GitHub user XuPingyong opened a pull request:

    [FLINK-7423] Always reuse an instance to get elements from the inputFormat

    ## What is the purpose of the change
    This pull request fix a bug about getting elements from the inputFormat in
    ## Verifying this change
    This change added tests and can be verified as follows:
      - *Added test in InputFormatSourceFunctionTest*
    ## 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)

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

    $ git pull FLINK-7423

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 #4525
commit ddca0f9d258eed4bc69bf931aebc1bbde385c799
Author: pingyong.xpy <>
Date:   2017-08-11T06:09:12Z

    [FLINK-7423] Always reuse an instance to get elements from the inputFormat


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