Github user dhruve commented on a diff in the pull request:
https://github.com/apache/spark/pull/15370#discussion_r82181763
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala ---
@@ -93,19 +95,39 @@ private[spark] class ReliableCheckpointRDD[T: ClassTag](
* Read the content of the checkpoint file associated with the given
partition.
*/
override def compute(split: Partition, context: TaskContext):
Iterator[T] = {
- val file = new Path(checkpointPath,
ReliableCheckpointRDD.checkpointFileName(split.index))
+ val file = getPath(split)
ReliableCheckpointRDD.readCheckpointFile(file, broadcastedConf,
context)
}
+ /**
+ * Return the part file with current format by default. If not found,
check for part file with
+ * old format.
+ */
+ private def getPath(split: Partition): Path = {
+ val path = new Path(checkpointPath,
ReliableCheckpointRDD.checkpointFileName(split.index))
+ val fs = path.getFileSystem(broadcastedConf.value.value)
+
+ if (fs.exists(path)) {
+ path
+ } else {
+ val oldFormatPath =
+ new Path(checkpointPath,
+ ReliableCheckpointRDD.checkpointFileName(split.index, oldFormat
= true))
+ if (fs.exists(oldFormatPath)) oldFormatPath else path
+ }
+ }
+
}
private[spark] object ReliableCheckpointRDD extends Logging {
/**
- * Return the checkpoint file name for the given partition.
+ * Return the checkpoint file name for the given partition based on the
format requested.
+ * Old format is supported so that we can successfully parse previously
checkpointed files.
*/
- private def checkpointFileName(partitionIndex: Int): String = {
- "part-%05d".format(partitionIndex)
+ private def checkpointFileName(partitionIndex: Int, oldFormat: Boolean =
false): String = {
+ if (oldFormat) "part-%05d".format(partitionIndex) else
"part-%010d".format(partitionIndex)
--- End diff --
This is again required for getting the actual path to part file while
reconstructing the RDD. If we do not plan to parse the old code, we can default
it to 10 digits.
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