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From "Mike (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-12185) Exception during metrics calculation
Date Wed, 13 Jul 2016 06:44:20 GMT
Mike created CASSANDRA-12185:

             Summary: Exception during metrics calculation
                 Key: CASSANDRA-12185
             Project: Cassandra
          Issue Type: Bug
          Components: Observability
         Environment: Ubuntu 14.04, Java 1.8.0_91, metrics-graphite-3.1.2
            Reporter: Mike

I am trying to report Cassandra metrics to Graphite server using metrics-graphite. When there
is no load on the cluster everything works fine and all metrics are reported properly. But
if some load occurs, I receive following exception in system.log:

ERROR [metrics-graphite-reporter-1-thread-1] 2016-07-13 08:21:23,580
- RuntimeException thrown from GraphiteReporter#report. Exception was suppressed.
java.lang.IllegalStateException: Unable to compute ceiling for max when histogram overflowed
        at org.apache.cassandra.utils.EstimatedHistogram.rawMean(
        at org.apache.cassandra.metrics.EstimatedHistogramReservoir$HistogramSnapshot.getMean(
        at com.codahale.metrics.graphite.GraphiteReporter.reportHistogram(
        at ~[metrics-core-3.1.0.jar:3.1.0]
        at com.codahale.metrics.ScheduledReporter$ ~[metrics-core-3.1.0.jar:3.1.0]
        at java.util.concurrent.Executors$ [na:1.8.0_91]
        at java.util.concurrent.FutureTask.runAndReset( [na:1.8.0_91]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(
        at java.util.concurrent.ScheduledThreadPoolExecutor$
        at java.util.concurrent.ThreadPoolExecutor.runWorker(
        at java.util.concurrent.ThreadPoolExecutor$
        at [na:1.8.0_91]

This message is repeated every second on every Cassandra node and some metrics become unavailable.
In order to receive the metrics again, I have to restart all Cassandra nodes.

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