zhijiang created FLINK-7394:

             Summary: Implement basic InputChannel for credit-based logic
                 Key: FLINK-7394
                 URL: https://issues.apache.org/jira/browse/FLINK-7394
             Project: Flink
          Issue Type: Sub-task
          Components: Core
            Reporter: zhijiang
            Assignee: zhijiang
             Fix For: 1.4.0

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

The basic works are:

* The exclusive buffers per channel are assigned to {{RemoteInputChannel}} 
directly during registering task.
* {{RemoteInputChannel}} implements {{BufferRecycler}} interface to manage the 
exclusive buffers itself.
* {{RemoteInputChannel}} implements {{BufferPoolListener}} interface to be 
notified available floating buffers from buffer pool.
* {{RemoteInputChannel}} maintains unannounced credit and current sender 

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