Github user xuanyuanking commented on a diff in the pull request: https://github.com/apache/spark/pull/21560#discussion_r195415777 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousCoalesceRDD.scala --- @@ -0,0 +1,93 @@ +/* + * 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.sql.execution.streaming.continuous + +import org.apache.spark._ +import org.apache.spark.rdd.{CoalescedRDDPartition, RDD} +import org.apache.spark.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.expressions.UnsafeRow +import org.apache.spark.sql.execution.streaming.continuous.shuffle._ + +case class ContinuousCoalesceRDDPartition(index: Int) extends Partition { + private[continuous] var writersInitialized: Boolean = false +} + +/** + * RDD for continuous coalescing. Asynchronously writes all partitions of `prev` into a local + * continuous shuffle, and then reads them in the task thread using `reader`. + */ +class ContinuousCoalesceRDD(var reader: ContinuousShuffleReadRDD, var prev: RDD[InternalRow]) --- End diff -- why the `reader` and `prev` both is var here?
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