apache-spark - 为什么当其中一个数据帧在scala spark中为unpersist（）时，会从存储中删除多个数据帧(why multiple dataframes are removed from storage when one of them are unpersist() in scala spark)

Question

For the following scala-spark code, x and y are persisted.

(对于以下scala-spark代码，x和y被保留。)

Why was y removed from storage when x is not persisted?

(为什么在x不持久的情况下将y从存储中删除？)

  val x = Seq("1").toDF("x")
  x.persist()
  x.show()

  val y = x.withColumn("y", lit(1))
  y.persist()
  y.show()
  x.unpersist()

  ask by wainhuang translate from so

Answer 1

等待大神答复