1
在spark-shell
,一些计算后,我买了HashMap
类型的值,但我不能列出所有(key, value)
:为什么我得到一个“构造函数不能实例化到预期类型”的错误?
scala> provinces_cookies
res44: org.apache.spark.rdd.RDD[scala.collection.mutable.HashMap[Int,Int]] = MapPartitionsRDD[20] at map at <console>:44
scala> for((k, v) <- provinces_cookies) println (k + "-->" + v)
<console>:47: error: constructor cannot be instantiated to expected type;
found : (T1, T2)
required: scala.collection.mutable.HashMap[Int,Int]
for((k, v) <- provinces_cookies) println (k + "-->" + v)
上市的所有key --> value
,我该怎么办?谢谢!