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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-21478) Unpersist a DF also unpersists related DFs
Date Thu, 20 Jul 2017 19:07:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-21478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095208#comment-16095208
] 

Sean Owen commented on SPARK-21478:
-----------------------------------

I said I can reproduce it, I agree with you.

> 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: SQL
>    Affects Versions: 2.1.1, 2.2.0
>            Reporter: Roberto Mirizzi
>
> 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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