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https://issues.apache.org/jira/browse/FLINK-7456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326433#comment-16326433
 ] 

ASF GitHub Bot commented on FLINK-7456:
---------------------------------------

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

    https://github.com/apache/flink/pull/4552#discussion_r161559642
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/netty/PartitionRequestQueueTest.java
 ---
    @@ -71,4 +77,95 @@ public void testProducerFailedException() throws 
Exception {
                NettyMessage.ErrorResponse err = (NettyMessage.ErrorResponse) 
msg;
                assertTrue(err.cause instanceof CancelTaskException);
        }
    +
    +   /**
    +    * Tests {@link 
PartitionRequestQueue#enqueueAvailableReader(SequenceNumberingViewReader)},
    +    * verifying the reader would be enqueued in the pipeline if the next 
sending buffer is event, even
    +    * though it has no available credits.
    +    */
    +   @Test
    +   public void testEnqueueReaderByNotifyingEventBuffer() throws Exception {
    +           // setup
    +           final ResultSubpartitionView view = 
mock(ResultSubpartitionView.class);
    --- End diff --
    
    let's remove that mock ...


> Implement Netty sender incoming pipeline for credit-based
> ---------------------------------------------------------
>
>                 Key: FLINK-7456
>                 URL: https://issues.apache.org/jira/browse/FLINK-7456
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>            Reporter: zhijiang
>            Assignee: zhijiang
>            Priority: Major
>             Fix For: 1.5.0
>
>
> This is a part of work for credit-based network flow control.
> On sender side, each subpartition view maintains an atomic integer 
> {{currentCredit}} from receiver. Once receiving the messages of 
> {{PartitionRequest}} and {{AddCredit}}, the {{currentCredit}} is added by 
> deltas.
> Each view also maintains an atomic boolean field to mark it as registered 
> available for transfer to make sure it is enqueued in handler only once. If 
> the {{currentCredit}} increases from zero and there are available buffers in 
> the subpartition, the corresponding view will be enqueued for transferring 
> data.



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