GitHub user dding3 opened a pull request:

    [SPARK-17559][MLLIB]persist edges if their storage level is non in 

    ## What changes were proposed in this pull request?
    When use PeriodicGraphCheckpointer to persist graph, sometimes the edges 
isn't persisted. As currently only when vertices's storage level is none, graph 
is persisted. However there is a chance vertices's storage level is not none 
while edges's is none. Eg. graph created by a outerJoinVertices operation, 
vertices is automatically cached while edges is not. In this way, edges will 
not be persisted if we use PeriodicGraphCheckpointer do persist. We need 
separately check edges's storage level and persisted it if it's none.
    ## How was this patch tested?
     manual tests

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

    $ git pull spark-persisitEdge

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

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

    This closes #15124
commit bf94b4dbcc4e8e0602715dce92f5053608674b43
Author: ding <ding@localhost.localdomain>
Date:   2016-09-16T17:04:27Z

    persist edges if their storage level is non in PeriodicGraphCheckpointer


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