[GitHub] [hadoop] smarthanwang commented on a change in pull request #3645: HADOOP-17998. Enable get command run with multi-thread.

[GitBox <gi...@apache.org>]

smarthanwang commented on a change in pull request #3645:
URL: https://github.com/apache/hadoop/pull/3645#discussion_r752825112



##########
File path: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/CopyCommandWithMultiThread.java
##########
@@ -0,0 +1,157 @@
+/**
+ * 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.hadoop.fs.shell;
+
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.classification.VisibleForTesting;
+
+/**
+ * Abstract command to enable sub copy commands run with multi-thread.
+ */
+public abstract class CopyCommandWithMultiThread
+    extends CommandWithDestination {
+
+  private int threadCount = 1;
+  private ThreadPoolExecutor executor = null;
+  private int threadPoolQueueSize = DEFAULT_QUEUE_SIZE;
+
+  public static final int DEFAULT_QUEUE_SIZE = 1024;
+  public static final int MAX_THREAD_COUNT =
+      Runtime.getRuntime().availableProcessors() * 2;

Review comment:
       I agree with you, no limit is the best way. I set the limit just for keep same  with the original limit. I will cancel it.




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