[jira] [Resolved] (SPARK-16193) Address flaky ExternalAppendOnlyMapSuite spilling tests

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-16193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-16193.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.1
                   1.6.3

Issue resolved by pull request 13896
[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
>             Fix For: 1.6.3, 2.0.1
>
>
> 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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