构造函数不能实例化为预期类型;发现：（T1，T2，T3，T4，T5）

Question

我是spark-graphx和scala中的新成员。 我写这个方法来验证目标顶点的分数是否已经改变。

def IsGoalVertexFound(graph: Graph[(VertexId,(Int,Float,Float,Float,String)),Float],goalVertex:(VertexId,(Int,Float,Float,Float))): Boolean ={ 
     var IsgoalFound:Boolean=false 
     var targetVertex=graph.vertices.filter{ case (id,(_,gScore,_,_,_)) => id == goalVertex._1 && gScore!=Float.PositiveInfinity} 
      if(targetVertex.isEmpty()) 
      IsgoalFound=true 
     return IsgoalFound 
     } 

我得到这个错误：

Error:(41, 54) constructor cannot be instantiated to expected type; 
found : (T1, T2, T3, T4, T5) 
required: (org.apache.spark.graphx.VertexId, (Int, Float, Float, Float, String)) 
    (which expands to) (Long, (Int, Float, Float, Float, String)) 
    var targetVertex=graph.vertices.filter{ case (id,(_,gScore,_,_,_)) => id == goalVertex._1 && gScore!=Float.PositiveInfinity} 

任何想法？ 很多谢谢

Answer 1

这看起来像是一个序列化错误。尝试goalVertex._1参数拉出到一个局部变量，从而使VertexId不是序列：

def IsGoalVertexFound(graph: Graph[(VertexId,(Int,Float,Float,Float,String)),Float],goalVertex:(VertexId,(Int,Float,Float,Float))): Boolean ={ 
    var IsgoalFound:Boolean=false 
    val localGoal = goalVertex._1 
    var targetVertex=graph.vertices.filter{ case (id,(_,gScore,_,_,_)) => id == localGoal && gScore!=Float.PositiveInfinity} 
     if(targetVertex.isEmpty()) 
     IsgoalFound=true 
    return IsgoalFound 
} 

Answer 2

我尝试了以下解决方案，它能够正常工作：

def IsGoalVertexFound(graph: Graph[(VertexId,(Int,Float,Float,Float,String)),Float],goalVertex:(VertexId,(Int,Float,Float,Float))): Boolean ={ 
    var IsgoalFound:Boolean=false 
    var targetVertex=graph.vertices.filter{ case (id,attr) => id == goalVertex._1 && attr._2._2!=Float.PositiveInfinity}.first() 
    // if(targetVertex.isEmpty()) 
     // IsgoalFound=true 
    return IsgoalFound 
    }