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我想检查一个新图(称为A)是否是其他图(称为B)的子图。我写了一个测试的小演示,但失败了!我跑只是火花外壳演示,火花版本1.6.1:如何使用Spark图形函数遮罩?
// Build the GraphB
val usersB = sc.parallelize(Array(
(3L, ("rxin", "student")),
(7L, ("jgonzal","postdoc")),
(5L, ("franklin", "prof")),
(2L, ("istoica", "prof"))
))
val relationshipsB = sc.parallelize(Array(
Edge(3L, 7L, "collab"),
Edge(5L, 3L, "advisor"),
Edge(2L, 5L, "colleague"),
Edge(5L, 7L, "pi")
))
val defaultUser = ("John Doe", "Missing")
val graphB = Graph(usersB, relationshipsB, defaultUser)
// Build the initial Graph A
val usersA = sc.parallelize(Array(
(3L, ("rxin", "student")),
(7L, ("jgonzal", "postdoc")),
(5L, ("franklin", "prof"))
))
val relationshipsA = sc.parallelize(Array(
Edge(3L, 7L, "collab"),
Edge(5L, 3L, "advisor")
))
val testGraphA = Graph(usersA, relationshipsA, defaultUser)
//do the mask
val maskResult = testGraphA.mask(graphB)
maskResult.edges.count
maskResult.vertices.count
在我的理解API on spark website,屏蔽功能可按能得到所有相同的边和顶点。然而,结果是顶点只是正确的(maskResult.vertices.count = 3),边数应该是2但不是(maskResult.edges.count = 0)。
不错的答案。我只想补充一点,他可以选择可以在[这里]找到的预先打包的分区策略之一(http://spark.apache.org/docs/1.5.1/api/scala/index.html#org。 apache.spark.graphx.PartitionStrategy $)。所以,也许他不需要真正创建一个,他可以像'testGraphA.partitionBy(PartitionStrategy.CanonicalRandomVertexCut)' –
好,稍后会添加到我的答案 –