Github user shijinkui commented on the pull request:
https://github.com/apache/spark/pull/3866#issuecomment-68974660
@ankurdave
Solution 1 is better. It have to add `joinVertices ` for reset
`isAttrChanged` to default value.
It have two problem having no idea for solving:
1. Progressive increase one second every iteration.
We can't accept one second progressive increased, because after 600th
iteration, the extra cost will become 600s. It like this:
iteration | increace | cost
------------ | ------------- | ------------
100 | 1 | 150
101 | 1 | 151
102 | 1 | 152
103 | 1 | 153
104 | 1 | 154
.. | 1 | ..
700 | 1 | 850
701 | 1 | 851
703 | 1 | 852
704 | 1 | 853
2 `joinVertices`
`joinVertices` will own half cost of the whole `Pregel-liked` cost.
The more iteration the bigger of `joinVertices`. It's a linear increase.
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