Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15370#discussion_r82142674
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala ---
@@ -72,7 +72,8 @@ private[spark] class ReliableCheckpointRDD[T: ClassTag](
.sortBy(_.toString)
// Fail fast if input files are invalid
inputFiles.zipWithIndex.foreach { case (path, i) =>
- if
(!path.toString.endsWith(ReliableCheckpointRDD.checkpointFileName(i))) {
+ if (path.getName != ReliableCheckpointRDD.checkpointFileName(i) &
--- End diff --
You may be right that you can assume this code won't encounter files with
older shorter split numbers. But it seems easier to just look for a file name
ending in "part-[0-9]+" here rather than special case an "old format"
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