Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18714#discussion_r128921077 --- Diff: core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala --- @@ -53,6 +65,18 @@ class HadoopMapReduceCommitProtocol(jobId: String, path: String) @transient private var addedAbsPathFiles: mutable.Map[String, String] = null /** + * Tracks partitions with default path that have new files written into it by this task, + * e.g. a=1/b=2. Files under these partitions will be saved into staging directory and moved to + * destination directory at the end, if `runtimeOverwritePartition` is true. + */ + @transient private var partitionPaths: mutable.Set[String] = null --- End diff -- cc @ericl , `addedAbsPathFiles` only tracks partitions with custom path, we still need this `partitionPaths` to track partitions with default path
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