GitHub user sihuazhou opened a pull request:

    Fix incorrect description in the document for externalized checkpoint…

    ## What is the purpose of the change
    This PR addressed issue 
[FLINK-8657]( I checked that 
external checkpoint also supported rescale both in code and practice. But in 
the doc it still note that "do not support Flink specific features like 
    ## Brief change log
    - Fix incorrect description for externalized checkpoint vs savepoint.
    - Fix incorrect description for memory state backend.
    ## Verifying this change
    This change is already covered by existing tests.
    ## 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)
      - The S3 file system connector: (no)
    ## Documentation
      - Does this pull request introduce a new feature? (no)

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with (at least) the following in the commit message:

    This closes #5490
commit cf0bc52a36b4d65ac2a474f22efbddc8e46251c1
Author: summerleafs <summerleafs@...>
Date:   2018-02-14T15:21:02Z

    Fix incorrect description in the document for externalized checkpoints and 
memory state backend.



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