Github user gallenvara commented on the pull request:

    https://github.com/apache/flink/pull/1956#issuecomment-217527593
  
    Hi, @vasia @greghogan ,
    - code modified and support to return both hub and authority score as 
`Tuple2` type now. The implementation will run extra one iteration to normalize 
the hub value in the end. With scatter-gather being implemented, the GSA 
version is easy to write.
    - As for the threshold, the algorithm should check neighboring hub or 
authority iteration whether there are vertex updating. It's a little difficult 
and from my view, the` maxIteration` parameter play a similar role with 
threshold. 
    - I will open another issue for GSA version and relevant tests.


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