$JVM_OPTS -XX:+PrintGCApplicationStoppedTime" +# JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc.log" + +# Prefer binding to IPv4 network intefaces (when net.ipv6.bindv6only=1). See +# http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342561 (short version: +# comment out this entry to enable IPv6 support). +JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true" + +# jmx: metrics and administration interface +# +# add this if you're having trouble connecting: +# JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<public name>" +# +# see +# http://blogs.sun.com/jmxetc/entry/troubleshooting_connection_problems_in_jconsole +# for more on configuring JMX through firewalls, etc. (Short version: +# get it working with no firewall first.) + +# Disable JMX so multiple cassandras can run on 127.0.0.1, .2, .3, etc. +#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.port=$JMX_PORT" +#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=false" +#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false" +#JVM_OPTS="$JVM_OPTS $MX4J_ADDRESS" +#JVM_OPTS="$JVM_OPTS $MX4J_PORT" |