Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/7279#discussion_r35392977
--- Diff: core/src/main/scala/org/apache/spark/rdd/LocalCheckpointRDD.scala
---
@@ -0,0 +1,67 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.rdd
+
+import scala.reflect.ClassTag
+
+import org.apache.spark.{Partition, SparkContext, SparkEnv,
SparkException, TaskContext}
+import org.apache.spark.storage.RDDBlockId
+
+/**
+ * A dummy CheckpointRDD that exists to provide informative error messages
during failures.
+ *
+ * This is simply a placeholder because the original checkpointed RDD is
expected to be
+ * fully cached. Only if an executor fails or if the user explicitly
unpersists the original
+ * RDD will Spark ever attempt to compute this CheckpointRDD. When this
happens, however,
+ * we must provide an informative error message.
+ *
+ * @param sc the active SparkContext
+ * @param rddId the ID of the checkpointed RDD
+ * @param partitionIndices the partition indices of the checkpointed RDD
+ */
+private[spark] class LocalCheckpointRDD[T: ClassTag](
+ @transient sc: SparkContext,
+ rddId: Int,
+ partitionIndices: Array[Int])
--- End diff --
Why do you need to take partitionIndices? Arent they always going to be 0
to numPartitions-1?
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