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https://issues.apache.org/jira/browse/FLINK-2504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14681076#comment-14681076
 ] 

Sachin Goel commented on FLINK-2504:
------------------------------------

I couldn't find the failed job but found a gist I had created for the stack 
trace. The failure was in the same test file, but on a different test: 
{{testSortWithLongRecordsOnly}}. [Should this be on a separate JIRA then?]
Here's the stack trace though:
{{
Running org.apache.flink.runtime.operators.sort.ExternalSortLargeRecordsITCase
java.lang.RuntimeException: Error obtaining the sorted input: Thread 
'SortMerger Reading Thread' terminated due to an exception: Cannot allocate 
memory
        at 
org.apache.flink.runtime.operators.sort.UnilateralSortMerger.getIterator(UnilateralSortMerger.java:607)
        at 
org.apache.flink.runtime.operators.sort.ExternalSortLargeRecordsITCase.testSortWithLongRecordsOnly(ExternalSortLargeRecordsITCase.java:135)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
Caused by: java.io.IOException: Thread 'SortMerger Reading Thread' terminated 
due to an exception: Cannot allocate memory
        at 
org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ThreadBase.run(UnilateralSortMerger.java:785)
Caused by: java.io.IOException: Cannot allocate memory
        at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
        at sun.nio.ch.FileDispatcherImpl.write(FileDispatcherImpl.java:60)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
        at sun.nio.ch.IOUtil.write(IOUtil.java:65)
        at sun.nio.ch.FileChannelImpl.write(FileChannelImpl.java:210)
        at 
org.apache.flink.runtime.io.disk.iomanager.SegmentWriteRequest.write(AsynchronousFileIOChannel.java:340)
        at 
org.apache.flink.runtime.io.disk.iomanager.IOManagerAsync$WriterThread.run(IOManagerAsync.java:471)
Tests run: 4, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 136.721 sec <<< 
FAILURE! - in 
org.apache.flink.runtime.operators.sort.ExternalSortLargeRecordsITCase
testSortWithLongRecordsOnly(org.apache.flink.runtime.operators.sort.ExternalSortLargeRecordsITCase)
  Time elapsed: 34.892 sec  <<< FAILURE!
java.lang.AssertionError: Error obtaining the sorted input: Thread 'SortMerger 
Reading Thread' terminated due to an exception: Cannot allocate memory
        at org.junit.Assert.fail(Assert.java:88)
        at 
org.apache.flink.runtime.operators.sort.ExternalSortLargeRecordsITCase.testSortWithLongRecordsOnly(ExternalSortLargeRecordsITCase.java:155)
}}

> ExternalSortLargeRecordsITCase.testSortWithLongAndShortRecordsMixed failed 
> spuriously
> -------------------------------------------------------------------------------------
>
>                 Key: FLINK-2504
>                 URL: https://issues.apache.org/jira/browse/FLINK-2504
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Till Rohrmann
>
> The test 
> {{ExternalSortLargeRecordsITCase.testSortWithLongAndShortRecordsMixed}} 
> failed in one of my Travis builds: 
> https://travis-ci.org/tillrohrmann/flink/jobs/74881883



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