[jira] [Commented] (SPARK-4031) Read broadcast variables on use

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177983#comment-14177983 ] 

Apache Spark commented on SPARK-4031:
-------------------------------------

User 'shivaram' has created a pull request for this issue:
https://github.com/apache/spark/pull/2871

> Read broadcast variables on use
> -------------------------------
>
>                 Key: SPARK-4031
>                 URL: https://issues.apache.org/jira/browse/SPARK-4031
>             Project: Spark
>          Issue Type: Bug
>          Components: Block Manager, Spark Core
>            Reporter: Shivaram Venkataraman
>            Assignee: Shivaram Venkataraman
>
> This is a proposal to change the broadcast variable implementations in Spark to only read values when they are used rather than on deserializing.
> This change will be very helpful (and in our use cases required) for complex applications which have a large number of broadcast variables. For example if broadcast variables are class members, they are captured in closures even when they are not used.
> We could also consider cleaning closures more aggressively, but that might be a more complex change.



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