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https://issues.apache.org/jira/browse/SPARK-26771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-26771.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0

Issue resolved by pull request 23685
[https://github.com/apache/spark/pull/23685]

> Make .unpersist(), .destroy() consistently non-blocking by default
> ------------------------------------------------------------------
>
>                 Key: SPARK-26771
>                 URL: https://issues.apache.org/jira/browse/SPARK-26771
>             Project: Spark
>          Issue Type: Improvement
>          Components: GraphX, Spark Core
>    Affects Versions: 2.4.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Major
>              Labels: release-notes
>             Fix For: 3.0.0
>
>
> See https://issues.apache.org/jira/browse/SPARK-26728 and 
> https://github.com/apache/spark/pull/23650 . 
> RDD and DataFrame expose an .unpersist() method with optional "blocking" 
> argument. So does Broadcast.destroy(). This argument is false by default 
> except for the Scala RDD (not Pyspark) implementation and its GraphX 
> subclasses. Most usages of these methods request non-blocking behavior 
> already, and indeed, it's not typical to want to wait for the resources to be 
> freed, except in tests asserting behavior about these methods (where blocking 
> is typically requested).
> This proposes to make the default false across these methods, and adjust 
> callers to only request non-default blocking behavior where important, such 
> as in a few key tests. 



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