Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/1291#discussion_r14498076
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/dstream/ShuffledDStream.scala
---
@@ -39,8 +39,10 @@ class ShuffledDStream[K: ClassTag, V: ClassTag, C:
ClassTag](
override def compute(validTime: Time): Option[RDD[(K,C)]] = {
parent.getOrCompute(validTime) match {
- case Some(rdd) => Some(rdd.combineByKey[C](
- createCombiner, mergeValue, mergeCombiner, partitioner,
mapSideCombine))
+ case Some(rdd) => {
+ Some(if (rdd.partitions.length==0)
rdd.combineByKey(createCombiner, mergeValue, mergeCombiner,0)
--- End diff --
Hi @guowei2 , two quick questions:
1. Is there any situation where partitions will be 0?
2. I don't think `numPartitions` can be set to 0, since HashPartitioner
will be failed if `Mod 0`.
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