zhijiang created FLINK-7468:
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Summary: Implement Netty sender backlog logic for credit-based
Key: FLINK-7468
URL: https://issues.apache.org/jira/browse/FLINK-7468
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.
Receivers should know how many buffers are available on the sender side (the
backlog). The receivers use this information to decide how to distribute
floating buffers.
The {{ResultSubpartition}} maintains the backlog which only indicates the
number of buffers in this subpartition, not including the number of events. The
backlog is increased for adding buffer to this subpartition, and decreased for
polling buffer from it.
The backlog is attached in {{BufferResponse}} by sender as an absolute value
after the buffer being transferred.
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