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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