Cassandra NoSQL quick+dirty watchdog script

cassandra-watchdog

#!/bin/sh

    test "$(systemctl is-active cassandra)" = "active" || exit 0

pid="$(systemctl show -p MainPID --value cassandra)"

    test "$pid" = ""         && exit 0
    test "$pid" = "0"        && exit 0

UPTIME="$(ps -o etimes:1 --no-headers -p $pid)"

    test "$UPTIME" = ""      && exit 0
    test "$UPTIME" -lt "600" && exit 0

ACTIVE="$(timeout 20 nodetool -Dcom.sun.jndi.rmiURLParsing=legacy info | egrep -c 'active *: true')"

    test "$ACTIVE" -ge 3     && exit 0

logger -p user.notice -t "${0##*/}" -- "restart"

    systemctl restart cassandra

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