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[CORE] [MINOR] Improve the error message of checkpoint RDD verification #18796

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[CORE] [MINOR] Improve the error message of checkpoint RDD verification #18796

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6 changes: 4 additions & 2 deletions core/src/main/scala/org/apache/spark/rdd/ReliableCheckpointRDD.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -152,8 +152,10 @@ private[spark] object ReliableCheckpointRDD extends Logging {
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})")
"Checkpoint RDD has a different number of partitions from original RDD. Original " +
s"RDD [ID: ${originalRDD.id}, num of partitions: ${originalRDD.partitions.length}]; " +
s"Checkpoint RDD [ID: ${newRDD.id}, num of partitions: " +
s"${newRDD.partitions.length}].")
}
newRDD
}
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