[jira] [Updated] (SPARK-21478) Unpersist a DF also unpersists related DFs

["Roberto Mirizzi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roberto Mirizzi updated SPARK-21478:
------------------------------------
    Summary: Unpersist a DF also unpersists related DFs  (was: Unpersist a DF also unpersist related DFs)

> Unpersist a DF also unpersists related DFs
> ------------------------------------------
>
>                 Key: SPARK-21478
>                 URL: https://issues.apache.org/jira/browse/SPARK-21478
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Roberto Mirizzi
>            Priority: Blocker
>
> Starting with Spark 2.1.1 I observed this bug. Here's are the steps to reproduce it:
> # create a DF
> # persist it
> # count the items in it
> # create a new DF as a transformation of the previous one
> # persist it
> # count the items in it
> # unpersist the first DF
> Once you do that you will see that also the 2nd DF is gone.
> The code to reproduce it is:
> {code:java}
> val x1 = Seq(1).toDF()
> x1.persist()
> x1.count()
> assert(x1.storageLevel.useMemory)
> val x11 = x1.select($"value" * 2)
> x11.persist()
> x11.count()
> assert(x11.storageLevel.useMemory)
> x1.unpersist()
> assert(!x1.storageLevel.useMemory)
> //the following assertion FAILS
> assert(x11.storageLevel.useMemory)
> {code}



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