[jira] [Created] (CASSANDRA-8629) Exceptions in cassandra-stress

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-8629:
--------------------------------------------

             Summary: Exceptions in cassandra-stress
                 Key: CASSANDRA-8629
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8629
             Project: Cassandra
          Issue Type: Bug
            Reporter: Aleksey Yeschenko
            Assignee: Benedict
            Priority: Trivial


cassandra-stress when run with tiny n, throws org.apache.commons.math3.exception.NotStrictlyPositiveException.

Now, n=1 doesn't really make any sense, w/ 50k writes used just for warmup, but an exception is still an exception. Labeled w/ priority: Trivial.

Profile used: http://pastebin.com/raw.php?i=9U5EMdVq

{noformat}
tools/bin/cassandra-stress user profile=partition.yaml ops\(insert=1\) n=1 -rate threads=50

INFO  18:21:59 Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
Connected to cluster: Test Cluster
Datatacenter: datacenter1; Host: localhost/127.0.0.1; Rack: rack1
INFO  18:21:59 New Cassandra host localhost/127.0.0.1:9042 added
Created schema. Sleeping 1s for propagation.
Exception in thread "main" org.apache.commons.math3.exception.NotStrictlyPositiveException: standard deviation (0)
	at org.apache.commons.math3.distribution.NormalDistribution.<init>(NormalDistribution.java:108)
	at org.apache.cassandra.stress.settings.OptionDistribution$GaussianFactory.get(OptionDistribution.java:418)
	at org.apache.cassandra.stress.generate.SeedManager.<init>(SeedManager.java:59)
	at org.apache.cassandra.stress.settings.SettingsCommandUser.getFactory(SettingsCommandUser.java:78)
	at org.apache.cassandra.stress.StressAction.run(StressAction.java:61)
	at org.apache.cassandra.stress.Stress.main(Stress.java:109)
{noformat}

On cassandra-2.1 HEAD, I cannot reproduce it, but get a different exception, with n=10:

{noformat}
Exception in thread "Thread-13" java.lang.AssertionError
	at org.apache.cassandra.stress.util.DynamicList.remove(DynamicList.java:156)
	at org.apache.cassandra.stress.generate.Seed.remove(Seed.java:83)
	at org.apache.cassandra.stress.generate.SeedManager.markLastWrite(SeedManager.java:115)
	at org.apache.cassandra.stress.generate.PartitionIterator$MultiRowIterator.setHasNext(PartitionIterator.java:561)
	at org.apache.cassandra.stress.generate.PartitionIterator$MultiRowIterator.seek(PartitionIterator.java:333)
	at org.apache.cassandra.stress.generate.PartitionIterator$MultiRowIterator.reset(PartitionIterator.java:242)
	at org.apache.cassandra.stress.generate.PartitionIterator.reset(PartitionIterator.java:99)
	at org.apache.cassandra.stress.Operation.ready(Operation.java:110)
	at org.apache.cassandra.stress.StressAction$Consumer.run(StressAction.java:288)
{noformat}



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