问题描述
当我试图在 GraphX 中运行 LP 算法时,我遇到了一个问题,我想知道这个 collection.breakOut 在这里做什么,有人可以帮我吗?
def mergeMessage(count1: Map[VertexId,Long],count2: Map[VertexId,Long])
: Map[VertexId,Long] = {
val temp_d1 = count1.keySet++count2.keySet
val temp_d2 = temp_d1.map(i=>{
val count1Val = count1.getorElse(i,0L)
val count2Val = count2.getorElse(i,0L)
i -> (count1Val+count2Val)
})
//val temp_d3 = temp_d2(collection.breakOut) //this can raise a error
(count1.keySet ++ count2.keySet).map { i =>
val count1Val = count1.getorElse(i,0L)
i -> (count1Val + count2Val)
}(collection.breakOut)}
collection.breakOut 代码是这样的:
package object collection extends scala.AnyRef {
def breakOut[From,T,To](implicit b : scala.collection.generic.CanBuildFrom[scala.nothing,To]) : scala.collection.generic.CanBuildFrom[From,To] = { /* compiled code */ }
}
解决方法
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