#! /bin/bash

#This Plug-in monitors Cassandra ConcurrentMarkSweep Garbage Collection happening in particuler duration ;
# This take four  parameters as input
# 1) -d Duration within which the count needs to be monitores (in seconds )
# 2)  -f Log file location of cassandra status.log
# 3) Warning Value
# 4)Critical Values.

# Author - Juned Memon

# Please make sure your log entry for CMS GC is like
# " INFO [ScheduledTasks:1] 2011-10-21 00:09:22,753 GCInspector.java (line 128) GC for ConcurrentMarkSweep: 15828 ms, 11324439288 reclaimed leaving 1007293704 used; max is 17232297984"

#Otherwise adjust the coloumns to be cut in line where varibale TIME is poppulated.

#########THIS part is for Nagios ################################
PROGNAME=`/usr/bin/basename $0`
PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`
REVISION=`echo '$Revision: 1749 $' | sed -e 's/[^0-9.]//g'`
#. $PROGPATH/utils.sh
.  /usr/local/nagios/libexec/utils.sh


######################################################################

#Function to print Usage
function usage
{
usage="Usage: $0 -d <Duration> -f <LOGFILE> -w <WARN>] [-c <CRIT>"
echo $usage
usage="<DURATION> is Duration within which the count needs to be monitores (in seconds ) ; Default:900 seconds (15 minutes)"
echo $usage
usage="<LOGFILE> is location of Cassandra Log file. Default is /BigData/lib/cassandra/log/system.log"
echo $usage
usage="<WARN> is Rate/second for  WARNing state   Default is 9."
echo $usage
usage="<CRIT> is Rate/second for Critical  state  Default is 15."
echo $usage

exit $STATE_UNKNOWN
}


WARN=9
CRIT=15
DURATION=900 # in seconds
#####################################################################
# get parameter values in Variables

while test -n "$1"; do
    case "$1" in
        -c )
            CRIT=$2
            shift
            ;;
        -w )
            WARN=$2
            shift
            ;;
       -d )
            DURATION=$2
            shift
            ;;
       -f )
           FILE=$2
            shift
            ;;


        -h)
            usage
            ;;
        *)
            echo "Unknown argument: $1"
            usage
            ;;
    esac
    shift
done

#####################################################################

CURR_EPOCH=$(date +%s )
START_EPOCH=`expr $CURR_EPOCH - $DURATION`

COUNT=0
COUNTER=1
LOG_FILE="/BigData/lib/cassandra/log/system.log"

STATUS=1

while [  $STATUS -eq 1 ]; do

TIME=$( grep ConcurrentMarkSweep $LOG_FILE | tail -n $COUNTER | head -n 1 |cut -d " " -f4,5 | cut -d "," -f1)

TIME_E=$( date --date "$TIME" +%s)

#3echo "Last log entry was at $var i.e. $V_var (epcch time)"
#echo "Last log entry was at $var1 i.e. $V_var1 (epcch time)"

#DIFF=$(echo "$V_var-$V_var1" | bc)

if [ $TIME_E -gt $START_EPOCH ]
then
COUNT=`expr $COUNT + 1`
COUNTER=`expr $COUNTER + 1`

STATUS=1
else

STATUS=0
fi

done

echo "$COUNT ConcurrentMarkSweep Garbage Collection Occoured in last $DURATION seconds."



####################################################################################
#if CRIT > COUNT >WARN then WARNing
if [ $COUNT -ge $WARN ]; then
if [ $COUNT -lt $CRIT ]; then
exitstatus=$STATE_WARNING
exit $exitstatus
fi
fi
# COUNT>CRIT then CRITical
if [ $COUNT -ge $CRIT ]; then
exitstatus=$STATE_CRITICAL
exit $exitstatus
fi

# 0<=COUNT <WARN
if [ $COUNT -le $WARN ]; then
exitstatus=$STATE_OK
exit $exitstatus
fi