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https://issues.apache.org/jira/browse/FLINK-945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073168#comment-14073168
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Janani Chakkaradhari commented on FLINK-945:
--------------------------------------------
Stephan: I just found that I am facing this exception only for a particular
data set and for others data sets the program works fine.
I sent you the code to your email and also the link for the data set for which
I am still facing this exception. Now I am not sure whether this exception is
caused by the data or stratosphere.
> Iterations sometimes release memory prematurely
> -----------------------------------------------
>
> Key: FLINK-945
> URL: https://issues.apache.org/jira/browse/FLINK-945
> Project: Flink
> Issue Type: Bug
> Components: Iterations, Local Runtime
> Affects Versions: 0.6-incubating, pre-apache-0.5.2
> Reporter: Stephan Ewen
> Priority: Critical
>
> It seems that the iteration tail is sometimes releasing the memory
> prematurely, causing still working operations to fail.
> {code}
> java.lang.NullPointerException
> at eu.stratosphere.core.memory.MemorySegment.put(MemorySegment.java:186)
> at
> eu.stratosphere.nephele.services.memorymanager.AbstractPagedOutputView.writeByte(AbstractPagedOutputView.java:214)
> at
> eu.stratosphere.nephele.services.memorymanager.AbstractPagedOutputView.write(AbstractPagedOutputView.java:167)
> at eu.stratosphere.types.Record.serialize(Record.java:1208)
> at
> eu.stratosphere.api.java.typeutils.runtime.record.RecordSerializer.serialize(RecordSerializer.java:79)
> at
> eu.stratosphere.api.java.typeutils.runtime.record.RecordSerializer.serialize(RecordSerializer.java:27)
> at
> eu.stratosphere.pact.runtime.iterative.io.WorksetUpdateOutputCollector.collect(WorksetUpdateOutputCollector.java:52)
> at
> eu.stratosphere.test.recordJobs.kmeans.KMeansBroadcast$RecomputeClusterCenter.reduce(KMeansBroadcast.java:255)
> at
> eu.stratosphere.pact.runtime.task.GroupReduceDriver.run(GroupReduceDriver.java:103)
> at
> eu.stratosphere.pact.runtime.task.RegularPactTask.run(RegularPactTask.java:505)
> at
> eu.stratosphere.pact.runtime.iterative.task.AbstractIterativePactTask.run(AbstractIterativePactTask.java:132)
> at
> eu.stratosphere.pact.runtime.iterative.task.IterationTailPactTask.run(IterationTailPactTask.java:100)
> at
> eu.stratosphere.pact.runtime.task.RegularPactTask.invoke(RegularPactTask.java:370)
> at
> eu.stratosphere.nephele.execution.RuntimeEnvironment.run(RuntimeEnvironment.java:284)
> at java.lang.Thread.run(Thread.java:744)
> {code}
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