September 2015
Intermediate to advanced
148 pages
3h 20m
English
Content preview from Apache Spark Graph ProcessingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Performance optimization
In addition to the sendMsg and mergeMsg methods, aggregateMessages can also take an optional argument TripletFields, which indicates what data is accessed in EdgeContext. The main reason for explicitly specifying such information is to help optimize the performance of the aggregateMessages operation.
In fact, TripletFields represents a subset of the fields of _EdgeTriplet_ and it enables GraphX to populate only those fields that are necessary.
The default value is TripletFields.All, which means that the sendMsg function may access any of the fields in the EdgeContext class. Otherwise, the TripletFields argument is used to tell GraphX that only part of EdgeContext will be required so that an efficient join strategy can be ...
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