zhijiang created FLINK-7456:
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Summary: 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
Fix For: 1.4.0
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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