248 lines
9.2 KiB
Groff
248 lines
9.2 KiB
Groff
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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calculate_heap_sizes()
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{
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case "`uname`" in
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Linux)
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system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'`
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system_cpu_cores=`egrep -c 'processor([[:space:]]+):.*' /proc/cpuinfo`
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;;
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FreeBSD)
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system_memory_in_bytes=`sysctl hw.physmem | awk '{print $2}'`
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system_memory_in_mb=`expr $system_memory_in_bytes / 1024 / 1024`
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system_cpu_cores=`sysctl hw.ncpu | awk '{print $2}'`
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;;
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SunOS)
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system_memory_in_mb=`prtconf | awk '/Memory size:/ {print $3}'`
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system_cpu_cores=`psrinfo | wc -l`
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;;
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Darwin)
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system_memory_in_bytes=`sysctl hw.memsize | awk '{print $2}'`
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system_memory_in_mb=`expr $system_memory_in_bytes / 1024 / 1024`
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system_cpu_cores=`sysctl hw.ncpu | awk '{print $2}'`
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;;
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*)
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# assume reasonable defaults for e.g. a modern desktop or
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# cheap server
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system_memory_in_mb="2048"
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system_cpu_cores="2"
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;;
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esac
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# some systems like the raspberry pi don't report cores, use at least 1
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if [ "$system_cpu_cores" -lt "1" ]
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then
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system_cpu_cores="1"
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fi
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# set max heap size based on the following
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# max(min(1/2 ram, 1024MB), min(1/4 ram, 8GB))
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# calculate 1/2 ram and cap to 1024MB
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# calculate 1/4 ram and cap to 8192MB
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# pick the max
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half_system_memory_in_mb=`expr $system_memory_in_mb / 2`
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quarter_system_memory_in_mb=`expr $half_system_memory_in_mb / 2`
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if [ "$half_system_memory_in_mb" -gt "1024" ]
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then
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half_system_memory_in_mb="1024"
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fi
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if [ "$quarter_system_memory_in_mb" -gt "8192" ]
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then
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quarter_system_memory_in_mb="8192"
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fi
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if [ "$half_system_memory_in_mb" -gt "$quarter_system_memory_in_mb" ]
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then
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max_heap_size_in_mb="$half_system_memory_in_mb"
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else
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max_heap_size_in_mb="$quarter_system_memory_in_mb"
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fi
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MAX_HEAP_SIZE="${max_heap_size_in_mb}M"
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# Young gen: min(max_sensible_per_modern_cpu_core * num_cores, 1/4 * heap size)
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max_sensible_yg_per_core_in_mb="100"
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max_sensible_yg_in_mb=`expr $max_sensible_yg_per_core_in_mb "*" $system_cpu_cores`
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desired_yg_in_mb=`expr $max_heap_size_in_mb / 4`
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if [ "$desired_yg_in_mb" -gt "$max_sensible_yg_in_mb" ]
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then
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HEAP_NEWSIZE="${max_sensible_yg_in_mb}M"
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else
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HEAP_NEWSIZE="${desired_yg_in_mb}M"
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fi
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}
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# Determine the sort of JVM we'll be running on.
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java_ver_output=`"${JAVA:-java}" -version 2>&1`
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jvmver=`echo "$java_ver_output" | awk -F'"' 'NR==1 {print $2}'`
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JVM_VERSION=${jvmver%_*}
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JVM_PATCH_VERSION=${jvmver#*_}
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jvm=`echo "$java_ver_output" | awk 'NR==2 {print $1}'`
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case "$jvm" in
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OpenJDK)
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JVM_VENDOR=OpenJDK
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# this will be "64-Bit" or "32-Bit"
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JVM_ARCH=`echo "$java_ver_output" | awk 'NR==3 {print $2}'`
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;;
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"Java(TM)")
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JVM_VENDOR=Oracle
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# this will be "64-Bit" or "32-Bit"
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JVM_ARCH=`echo "$java_ver_output" | awk 'NR==3 {print $3}'`
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;;
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*)
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# Help fill in other JVM values
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JVM_VENDOR=other
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JVM_ARCH=unknown
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;;
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esac
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# Override these to set the amount of memory to allocate to the JVM at
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# start-up. For production use you may wish to adjust this for your
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# environment. MAX_HEAP_SIZE is the total amount of memory dedicated
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# to the Java heap; HEAP_NEWSIZE refers to the size of the young
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# generation. Both MAX_HEAP_SIZE and HEAP_NEWSIZE should be either set
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# or not (if you set one, set the other).
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#
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# The main trade-off for the young generation is that the larger it
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# is, the longer GC pause times will be. The shorter it is, the more
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# expensive GC will be (usually).
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#
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# The example HEAP_NEWSIZE assumes a modern 8-core+ machine for decent pause
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# times. If in doubt, and if you do not particularly want to tweak, go with
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# 100 MB per physical CPU core.
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#MAX_HEAP_SIZE="4G"
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#HEAP_NEWSIZE="800M"
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if [ "x$MAX_HEAP_SIZE" = "x" ] && [ "x$HEAP_NEWSIZE" = "x" ]; then
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calculate_heap_sizes
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else
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if [ "x$MAX_HEAP_SIZE" = "x" ] || [ "x$HEAP_NEWSIZE" = "x" ]; then
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echo "please set or unset MAX_HEAP_SIZE and HEAP_NEWSIZE in pairs (see cassandra-env.sh)"
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exit 1
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fi
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fi
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# Specifies the default port over which Cassandra will be available for
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# JMX connections.
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JMX_PORT="7199"
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# Here we create the arguments that will get passed to the jvm when
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# starting cassandra.
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# enable assertions. disabling this in production will give a modest
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# performance benefit (around 5%).
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JVM_OPTS="$JVM_OPTS -ea"
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# add the jamm javaagent
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if [ "$JVM_VENDOR" != "OpenJDK" -o "$JVM_VERSION" \> "1.6.0" ] \
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|| [ "$JVM_VERSION" = "1.6.0" -a "$JVM_PATCH_VERSION" -ge 23 ]
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then
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JVM_OPTS="$JVM_OPTS -javaagent:$CASSANDRA_HOME/lib/jamm-0.2.5.jar"
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fi
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# enable thread priorities, primarily so we can give periodic tasks
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# a lower priority to avoid interfering with client workload
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JVM_OPTS="$JVM_OPTS -XX:+UseThreadPriorities"
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# allows lowering thread priority without being root. see
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# http://tech.stolsvik.com/2010/01/linux-java-thread-priorities-workaround.html
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JVM_OPTS="$JVM_OPTS -XX:ThreadPriorityPolicy=42"
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# min and max heap sizes should be set to the same value to avoid
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# stop-the-world GC pauses during resize, and so that we can lock the
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# heap in memory on startup to prevent any of it from being swapped
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# out.
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JVM_OPTS="$JVM_OPTS -Xms${MAX_HEAP_SIZE}"
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JVM_OPTS="$JVM_OPTS -Xmx${MAX_HEAP_SIZE}"
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JVM_OPTS="$JVM_OPTS -Xmn${HEAP_NEWSIZE}"
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JVM_OPTS="$JVM_OPTS -XX:+HeapDumpOnOutOfMemoryError"
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# set jvm HeapDumpPath with CASSANDRA_HEAPDUMP_DIR
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if [ "x$CASSANDRA_HEAPDUMP_DIR" != "x" ]; then
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JVM_OPTS="$JVM_OPTS -XX:HeapDumpPath=$CASSANDRA_HEAPDUMP_DIR/cassandra-`date +%s`-pid$$.hprof"
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fi
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startswith() { [ "${1#$2}" != "$1" ]; }
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if [ "`uname`" = "Linux" ] ; then
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# reduce the per-thread stack size to minimize the impact of Thrift
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# thread-per-client. (Best practice is for client connections to
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# be pooled anyway.) Only do so on Linux where it is known to be
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# supported.
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# u34 and greater need 180k
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JVM_OPTS="$JVM_OPTS -Xss512k"
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fi
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echo "xss = $JVM_OPTS"
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# GC tuning options
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JVM_OPTS="$JVM_OPTS -XX:+UseParNewGC"
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JVM_OPTS="$JVM_OPTS -XX:+UseConcMarkSweepGC"
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JVM_OPTS="$JVM_OPTS -XX:+CMSParallelRemarkEnabled"
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JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=8"
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JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=1"
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JVM_OPTS="$JVM_OPTS -XX:CMSInitiatingOccupancyFraction=75"
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JVM_OPTS="$JVM_OPTS -XX:+UseCMSInitiatingOccupancyOnly"
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JVM_OPTS="$JVM_OPTS -XX:+UseTLAB"
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# note: bash evals '1.7.x' as > '1.7' so this is really a >= 1.7 jvm check
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if [ "$JVM_VERSION" \> "1.7" ] ; then
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JVM_OPTS="$JVM_OPTS -XX:+UseCondCardMark"
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fi
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# GC logging options -- uncomment to enable
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JVM_OPTS="$JVM_OPTS -XX:+PrintGCDetails"
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JVM_OPTS="$JVM_OPTS -XX:+PrintGCDateStamps"
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JVM_OPTS="$JVM_OPTS -XX:+PrintHeapAtGC"
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JVM_OPTS="$JVM_OPTS -XX:+PrintTenuringDistribution"
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JVM_OPTS="$JVM_OPTS -XX:+PrintGCApplicationStoppedTime"
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JVM_OPTS="$JVM_OPTS -XX:+PrintPromotionFailure"
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JVM_OPTS="$JVM_OPTS -XX:PrintFLSStatistics=1"
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JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc-`date +%s`.log"
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# If you are using JDK 6u34 7u2 or later you can enable GC log rotation
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# don't stick the date in the log name if rotation is on.
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# JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc.log"
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# JVM_OPTS="$JVM_OPTS -XX:+UseGCLogFileRotation"
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# JVM_OPTS="$JVM_OPTS -XX:NumberOfGCLogFiles=10"
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# JVM_OPTS="$JVM_OPTS -XX:GCLogFileSize=10M"
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# uncomment to have Cassandra JVM listen for remote debuggers/profilers on port 1414
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# JVM_OPTS="$JVM_OPTS -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1414"
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# Prefer binding to IPv4 network intefaces (when net.ipv6.bindv6only=1). See
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# http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342561 (short version:
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# comment out this entry to enable IPv6 support).
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JVM_OPTS="$JVM_OPTS -Djava.net.preferIPv4Stack=true"
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# jmx: metrics and administration interface
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#
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# add this if you're having trouble connecting:
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# JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<public name>"
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#
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# see
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# https://blogs.oracle.com/jmxetc/entry/troubleshooting_connection_problems_in_jconsole
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# for more on configuring JMX through firewalls, etc. (Short version:
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# get it working with no firewall first.)
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JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.port=$JMX_PORT"
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JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=false"
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JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
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JVM_OPTS="$JVM_OPTS $JVM_EXTRA_OPTS"
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