Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/9983#discussion_r45936910
--- Diff:
core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala ---
@@ -100,10 +107,52 @@ private[spark] object ReliableCheckpointRDD extends
Logging {
"part-%05d".format(partitionIndex)
}
+ private def checkpointPartitionerFileName(): String = {
+ "_partitioner"
+ }
+
/**
- * Write this partition's values to a checkpoint file.
+ * Write RDD to checkpoint files and return a ReliableCheckpointRDD
representing the RDD.
*/
- def writeCheckpointFile[T: ClassTag](
+ def createCheckpointedRDD[T: ClassTag](
+ originalRDD: RDD[T],
+ checkpointDir: String,
+ blockSize: Int = -1): ReliableCheckpointRDD[T] = {
+
+ val sc = originalRDD.sparkContext
+
+ // Create the output path for the checkpoint
+ val checkpointDirPath = new Path(checkpointDir)
+ val fs = checkpointDirPath.getFileSystem(sc.hadoopConfiguration)
+ if (!fs.mkdirs(checkpointDirPath)) {
+ throw new SparkException(s"Failed to create checkpoint path
$checkpointDirPath")
+ }
+
+ // Save to file, and reload it as an RDD
+ val broadcastedConf = sc.broadcast(
+ new SerializableConfiguration(sc.hadoopConfiguration))
+ // TODO: This is expensive because it computes the RDD again
unnecessarily (SPARK-8582)
+ sc.runJob(originalRDD,
+ writePartitionToCheckpointFile[T](checkpointDirPath.toString,
broadcastedConf) _)
+
+ if (originalRDD.partitioner.nonEmpty) {
+ writePartitionerToCheckpointDir(sc, originalRDD.partitioner.get,
checkpointDirPath)
+ }
+
+ val newRDD = new ReliableCheckpointRDD[T](
+ sc, checkpointDirPath.toString, originalRDD.partitioner)
+ if (newRDD.partitions.length != originalRDD.partitions.length) {
+ throw new SparkException(
+ s"Checkpoint RDD $newRDD(${newRDD.partitions.length}) has
different " +
+ s"number of partitions from original RDD
$originalRDD(${originalRDD.partitions.length})")
+ }
+ newRDD
+ }
+
+ /**
+ * Write a RDD partition's data to a checkpoint file.
+ */
+ def writePartitionToCheckpointFile[T: ClassTag](
--- End diff --
private
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