Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/8280#issuecomment-132345128
The diff I'm proposing is something like
```
+ val numShuffleDeps =
rdd.dependencies.filter(_.isInstanceOf[ShuffleDependency[_, _, _]]).length
+
// If the RDD has shuffle dependencies and shuffle locality is
enabled, pick locations that
// have at least REDUCER_PREF_LOCS_FRACTION of data as preferred
locations
- if (shuffleLocalityEnabled && rdd.partitions.length <
SHUFFLE_PREF_REDUCE_THRESHOLD) {
+ if (numShuffleDeps == 1 && shuffleLocalityEnabled &&
+ rdd.partitions.length < SHUFFLE_PREF_REDUCE_THRESHOLD) {
```
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