Status: In Progress
Affects Version/s: 3.1.0
Fix Version/s: None
So the computation happens every time in the do-while loop, the first time the outer while loop executes. although just once per do-while loop after, it seems, but It does reduce a lot of recomputation；because every time it jump out of the do-while loop，there are no vertices have only out-degree or in-degree，so it's no need to recompute degree to tag the vertices true.
I have done a small code proposal, because there is a problem when the pregel executions have done, the degree no need to be recomputed.
for example，the Email-EuAll data set：http://snap.stanford.edu/data/email-EuAll.html
do-while loop execute 10 times，and the reduce logic happend 2 times；so it would be helpful when computing StronglyConnectedComponents to reduce degree computation.
I hope you can consider this small code proposal.
Thank you very much,