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https://issues.apache.org/jira/browse/SPARK-18986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16081995#comment-16081995
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Gili Nachum commented on SPARK-18986:
-------------------------------------
I'm currently using 2.11, and this was fixed in 2.2.0 (not released yet).
The workaround I used (might help others) was to increase the # of partitions
to avoid the buggy spill altogether.
> ExternalAppendOnlyMap shouldn't fail when forced to spill before calling its
> iterator
> -------------------------------------------------------------------------------------
>
> Key: SPARK-18986
> URL: https://issues.apache.org/jira/browse/SPARK-18986
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Fix For: 2.2.0
>
>
> {{ExternalAppendOnlyMap.forceSpill}} now uses an assert to check if an
> iterator is not null in the map. However, the assertion is only true after
> the map is asked for iterator. Before it, if another memory consumer asks
> more memory than currently available, {{ExternalAppendOnlyMap.forceSpill}} is
> also be called too. In this case, we will see failure like this:
> {code}
> [info] java.lang.AssertionError: assertion failed
> [info] at scala.Predef$.assert(Predef.scala:156)
> [info] at
> org.apache.spark.util.collection.ExternalAppendOnlyMap.forceSpill(ExternalAppendOnlyMap.scala:196)
> [info] at
> org.apache.spark.util.collection.Spillable.spill(Spillable.scala:111)
> [info] at
> org.apache.spark.util.collection.ExternalAppendOnlyMapSuite$$anonfun$13.apply$mcV$sp(ExternalAppendOnly
> MapSuite.scala:294)
> {code}
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