GitHub user zjffdu opened a pull request:

    https://github.com/apache/zeppelin/pull/2455

    ZEPPELIN-1515. Notebook: HDFS as a backend storage (Read & Write Mode)

    ### What is this PR for?
    This PR is trying to add hdfs as another implementation for `NotebookRepo`. 
There's another PR about using webhdfs to implement that. Actually hdfs client 
library is compatibility cross major versions. See 
http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/Compatibility.html#Wire_compatibility
    
    This PR is also required for HA of zeppelin, so that multiple zeppelin 
instances can share notes via hdfs.  Besides I add hadoop-client in pom file. 
So zeppelin will package hadoop client jar into its binary distribution. This 
is because zeppelin may be installed in a gateway machine where no hadoop is 
installed (only hadoop configuration file is existed in this machine) 
    
    ### What type of PR is it?
    [Feature]
    
    ### Todos
    * [ ] - Task
    
    ### What is the Jira issue?
    * https://issues.apache.org/jira/browse/ZEPPELIN-1515
    
    ### How should this be tested?
    Unit test is added.  Also manually verify it in a single node cluster. 
    
    ### Screenshots (if appropriate)
    
    ### Questions:
    * Does the licenses files need update? No
    * Is there breaking changes for older versions? No
    * Does this needs documentation? No


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

    $ git pull https://github.com/zjffdu/zeppelin ZEPPELIN-1515

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

    https://github.com/apache/zeppelin/pull/2455.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 #2455
    
----
commit 2857369734d8eb698cde2286c49fdccfd6ed2eea
Author: Jeff Zhang <zjf...@apache.org>
Date:   2017-06-30T06:48:22Z

    ZEPPELIN-1515. Notebook: HDFS as a backend storage (Read & Write Mode)

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