Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11865#discussion_r60151689
--- Diff: core/src/main/scala/org/apache/spark/rdd/CoalescedRDDPublic.scala
---
@@ -0,0 +1,50 @@
+/*
+ * 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.collection.mutable
+
+import org.apache.spark.annotation.DeveloperApi
+import org.apache.spark.Partition
+
+/**
+ * A PartitionCoalescer defines how to coalesce the partitions of a given
RDD.
+ */
+@DeveloperApi
+trait PartitionCoalescer {
+
+ /**
+ * Coalesce the partitions of the given RDD.
+ *
+ * @param maxPartitions the maximum number of partitions to have after
coalescing
+ * @param parent the parent RDD whose partitions to coalesce
+ * @return an array of [[PartitionGroup]]s, where each element is itself
an array of
+ * [[Partition]]s and represents a partition after coalescing is
performed.
+ */
+ def coalesce(maxPartitions: Int, parent: RDD[_]): Array[PartitionGroup]
+}
+
+/**
+ * A group of [[Partition]]s
+ * @param prefLoc preferred location for the partition group
+ */
+@DeveloperApi
+class PartitionGroup(val prefLoc: Option[String] = None) {
+ var arr = mutable.ArrayBuffer[Partition]()
--- End diff --
arr -> partitions
also can this be a val?
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