Github user jaceklaskowski commented on the issue:

    https://github.com/apache/spark/pull/16309
  
    @srowen Please help as I'm stuck with the `OutOfMemoryError: GC overhead 
limit exceeded` error. Should Jenkins run the tests with 6g?
    
    What's even more interesting is that the tests seem to have all passed 
according to the report in [Test build #70306 has 
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/70306/testReport/).
    
    BTW, I'm running the tests on my laptop with the following settings `export 
SBT_OPTS="-Xmx6g -XX:ReservedCodeCacheSize=512m"` (as recommended).
    
    ```
    Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded
        at 
scala.collection.TraversableLike$class.withFilter(TraversableLike.scala:655)
        at 
scala.collection.AbstractTraversable.withFilter(Traversable.scala:104)
        at 
scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$scoping$2$.getMerged(GenASM.scala:2067)
        at 
scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genLocalVariableTable$1(GenASM.scala:2112)
        at 
scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genCode(GenASM.scala:2753)
        at 
scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genMethod(GenASM.scala:1471)
    ```


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