GitHub user zsxwing opened a pull request:

    https://github.com/apache/spark/pull/15163

    [SPARK-15698][SQL][STREAMING] Add the ability to remove the old MetadataLog 
in FileStreamSource (branch-2.0)

    ## What changes were proposed in this pull request?
    
    Backport #13513 to branch 2.0.
    
    ## How was this patch tested?
    
    Jenkins

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

    $ git pull https://github.com/zsxwing/spark SPARK-15698-spark-2.0

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

    https://github.com/apache/spark/pull/15163.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 #15163
    
----
commit 346def7c3895c1fe21dc7b51bdcc8dd06ed61fac
Author: jerryshao <ss...@hortonworks.com>
Date:   2016-09-20T17:24:12Z

    [SPARK-15698][SQL][STREAMING] Add the ability to remove the old MetadataLog 
in FileStreamSource
    
    Current `metadataLog` in `FileStreamSource` will add a checkpoint file in 
each batch but do not have the ability to remove/compact, which will lead to 
large number of small files when running for a long time. So here propose to 
compact the old logs into one file. This method is quite similar to 
`FileStreamSinkLog` but simpler.
    
    Unit test added.
    
    Author: jerryshao <ss...@hortonworks.com>
    
    Closes #13513 from jerryshao/SPARK-15698.
    
    (cherry picked from commit a6aade0042d9c065669f46d2dac40ec6ce361e63)
    Signed-off-by: Shixiong Zhu <shixi...@databricks.com>

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