Github user gallenvara commented on the pull request: https://github.com/apache/flink/pull/1956#issuecomment-220292049 Hi, @vasia @greghogan . Thanks a lot with your advice! I have modify the codes to support the iteration with `EdgeDirection.OUT` instead of `EdgeDirection.ALL` with edge label. And i write a test with big graph to compare the two implementations, the result is: ![hits_compare](https://cloud.githubusercontent.com/assets/12931563/15391189/627af152-1df2-11e6-9e43-33706bd00cdf.PNG) The number of edge is same and the relation between every two nodes is randomly added.
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