Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/11327#discussion_r54115176
--- Diff: core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala ---
@@ -192,7 +192,8 @@ private class PartitionCoalescer(maxPartitions: Int,
prev: RDD[_], balanceSlack:
def resetIterator(): Iterator[(String, Partition)] = {
val iterators = (0 to 2).map( x =>
prev.partitions.iterator.flatMap(p => {
- if (currPrefLocs(p).size > x) Some((currPrefLocs(p)(x), p)) else
None
+ val locs = currPrefLocs(p)
+ if (locs.size > x) Some((locs(x), p)) else None
--- End diff --
Are you sure on this? Overall I'm fine with changing but just want to
understand for future.
locs here is a Seq
From scaladoc:
The size of this sequence, equivalent to length
scala doc says length on sequence also says:
Note: will not terminate for infinite-sized collections.
Looking at the scala source code:
https://github.com/scala/scala/blob/2.10.x/src/library/scala/collection/SeqLike.scala#L106
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