Github user dongeforever commented on a diff in the pull request:
https://github.com/apache/incubator-rocketmq/pull/138#discussion_r140401564
--- Diff:
client/src/main/java/org/apache/rocketmq/client/producer/selector/SelectMessageQueueByConsistentHash.java
---
@@ -0,0 +1,132 @@
+/*
+ * 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.rocketmq.client.producer.selector;
+
+import org.apache.rocketmq.client.producer.MessageQueueSelector;
+import org.apache.rocketmq.common.message.Message;
+import org.apache.rocketmq.common.message.MessageQueue;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.SortedMap;
+import java.util.TreeMap;
+
+/**
+* wanting to send a message with the same key combine with orderly
consumer, user can
+* use the implements of the MessageQueueSelector, which has one
optimization compared with SelectMessageQueueByHash
+* when a broker crash , it can reduce the message Arriving out of the order
+*/
+public class SelectMessageQueueByConsistentHash implements
MessageQueueSelector {
+
+ private volatile SortedMap<Integer, String> virtualNodes =
--- End diff --
how about just using <Integer, MessageQueue>?
---
