pnowojski commented on a change in pull request #7051: [FLINK-10820][network] 
Simplify the RebalancePartitioner implementation
URL: https://github.com/apache/flink/pull/7051#discussion_r236226605
 
 

 ##########
 File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/api/writer/RecordWriterTest.java
 ##########
 @@ -412,23 +412,24 @@ public void testBroadcastEmitRecord() throws Exception {
         *
         * @param isBroadcastEmit whether using {@link 
RecordWriter#broadcastEmit(IOReadableWritable)} or not
         */
+       @SuppressWarnings("unchecked")
        private void 
emitRecordWithBroadcastPartitionerOrBroadcastEmitRecord(boolean 
isBroadcastEmit) throws Exception {
                final int numChannels = 4;
                final int bufferSize = 32;
                final int numValues = 8;
                final int serializationLength = 4;
 
-               @SuppressWarnings("unchecked")
                final Queue<BufferConsumer>[] queues = new Queue[numChannels];
                for (int i = 0; i < numChannels; i++) {
                        queues[i] = new ArrayDeque<>();
                }
 
                final TestPooledBufferProvider bufferProvider = new 
TestPooledBufferProvider(Integer.MAX_VALUE, bufferSize);
                final ResultPartitionWriter partitionWriter = new 
CollectingPartitionWriter(queues, bufferProvider);
+               final ChannelSelector selector = new Broadcast<>();
+               selector.setup(numChannels);
 
 Review comment:
   Won't this be called inside `RecordWriter`'s constructor?

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