[jira] [Created] (SPARK-22988) Why does dataset's unpersist clear all the caches have the same logical plan?

["Wang Cheng (JIRA)" <ji...@apache.org>]

Wang Cheng created SPARK-22988:
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             Summary: Why does dataset's unpersist clear all the caches have the same logical plan?
                 Key: SPARK-22988
                 URL: https://issues.apache.org/jira/browse/SPARK-22988
             Project: Spark
          Issue Type: Question
          Components: Spark Core
    Affects Versions: 2.1.1
            Reporter: Wang Cheng
            Priority: Minor


When I do followings:
dataset A = some dataset
A.persist

dataset B = A.doSomthing
dataset C = A.doSomthing

C.persist
A.unpersist

I found C's cache is removed too, since following code:
def uncacheQuery(spark: SparkSession, plan: LogicalPlan, blocking: Boolean): Unit = writeLock {
    val it = cachedData.iterator()
    while (it.hasNext) {
      val cd = it.next()
      if (cd.plan.find(_.sameResult(plan)).isDefined) {
        cd.cachedRepresentation.cachedColumnBuffers.unpersist(blocking)
        it.remove()
      }
    }
  }

It removes the data caches contains the some logical plan, should it only remove the cache whose dataset calls unpersist method? 



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