[GitHub] yanghua commented on a change in pull request #6544: [FLINK-8532] [Streaming] modify RebalancePartitioner to use a random partition as its first partition

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yanghua commented on a change in pull request #6544: [FLINK-8532] [Streaming] modify RebalancePartitioner to use a random partition as its first partition
URL: https://github.com/apache/flink/pull/6544#discussion_r209517591
 
 

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 File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/partitioner/RebalancePartitioner.java
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 @@ -36,9 +38,13 @@
 	@Override
 	public int[] selectChannels(SerializationDelegate<StreamRecord<T>> record,
 			int numberOfOutputChannels) {
-		int newChannel = ++this.returnArray[0];
-		if (newChannel >= numberOfOutputChannels) {
-			this.returnArray[0] = 0;
+		if (this.returnArray[0] < 0) {
+			this.returnArray[0] = new Random().nextInt(numberOfOutputChannels);
 
 Review comment:
   May be use  `ThreadLocalRandom.current().nextInt` would be better than `new Random().nextInt`. Even if you use `Random` class, there is no need to create it every time, when calling this method.

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