GitHub user yew1eb opened a pull request:

    https://github.com/apache/flink/pull/4519

    [FLINK-7415][Cassandra Connector] Add comments for `BatchExample.java`

    ## What is the purpose of the change
    Help beginners follow it with less confusion. 
    
    ## Brief change log
    - Add comments for cassandra batch-test class `BatchExample.java`
    
    ## Verifying this change
    
    
    
    ## 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 https://github.com/yew1eb/flink FLINK-7415

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

    https://github.com/apache/flink/pull/4519.patch

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

    This closes #4519
    
----
commit 62fbc338f5049bebd5b770f66938b9394677dbe9
Author: yew1eb <yew...@gmail.com>
Date:   2017-08-10T15:28:00Z

    add comments for BatchExample.java

----


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