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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-945) Iterations sometimes release memory prematurely
Date Tue, 17 Jun 2014 16:33:24 GMT
Stephan Ewen created FLINK-945:
----------------------------------

             Summary: Iterations sometimes release memory prematurely
                 Key: FLINK-945
                 URL: https://issues.apache.org/jira/browse/FLINK-945
             Project: Flink
          Issue Type: Bug
            Reporter: Stephan Ewen


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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