jaehwan0214 opened a new pull request #299:
URL: https://github.com/apache/incubator-nemo/pull/299


   JIRA: [NEMO-392: Support combine in streaming] 
(https://issues.apache.org/jira/projects/NEMO/issues/NEMO-392)
   
   **Major changes:**
   - Added GBKStreamingTransform to support streaming processing for GroupByKey 
and Combine operation.
        - Each time an element arrives, GBKStreamingTransform invokes runner to 
process a single element and stores its state,
           instead of waiting to process it until the time to emit it to 
downstream.
   - Removed GroupByKeyAndWindowDoFnTransform since GBKStreamingTransform can 
perform both Combine.Perkey 
      and GroupByKeyAndWindow operation.
   
   **Minor changes to note:**
   - N/A
   
   **Tests for the changes:**
   - Added GBKStreamingTransformTest to test the correctness of 
GBKStreamingTransform.
   - Modified GroupByKeyAndWindowDoFnTransformTest to test 
GBKStreamingTransform.
   
   **Other comments:**
   - Mostt of the work is done by TaeGun Um
   
   Closes #GITHUB_PR_NUMBER
   


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