Github user guowei2 commented on the pull request:
https://github.com/apache/spark/pull/1291#issuecomment-48006575
when numPartitioner is set to 0, HashPartitioner would not be failed
,because getPartition method would not be called.
here is the DAGScheduler's code
if (partitions.size == 0) {
return new JobWaiter[U](this, jobId, 0, resultHandler)
}
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