Sebastian Schelter updated GIRAPH-105:

    Attachment: GIRAPH-105-2.patch

updated patch to reflect aching's suggestions, ran local and pseudo distributed 
> BspServiceMaster.checkWorkers() should return empty lists instead of null
> -------------------------------------------------------------------------
>                 Key: GIRAPH-105
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-105
>             Project: Giraph
>          Issue Type: Bug
>    Affects Versions: 0.70.0
>            Reporter: Sebastian Schelter
>            Priority: Minor
>         Attachments: GIRAPH-105-2.patch, GIRAPH-105.patch
> BspServiceMaster.checkWorkers() is invoked in 
> BspServiceMaster.coordinateSuperstep() and in 
> BspServiceMaster.createInputSplits(). Both check for an empty list to fail 
> the job in case something has gone wrong. However, checkWorkers() returns 
> null in case of problems, causing an NPE in the calling code.

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