GitHub user petermaxlee opened a pull request:

    https://github.com/apache/spark/pull/15126

    [SPARK-17513][SQL] Make StreamExecution garbage-collect its metadata

    ## What changes were proposed in this pull request?
    This PR modifies StreamExecution such that it discards metadata for batches 
that have already been fully processed. I used the purge method that was added 
as part of SPARK-17235.
    
    ## How was this patch tested?
    A new test case in StreamingQuerySuite. The test case would fail without 
the changes in this pull request.


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

    $ git pull https://github.com/petermaxlee/spark SPARK-17513

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

    https://github.com/apache/spark/pull/15126.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 #15126
    
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commit 8cc5e835b209d5796b044978ec4221ee22a8b9d2
Author: frreiss <frre...@us.ibm.com>
Date:   2016-09-08T19:59:15Z

    Added purge() call to scheduler

commit d71366d958334ebbc81e45c7f469bad2a68d0a2d
Author: frreiss <frre...@us.ibm.com>
Date:   2016-09-10T04:23:58Z

    Added test case and corrected off-by-one error.

commit 82f5b681c2e8e52f8549b21c7d058c497f2fc809
Author: frreiss <frre...@us.ibm.com>
Date:   2016-09-10T04:24:35Z

    Merge branch 'master' of https://github.com/apache/spark into fred-16963a

commit 6bd85faaf6cb5382f7c2a9d5a1b571281b8f6e62
Author: petermaxlee <petermax...@gmail.com>
Date:   2016-09-17T06:49:37Z

    Merge pull request #15067 from frreiss/fred-16963a
    
    [SPARK-17513] [STREAMING] [SQL] Make StreamExecution garbage-collect its 
metadata

commit 6b64d5cd222c70071faa7aebd8db191d5e1c0185
Author: petermaxlee <petermax...@gmail.com>
Date:   2016-09-17T07:16:28Z

    Fix test case.

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