Github user markus-h commented on the pull request:
https://github.com/apache/flink/pull/598#issuecomment-93987347
There is no specific usecase, but when you try to process big graphs
locally you often run out of memory with delta iterations.
But the reason I needed this change is a different one. I am doing research
on failure recovery methods in graph analysis. Most Pregel like systems just do
a full checkpointing of all vertices. This was way easier to implement with a
bulk iteration than with delta iterations in Flink so I decided to just provide
gelly with this mode.
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