GitHub user zhijiangW opened a pull request:

    [FLINK-7378][core]Implement the FixedBufferPool for floating buffers of 

    ## What is the purpose of the change
    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 
    ## Brief change log
      - *Implemented a new fixed size buffer pool type*
      - *Added a `BufferPoolListener` interface for notifying buffer 
availability more than once, this can replace the current `EventListener` in 
`BufferProvider` interface later*
      - *Distinguished the fixed buffer pools and redistributed buffer pools in 
    ## Verifying this change
    This change added tests and can be verified as follows:
      - *Added `FixedBufferPoolTest` for verifying this new buffer pool 
      - *Modified the existing `NetworkBufferPoolTest` and 
`BufferPoolFactoryTest` for verifying creating fixed buffer pool and 
redistribute the available buffers in `NetworkBufferPool`*
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): (no)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
    ## Documentation
      - Does this pull request introduce a new feature? (no)
      - If yes, how is the feature documented? (not applicable)

You can merge this pull request into a Git repository by running:

    $ git pull FLINK-7378

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4485
commit 5c7a27f6fdd215150174c7827cc87b5ea08e01bc
Author: Zhijiang <>
Date:   2017-08-07T09:31:17Z

    [FLINK-7378][core]Implement the FixedBufferPool for floating buffers of 


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