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https://issues.apache.org/jira/browse/CASSANDRA-12530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Roth resolved CASSANDRA-12530.
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Resolution: Fixed
Fixed by CASSANDRA-12689
> NPE in MutationStage after WriteTimeoutException
> ------------------------------------------------
>
> Key: CASSANDRA-12530
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12530
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths
> Reporter: Benjamin Roth
>
> I observed a situation where nodes seem to be overloaded by MV updates
> (probably). This produces tons of exceptions like the following.
> I guess the WriteTimeoutExceptions come from updates on remote hosts during
> the MV-write-path. So far so good - shit happens in an overloaded system. But
> the following NPE is probably not really intended and a follow-up exception
> of the timed out write.
> 2016-08-24T12:22:45+00:00 cas5 [MutationStage-25]
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught
> exception on thread Thread[MutationStage-25,5,main]: {}
> 2016-08-24T12:22:45+00:00 cas5
> #011org.apache.cassandra.exceptions.WriteTimeoutException: Operation timed
> out - received only 0 responses.
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.db.Keyspace.apply(Keyspace.java:486)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.db.Keyspace.lambda$apply$0(Keyspace.java:495)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109)
> 2016-08-24T12:22:45+00:00 cas5 #011at java.lang.Thread.run(Thread.java:745)
> 2016-08-24T12:22:45+00:00 cas5 [MutationStage-31]
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught
> exception on thread Thread[MutationStage-31,5,main]: {}
> 2016-08-24T12:22:45+00:00 cas5
> #011org.apache.cassandra.exceptions.WriteTimeoutException: Operation timed
> out - received only 0 responses.
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.db.Keyspace.apply(Keyspace.java:486)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.db.Keyspace.lambda$apply$0(Keyspace.java:495)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
> 2016-08-24T12:22:45+00:00 cas5 #011at
> org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109)
> 2016-08-24T12:22:45+00:00 cas5 #011at java.lang.Thread.run(Thread.java:745)
> 2016-08-24T12:22:45+00:00 cas5 [MutationStage-7]
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught
> exception on thread Thread[MutationStage-7,5,main]: {}
> 2016-08-24T12:22:45+00:00 cas5 #011java.lang.NullPointerException: null
> 2016-08-24T12:22:45+00:00 cas5 [MutationStage-32]
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught
> exception on thread Thread[MutationStage-32,5,main]: {}
> 2016-08-24T12:22:45+00:00 cas5 #011java.lang.NullPointerException: null
> 2016-08-24T12:22:45+00:00 cas5 [MutationStage-9]
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught
> exception on thread Thread[MutationStage-9,5,main]: {}
> 2016-08-24T12:22:45+00:00 cas5 #011java.lang.NullPointerException: null
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