zhijiang created FLINK-7378:

             Summary: Implement the FixedBufferPool for floating buffers of 
                 Key: FLINK-7378
                 URL: https://issues.apache.org/jira/browse/FLINK-7378
             Project: Flink
          Issue Type: Sub-task
          Components: Core
            Reporter: zhijiang
            Assignee: zhijiang
             Fix For: 1.4.0

Currently the number of network buffers in {{LocalBufferPool}} for 
{{SingleInputGate}} is limited by {{a * <number of channels> + b}}, where a is 
the number of exclusive buffers for each channel and b is the number of 
floating buffers shared by all channels.

Considering the credit-based flow control feature, we want to implement a new 
fixed size buffer pool type used to manage the floating buffers for 

Compared with {{LocalBufferPool}}, this is a non-rebalancing buffer pool which 
will not participate in redistributing the left available buffers in 

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