GitHub user jkbradley opened a pull request:

    https://github.com/apache/spark/pull/20592

    [SPARK-23154][ML][DOC] Document backwards compatibility guarantees for ML 
persistence

    ## What changes were proposed in this pull request?
    
    Added documentation about what MLlib guarantees in terms of loading ML 
models and Pipelines from old Spark versions.  Discussed & confirmed on linked 
JIRA.

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

    $ git pull https://github.com/jkbradley/spark 
SPARK-23154-backwards-compat-doc

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

    https://github.com/apache/spark/pull/20592.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 #20592
    
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commit 5366d169ca6b1c5f590ad1beaa15ac74cf731234
Author: Joseph K. Bradley <joseph@...>
Date:   2018-02-13T00:35:17Z

    added backwards compatibility notes to ML pipeline persistence docs

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