Cassandra node rebalancing script

rebalance.sh

#!/bin/sh

#this looks up the nodes from the ring and rebalances them automatically

hosts = `/usr/bin/nodetool ring |grep Normal |awk '{print $1}' |xargs echo`

RING_SIZE=$(echo "2^127" | bc)

HOST_NUM=$(echo $hosts | wc -w)
INDEX=0

for host in $hosts
do
    token=$(echo "$INDEX*$RING_SIZE/$HOST_NUM" | bc)
    if [[ $token -ne 0 ]]; then 
        /usr/bin/nodetool -h $host move $token
    fi
    INDEX=$((INDEX+1))
done