viirya commented on a change in pull request #25856: [SPARK-29182][Core] Cache
preferred locations of checkpointed RDD
URL: https://github.com/apache/spark/pull/25856#discussion_r326929052
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File path: core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala
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@@ -82,14 +83,28 @@ private[spark] class ReliableCheckpointRDD[T: ClassTag](
Array.tabulate(inputFiles.length)(i => new CheckpointRDDPartition(i))
}
+ // Cache of preferred locations of checkpointed files.
+ private[spark] val cachedPreferredLocations: mutable.HashMap[Int,
Seq[String]] =
+ mutable.HashMap.empty
Review comment:
getPreferredLocations only takes the hostnames from one BlockLocation for
each partition. The number of hostnames depends on the block replicas on DFS.
So if block replicas is 3, we cache 3 hostname strings for each partition.
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