Cassandra 2.2.4 startup

startup.md

:
# Ensure that the queing behavior on our cassandra block device is
# tuned for ssd
for disk in $(blockdev --report | grep -v xvda | grep '/dev' | cut -d/ -f3) ; do
    echo 1 > /sys/block/$disk/queue/nomerges # SSD only! 0 on HDD
    echo 8 > /sys/block/$disk/queue/read_ahead_kb
done

# Use the TSC as the clock source instead of xen
echo "tsc" >  /sys/devices/system/clocksource/clocksource0/current_clocksource

# Leave a CPU free for the OS
MAX_CPU=$(grep 'processor' /proc/cpuinfo | tail -1  | cut -d':' -f2 | sed 's/^ //')

START_TIME=$(date +%s)
# This is based on what the datastax community cassandra 2.2.4 looks like when it's started:
# This is based on what the datastax community cassandra 2.2.4 looks like when it's started:
chrt --batch 0 \
taskset -c 1-${MAX_CPU} \
sudo -u cassandra \
  java \
    -ea \
    -javaagent:/opt/apache-cassandra-2.2.4-SNAPSHOT/lib/jamm-0.3.0.jar \
    -XX:+UseG1GC \
    -XX:+ParallelRefProcEnabled \
    -XX:ParallelGCThreads=6 \
    -XX:ConcGCThreads=6 \
    -XX:MaxGCPauseMillis=500 \
    -XX:G1RSetUpdatingPauseTimePercent=5 \
    -XX:InitiatingHeapOccupancyPercent=25 \
    -XX:G1HeapRegionSize=32m \
    -XX:+AlwaysPreTouch \
    -XX:-UseBiasedLocking \
    -XX:+UseTLAB -XX:+ResizeTLAB \
    -XX:+UseNUMA \
    -XX:+UseThreadPriorities \
    -XX:ThreadPriorityPolicy=42 \
    -Xms8G \
    -Xmx8G \
    -XX:+HeapDumpOnOutOfMemoryError \
    -Xss256k \
    -XX:StringTableSize=1000003 \
    -XX:SurvivorRatio=8 \
    -XX:MaxTenuringThreshold=1 \
    -XX:+PerfDisableSharedMem \
    -XX:+UseCondCardMark \
    -XX:+PrintGCDetails \
    -XX:+PrintGCDateStamps \
    -XX:+PrintHeapAtGC \
    -XX:+PrintTenuringDistribution \
    -XX:+PrintGCApplicationStoppedTime \
    -XX:+PrintPromotionFailure \
    -XX:PrintFLSStatistics=1 \
    -Xloggc:/var/log/cassandra/gc.log \
    -XX:+UseGCLogFileRotation \
    -XX:NumberOfGCLogFiles=10 \
    -XX:GCLogFileSize=10M \
    -Djava.net.preferIPv4Stack=true \
    -Dcassandra.jmx.local.port=7199 \
    -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=/dev/null \
    -XX:+DisableExplicitGC \
    -Djava.library.path=/opt/apache-cassandra-2.2.4-SNAPSHOT/lib/sigar-bin \
    -Dlogback.configurationFile=logback.xml \
    -Dcassandra.libjemalloc=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1 \
    -Dcassandra.logdir=/var/log/cassandra \
    -Dcassandra.storagedir= \
    -Dcassandra.metricsReporterConfigFile=metrics.yaml \
    -cp /etc/cassandra:/opt/apache-cassandra-2.2.4-SNAPSHOT/lib/*:/opt/apache-cassandra-2.2.4-SNAPSHOT/*: \
    -XX:HeapDumpPath=/var/lib/cassandra/ \
    -XX:ErrorFile=/var/lib/cassandra/hs_err_$START_TIME.log \
    org.apache.cassandra.service.CassandraDaemon