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Spark - GraphX: mapReduceTriplets vs aggregateMessages


Spark - GraphX: mapReduceTriplets vs aggregateMessages

By : user2952240
Date : November 19 2020, 12:41 AM
With these it helps I am running by a tutorial http://ampcamp.berkeley.edu/big-data-mini-course/graph-analytics-with-graphx.html , Probably you need something like this:
code :
val oldestFollower: VertexRDD[(String, Int)] = userGraph.aggregateMessages[(String, Int)]
(
    // For each edge send a message to the destination vertex with the attribute of the source vertex
    sendMsg = { triplet => triplet.sendToDst(triplet.srcAttr.name, triplet.srcAttr.age) },
   // To combine messages take the message for the older follower
    mergeMsg = {(a, b) => if (a._2 > b._2) a else b}
)


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applying a function to graph data using mapReduceTriplets in spark and graphx

applying a function to graph data using mapReduceTriplets in spark and graphx


By : Doubi
Date : March 29 2020, 07:55 AM
I wish this help you I think you want to use GraphOps.collectNeighbors instead of either mapReduceTriplets or aggregateMessages.
collectNeighbors will give you an RDD with, for every VertexId in your graph, the connected nodes as an array. Just reduce the Array based on your needs. Something like:
code :
val countsRdd = graph.collectNeighbors(EdgeDirection.Either)
  .join(graph.vertices)
  .map{ case (vid,t) => {
    val neighbors = t._1
    val nodeAttr = t._2
    neighbors.map(_._2).filter( <add logic here> ).size
  }
how to add spark core and mllib and graphx dependency at the same time to spark project in scala IDE

how to add spark core and mllib and graphx dependency at the same time to spark project in scala IDE


By : Mohsen It
Date : March 29 2020, 07:55 AM
will help you My Internet connection was slow and Scala IDE couldn't access to dependencies. I have added all dependencies under 1.6.1 version. these are running well now.
Spark GraphX spark-shell vs spark-submit performance differences

Spark GraphX spark-shell vs spark-submit performance differences


By : Chien Nguyen
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I figured this out a while back and just bumped into my question again. So thought would update with how I fixed it. The issue was not a difference between spark-submit and spark-shell but difference in the code structure we were executing.
In the Shell i was unbundling the code and executing it line by line, this resulted in the code generated by Spark being fast and efficient.
spark sbt with graphx

spark sbt with graphx


By : Keith
Date : March 29 2020, 07:55 AM
With these it helps I am new to scala and sbt thing, so I am not sure why I am getting the error. , This is version mismatch. You use:
Spark 2.2 GraphX 1.2.
how to get two-hop neighbors in spark-graphx?

how to get two-hop neighbors in spark-graphx?


By : LizB
Date : March 29 2020, 07:55 AM
wish helps you You can succinctly express this using GraphFrames library. First you have to include required package. For with Spark 2.0 and Scala 2.11 you can add
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