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GraphX is the Apache Spark library for handling graph data. I was able to find a list of 'graph-parallel' algorithms on these slides (see slide 23). However, I am curious what characteristics of these algorithms make them parallelizable.

sheldonkreger
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Two words: associative and commutative

In other words, the operations that the algorithm does need to be independent of how you order or group your data...this minimizes the need for cross-talk in the algorithm and leads to more efficiency.