Github user arunmahadevan commented on a diff in the pull request: https://github.com/apache/spark/pull/21337#discussion_r188392937 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/shuffle/ContinuousShuffleReadRDD.scala --- @@ -0,0 +1,64 @@ +/* + * 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.shuffle + +import java.util.UUID + +import org.apache.spark.{Partition, SparkContext, SparkEnv, TaskContext} +import org.apache.spark.rdd.RDD +import org.apache.spark.sql.catalyst.expressions.UnsafeRow +import org.apache.spark.util.NextIterator + +case class ContinuousShuffleReadPartition(index: Int) extends Partition { + // Initialized only on the executor, and only once even as we call compute() multiple times. + lazy val (receiver, endpoint) = { + val env = SparkEnv.get.rpcEnv + val receiver = new UnsafeRowReceiver(env) + val endpoint = env.setupEndpoint(UUID.randomUUID().toString, receiver) + TaskContext.get().addTaskCompletionListener { ctx => + env.stop(endpoint) + } + (receiver, endpoint) + } +} + +/** + * RDD at the bottom of each continuous processing shuffle task, reading from the --- End diff -- incomplete comment? Bottom is a bit ambiguous. Can we explicitly state whats at the bottom (reader or writer) and if this receiving the shuffle data from downstream ?
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