Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/4984#issuecomment-101344959
I tested this on a 3-node Mesos cluster (as before) and everything looked
fine:
spark-defaults.conf:
```
spark.mesos.coarse true
spark.shuffle.service.enabled true
spark.dynamicAllocation.enabled true
spark.dynamicAllocation.minExecutors 1
spark.dynamicAllocation.maxExecutors 3
spark.dynamicAllocation.executorIdleTimeout 15
```
in spark-shell:
```
val rdd = sc.parallelize(1 to 10000000, 500)
val rdd1 = rdd.zipWithIndex.groupBy(_._1 / 100)
rdd1.cache()
rdd1.collect()
```
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