[SPARK-14390][GraphX] Make initialization step in Pregel optional. #12302
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adeandrade
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Can one of the admins verify this patch? |
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I'll close this cuz the corresponding jira has been already closed. |
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What changes were proposed in this pull request?
Suppose a sendMsg function depends on the state of a edge's vertices to send messages, and those Pregel messages update such state. In this scenario, initialMsg will initially enforce the same message on all vertices, effectively removing a custom initialization one may have per vertex.
To deal with this situation, we must define a dummy initMsg (i.e. None), and all Pregel functions must be modified to handle this type of message. A simpler and less cumbersome solution is to make initMsg and the initialization step in Pregel optional.
How was this patch tested?
No new tests were added. Some tests were updated. Previous functionality was kept.