Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/2450#discussion_r17799318
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -872,7 +872,12 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
hadoopConf.set("mapred.output.compression.codec", c.getCanonicalName)
hadoopConf.set("mapred.output.compression.type",
CompressionType.BLOCK.toString)
}
- hadoopConf.setOutputCommitter(classOf[FileOutputCommitter])
+
+ // Useful on EMR where direct output committer is set by default
--- End diff --
For this comment I'd make it more general:
```
// Use existing output committer if already set
```
I'm guessing over time we'll run into many formats that require this.
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