[GitHub] spark pull request: [SPARK][SPARK-10842]Eliminate create duplicate...

Sat, 26 Sep 2015 06:15:36 -0700 

GitHub user suyanNone opened a pull request:

    https://github.com/apache/spark/pull/8923

    [SPARK][SPARK-10842]Eliminate create duplicate stage while generate job dag

    When we traverse RDD, to generate Stage DAG, Spark will skip judge the 
stage whether it add into shuffleIdToStage in some condition: get shuffleDep 
from getAncestorShuffleDependency
    
    Before:
    
![before1](https://cloud.githubusercontent.com/assets/9818852/10117739/9e1e8778-6493-11e5-935d-ea32099e94c9.png)
    
![before2](https://cloud.githubusercontent.com/assets/9818852/10117740/9e20ee46-6493-11e5-95b4-f30df5ac22e1.png)
    
    After:
    
![after](https://cloud.githubusercontent.com/assets/9818852/10117737/9e1864c4-6493-11e5-8541-31ff0ead329a.png)
    
![after2](https://cloud.githubusercontent.com/assets/9818852/10117738/9e1c8658-6493-11e5-954a-fb00f36f4d3b.png)
    
    


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

    $ git pull https://github.com/suyanNone/spark duplicate

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

    https://github.com/apache/spark/pull/8923.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 #8923
    
----
commit 315887a5267a385d40a47267dcd25664414f1784
Author: hushan <[email protected]>
Date:   2015-09-26T13:12:39Z

    Duplicate stage

----


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