[GitHub] [flink] rkhachatryan commented on a change in pull request #10939: [FLINK-15750][network] Moving output flushing to the mailbox

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rkhachatryan commented on a change in pull request #10939: [FLINK-15750][network] Moving output flushing to the mailbox
URL: https://github.com/apache/flink/pull/10939#discussion_r370694018
 
 

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 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/io/OutputFlusher.java
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 @@ -0,0 +1,125 @@
+/*
+ * 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.flink.streaming.runtime.io;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.io.network.api.writer.RecordWriter;
+import org.apache.flink.streaming.api.operators.MailboxExecutor;
+import org.apache.flink.util.FlinkException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.concurrent.Future;
+
+/**
+ * A dedicated thread that periodically flushes the output buffers, to set upper latency bounds.
+ *
+ * <p>The thread is daemonic, because it is only a utility thread.
+ */
+public class OutputFlusher extends Thread {
+	/** Default name for the output flush thread, if no name with a task reference is given. */
+	@VisibleForTesting
+	public static final String OUTPUT_FLUSH_THREAD_NAME = "OutputFlusher";
+
+	private static final Logger LOG = LoggerFactory.getLogger(OutputFlusher.class);
+
+	private final RecordWriter<?> recordWriter;
+	private final long timeout;
+	private final MailboxExecutor mailboxExecutor;
+
+	private volatile boolean running = true;
+
+	public OutputFlusher(
+			RecordWriter<?> recordWriter,
+			String taskName,
+			long timeout,
+			MailboxExecutor mailboxExecutor) {
+		super(OUTPUT_FLUSH_THREAD_NAME + " for " + taskName);
+		this.recordWriter = recordWriter;
+		this.timeout = timeout;
+		this.mailboxExecutor = mailboxExecutor;
+		setDaemon(true);
+	}
+
+	public void terminate() {
+		running = false;
+		interrupt();
+	}
+
+	@Override
+	public void run() {
+		try {
+			Future<?> future = null;
+
+			while (running) {
+				try {
+					if (future != null) {
 
 Review comment:
   Isn't it always false?

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