zhengruifeng opened a new pull request #24870: [SPARK-27018][Core] Fix incorrect removal of checkpointed file in PeriodicCheckpointer URL: https://github.com/apache/spark/pull/24870 ## What changes were proposed in this pull request? remove the oldest checkpointed file only if next checkpoint exists. I think this patch needs back-porting. ## How was this patch tested? existing test local check in spark-shell with following suite: ``` import org.apache.spark.ml.linalg.Vectors import org.apache.spark.ml.classification.GBTClassifier case class Row(features: org.apache.spark.ml.linalg.Vector, label: Int) sc.setCheckpointDir("/checkpoints") val trainingData = sc.parallelize(1 to 2426874, 256).map(x => Row(Vectors.dense(x, x + 1, x * 2 % 10), if (x % 5 == 0) 1 else 0)).toDF val classifier = new GBTClassifier() .setLabelCol("label") .setFeaturesCol("features") .setProbabilityCol("probability") .setMaxIter(100) .setMaxDepth(10) .setCheckpointInterval(2) classifier.fit(trainingData) ```
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