/
cassandra-env.sh
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/
cassandra-env.sh
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# 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_sizes()
{
case "`uname`" in
Linux)
system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'`
system_cpu_cores=`egrep -c 'processor([[:space:]]+):.*' /proc/cpuinfo`
break
;;
FreeBSD)
system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'`
system_memory_in_mb=$((system_memory_in_bytes / 1024 / 1024))
system_cpu_cores=`sysctl hw.ncpu | awk '{print $2}'`
break
;;
*)
# assume reasonable defaults for e.g. a modern desktop or
# cheap server
system_memory_in_mb="2048"
system_cpu_cores="2"
;;
esac
max_heap_size_in_mb=$((system_memory_in_mb / 2))
MAX_HEAP_SIZE="${max_heap_size_in_mb}M"
# Young gen: min(max_sensible_per_modern_cpu_core * num_cores, 1/4 * heap size)
max_sensible_yg_per_core_in_mb="100"
max_sensible_yg_in_mb=$((max_sensible_yg_per_core_in_mb * system_cpu_cores))
desired_yg_in_mb=$((max_heap_size_in_mb / 4))
if [ "$desired_yg_in_mb" -gt "$max_sensible_yg_in_mb" ]
then
HEAP_NEWSIZE="${max_sensible_yg_in_mb}M"
else
HEAP_NEWSIZE="${desired_yg_in_mb}M"
fi
}
# Override these to set the amount of memory to allocate to the JVM at
# start-up. For production use you almost certainly want to adjust
# this for your environment. MAX_HEAP_SIZE is the total amount of
# memory dedicated to the Java heap; HEAP_NEWSIZE refers to the size
# of the young generation. Both MAX_HEAP_SIZE and HEAP_NEWSIZE should
# be either set or not (if you set one, set the other).
#
# The main trade-off for the young generation is that the larger it
# is, the longer GC pause times will be. The shorter it is, the more
# expensive GC will be (usually).
#
# The example HEAP_NEWSIZE assumes a modern 8-core+ machine for decent pause
# times. If in doubt, and if you do not particularly want to tweak, go with
# 100 MB per physical CPU core.
#MAX_HEAP_SIZE="4G"
#HEAP_NEWSIZE="800M"
if [ "x$MAX_HEAP_SIZE" = "x" ] && [ "x$HEAP_NEWSIZE" = "x" ]; then
calculate_heap_sizes
else
if [ "x$MAX_HEAP_SIZE" = "x" ] || [ "x$HEAP_NEWSIZE" = "x" ]; then
echo "please set or unset MAX_HEAP_SIZE and HEAP_NEWSIZE in pairs (see cassandra-env.sh)"
exit 1
fi
fi
# Specifies the default port over which Cassandra will be available for
# JMX connections.
JMX_PORT="7199"
# Here we create the arguments that will get passed to the jvm when
# starting cassandra.
# enable assertions. disabling this in production will give a modest
# performance benefit (around 5%).
JVM_OPTS="$JVM_OPTS -ea"
# add the jamm javaagent
check_openjdk=$(java -version 2>&1 | awk '{if (NR == 2) {print $1}}')
if [ "$check_openjdk" != "OpenJDK" ]
then
JVM_OPTS="$JVM_OPTS -javaagent:$CASSANDRA_HOME/lib/jamm-0.2.2.jar"
fi
# 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="$JVM_OPTS -Xmn${HEAP_NEWSIZE}"
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 -Xss128k"
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="$JVM_OPTS -Xloggc:/var/log/cassandra/gc-`date +%s`.log"
# uncomment to have Cassandra JVM listen for remote debuggers/profilers on port 1414
# JVM_OPTS="$JVM_OPTS -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1414"
# 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.)
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"