GitHub user zuyu opened a pull request:

    https://github.com/apache/incubator-quickstep/pull/279

    Applied WorkOrderSelectionPolicy.

    This PR introduced `WorkOrderSelectionPolicy` to choose the next 
`WorkOrder` for the execution, and uses the following policy: first `FIFO` for 
`RebuildWorkOrder`s, and then `LIFO` for normal `WorkOrder`s.
    
    This policy favors any `RebuildWorkOrder` to reduce the total operator 
completion time, and normal `WorkOrder`s generated from data pipeline messages. 
Finally, a normal `WorkOrder` from a larger `OperatorIndex` is preferred.
    
    Assigned to @jianqiao.

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

    $ git pull https://github.com/zuyu/incubator-quickstep 
refactor-getNextWorkerMessage

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

    https://github.com/apache/incubator-quickstep/pull/279.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 #279
    
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commit e95fee93ca1854da589687976c900239e0f2cf2d
Author: Zuyu Zhang <z...@cs.wisc.edu>
Date:   2017-08-10T02:13:29Z

    Applied WorkOrderSelectionPolicy.

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