Github user jose-torres commented on a diff in the pull request:
https://github.com/apache/spark/pull/21337#discussion_r188829780
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/shuffle/UnsafeRowReceiver.scala
---
@@ -0,0 +1,56 @@
+/*
+ * 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.concurrent.{ArrayBlockingQueue, BlockingQueue}
+import java.util.concurrent.atomic.AtomicBoolean
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.rpc.{RpcCallContext, RpcEnv, ThreadSafeRpcEndpoint}
+import org.apache.spark.sql.catalyst.expressions.UnsafeRow
+
+/**
+ * Messages for the UnsafeRowReceiver endpoint. Either an incoming row or
an epoch marker.
+ */
+private[shuffle] sealed trait UnsafeRowReceiverMessage extends Serializable
+private[shuffle] case class ReceiverRow(row: UnsafeRow) extends
UnsafeRowReceiverMessage
+private[shuffle] case class ReceiverEpochMarker() extends
UnsafeRowReceiverMessage
+
+/**
+ * RPC endpoint for receiving rows into a continuous processing shuffle
task.
+ */
+private[shuffle] class UnsafeRowReceiver(val rpcEnv: RpcEnv)
+ extends ThreadSafeRpcEndpoint with Logging {
+ private val queue = new
ArrayBlockingQueue[UnsafeRowReceiverMessage](1024)
--- End diff --
There's actually an existing config I forgot to pull in. (I think it makes
sense to use the same config for all continuous read buffers unless and until
we see a need to split it.)
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