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Poor Man's Monitoring for Solr

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Poor Man's Monitoring for Solr

· Java Zone
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Learn how to troubleshoot and diagnose some of the most common performance issues in Java today. Brought to you in partnership with AppDynamics.

As well as being the developer and PR agent for jetwick, sadly I'm also the admin ;-) . All in one... at once. Here is a minor snippet to get an alert email if your Solr index is either not available or contains too few entries. You'll  get a resolved mail if all is fine again.


cd /path/
FILE=bla.log
EMAILS="your@email.here"
SUBJECT="OK: jetwick"
STATUS=OK

CNT=`wget --http-user=user --http-password=password -T 10 -q "http://your-host.com/solr/select?q=&rows=1&wt=json" -O - | tr ',' '\n' |grep numFound|tr ':' ' '|awk '{print $3}'`
if [ "x$CNT" == x ] || [ "$CNT" -lt 500000 ]; then
SUBJECT="CRITICAL: check http://your-host.com/solr"
STATUS=CRITICAL
fi

PREV_STAT=`cat .status`

if [ "$STATUS" == "CRITICAL" ]; then
if [ "$PREV_STAT" == "OK" ]; then
cat $FILE | mail $EMAILS -a $FILE -s "$SUBJECT. doc count was only $CNT"
fi
echo CRITICAL > .status
else
if [ "$PREV_STAT" == "CRITICAL" ]; then
cat $FILE | mail $EMAILS -a $FILE -s "SOLVED: http://your-host.com/solr"
fi
echo OK > .status
fi

echo $STATUS > .status

add via this via crontab -e

*/2 * * * * /path/check-health.sh

If you look at the code there is one mini hack which is necessary if the solr index is down and the CNT is empty:

"x$CNT" == x

From http://karussell.wordpress.com/2010/11/25/poor-men-monitoring-for-solr/

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