[GitHub] flink pull request #4533: [FLINK-7416][network] Implement Netty receiver out...

[pnowojski <gi...@git.apache.org>]

Github user pnowojski commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4533#discussion_r151931122
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/CreditBasedClientHandler.java ---
    @@ -322,22 +322,25 @@ private void writeAndFlushNextMessageIfPossible(Channel channel) {
     		while (true) {
     			RemoteInputChannel inputChannel = inputChannelsWithCredit.poll();
     
    -			// The input channel may be null because of the write callbacks that are executed
    -			// after each write, and it is also no need to notify credit for released channel.
    -			if (inputChannel == null || inputChannel.isReleased()) {
    +			// The input channel may be null because of the write callbacks
    +			// that are executed after each write.
    +			if (inputChannel == null) {
     				return;
     			}
     
    -			AddCredit msg = new AddCredit(
    -				inputChannel.getPartitionId(),
    -				inputChannel.getAndResetCredit(),
    -				inputChannel.getInputChannelId());
    +			//It is no need to notify credit for the released channel.
    +			if (!inputChannel.isReleased()) {
    +				AddCredit msg = new AddCredit(
    +					inputChannel.getPartitionId(),
    +					inputChannel.getAndResetCredit(),
    +					inputChannel.getInputChannelId());
     
    -			// Write and flush and wait until this is done before
    -			// trying to continue with the next input channel.
    -			channel.writeAndFlush(msg).addListener(writeListener);
    +				// Write and flush and wait until this is done before
    +				// trying to continue with the next input channel.
    +				channel.writeAndFlush(msg).addListener(writeListener);
     
    -			return;
    +				return;
    --- End diff --
    
    Ok, I get it now :)


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