zhijiang commented on FLINK-7377:

repeated in [FLINK-7378|https://issues.apache.org/jira/browse/FLINK-7378]

> Implement FixedBufferPool for floating buffers in SingleInputGate
> -----------------------------------------------------------------
>                 Key: FLINK-7377
>                 URL: https://issues.apache.org/jira/browse/FLINK-7377
>             Project: Flink
>          Issue Type: Task
>          Components: Core
>    Affects Versions: 1.4.0
>            Reporter: zhijiang
>            Assignee: zhijiang
> 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 
> {{SingleInputGate}}. 
> Compared with {{LocalBufferPool}}, this is a non-rebalancing buffer pool 
> which will not participate in redistributing the left available buffers in 
> {{NetworkBufferPool}}.

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