Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/15814#discussion_r87111758
--- Diff:
core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala
---
@@ -42,17 +44,21 @@ class HadoopMapReduceCommitProtocol(jobId: String,
path: String)
/** OutputCommitter from Hadoop is not serializable so marking it
transient. */
@transient private var committer: OutputCommitter = _
+ /**
+ * Tracks files staged by this task for absolute output paths. These
outputs are not managed by
+ * the Hadoop OutputCommitter, so we must move these to their final
locations on job commit.
+ */
+ @transient private var addedAbsPathFiles: mutable.Map[String, String] =
null
--- End diff --
They are files. We need to track the unique output location of each file
here in order to know where to place it. We could use directories, but they
would end up with one file each anyways.
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