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https://issues.apache.org/jira/browse/SPARK-16193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348598#comment-15348598
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Apache Spark commented on SPARK-16193:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/13896
> Address flaky ExternalAppendOnlyMapSuite spilling tests
> -------------------------------------------------------
>
> Key: SPARK-16193
> URL: https://issues.apache.org/jira/browse/SPARK-16193
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, Tests
> Affects Versions: 2.0.0
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
>
> We've seen tests fail, for different codecs and operations, like so, most
> recently from 2.0.0 RC1:
> {code}
> - spilling with compression *** FAILED ***
> java.lang.Exception: Test failed with compression using codec
> org.apache.spark.io.LZ4CompressionCodec:
> assertion failed: expected groupByKey to spill, but did not
> at scala.Predef$.assert(Predef.scala:170)
> at org.apache.spark.TestUtils$.assertSpilled(TestUtils.scala:170)
> at
> org.apache.spark.util.collection.ExternalAppendOnlyMapSuite.org$apache$spark$util$collection$ExternalAppendOnlyMapSuite$$testSimpleSpilling(ExternalAppendOnlyMapSuite.scala:253)
> at
> org.apache.spark.util.collection.ExternalAppendOnlyMapSuite$$anonfun$10$$anonfun$apply$mcV$sp$8.apply(ExternalAppendOnlyMapSuite.scala:218)
> at
> org.apache.spark.util.collection.ExternalAppendOnlyMapSuite$$anonfun$10$$anonfun$apply$mcV$sp$8.apply(ExternalAppendOnlyMapSuite.scala:216)
> at scala.collection.immutable.Stream.foreach(Stream.scala:594)
> ...
> {code}
> My theory is that the listener doesn't receive notification of the spilled
> stages early enough to show up in the test. It should wait until the job is
> done before letting the test proceed to query the number of spilled stages.
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