Github user larryxiao commented on the pull request:
https://github.com/apache/spark/pull/1903#issuecomment-55714900
As described in commit message:
a copy of vertices with defaultVal is created before, and it's b in
(a, b) => b
see in VertexPartition.scala
val fullIter = iter ++ routingTable.iterator.map(vid => (vid,
defaultVal))
So there's hidden rule that default mergeFunc should be (a, b) => a.
Should I write a comment to let user know about this?
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