Cassandra upgrade sample script

cassandra_upgrade.sh

#!/bin/bash
set -e #fail on error

function log {
    echo "[`date`] $@"
}

log "Upgrading cassandra. Press <ENTER> to continue.."
read

log "Creating snapshots"
nodetool -h localhost -p 7199 snapshot -t upgrade

log "Draining node"
nodetool -h localhost -p 7199 drain
sleep 10

#Disable auxiliary services such as metrics collector, monit, opscenter, etc

log "Stopping old cassandra.."
/bin/ps -ef | /bin/grep -E "javaagent.*cassandra" | /bin/grep -v grep | /usr/bin/awk '{print $2}' | /usr/bin/xargs kill -9
sleep 2

log "Removing saved caches"
rm -rf /mnt/cassandra/saved_caches/

log "Waiting for information to propagate between nodes..."
sleep 60

log "Starting new cassandra.."
/opt/cassandra-1.2.10/bin/cassandra

#Re-enable auxiliary services such as metrics collector, monit, opscenter, etc