zhijiang created FLINK-7416:

             Summary: Implement Netty receiver outgoing pipeline for 
                 Key: FLINK-7416
                 URL: https://issues.apache.org/jira/browse/FLINK-7416
             Project: Flink
          Issue Type: Sub-task
          Components: Network
            Reporter: zhijiang
            Assignee: zhijiang
             Fix For: 1.4.0

This is a part of work for credit-based network flow control.

The related works are :

* The {{InputChannel}} notifies the initial credit which equals to the number 
of exclusive buffers per channel via {{PartitionRequest}} message.
*  We define another message called {{AddCredit}} to notify the incremental 
credit during data shuffle. 
* Whenever an {{InputChannel}}’s unannounced credit goes up from zero, the 
channel is enqueued in the pipeline.
* Whenever the channel becomes writable, it takes the next {{InputChannel}} and 
sends its unannounced credit. The credit is reset to zero after each sent.
* That way, messages are sent as often as the network has capacity and contain 
as much credit as available for the channel at that point in time. Otherwise, 
it would only add latency to the announcements and not increase throughput.

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