Github user ericl commented on a diff in the pull request:
https://github.com/apache/spark/pull/18714#discussion_r128913707
--- Diff:
core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala
---
@@ -52,12 +55,22 @@ class HadoopMapReduceCommitProtocol(jobId: String,
path: String)
*/
@transient private var addedAbsPathFiles: mutable.Map[String, String] =
null
+ @transient private var partitionPaths: mutable.Set[String] = null
+
+ @transient private var stagingDir: Path = _
--- End diff --
I mean, we can turn stagingDir into `private def stagingDir` or a private
variable in a function.
Similarly, `partitionPaths` can be computed as
`filesToMove.map(_.getPath).distinct` during the commit phase.
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