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https://issues.apache.org/jira/browse/SPARK-2071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14026195#comment-14026195
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Patrick Wendell edited comment on SPARK-2071 at 6/10/14 7:16 AM:
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I just meant that we could introduce a new project in the build that only 
existed for the purpose of donwloading the older artifacts. So the script could 
do `sbt/sbt oldDeps/compile`. You could build the dependencies of the project 
by adding the previousArtifact's from each of the other projects.


was (Author: pwendell):
I just meant that we could introduce a new project in the build that only 
existed for the purpose of donwloading the older artifacts. So the script could 
do `sbt/sbt oldDeps/retrieveManaged`.

> Package private classes that are deleted from an older version of Spark 
> trigger errors
> --------------------------------------------------------------------------------------
>
>                 Key: SPARK-2071
>                 URL: https://issues.apache.org/jira/browse/SPARK-2071
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Build
>            Reporter: Patrick Wendell
>            Assignee: Prashant Sharma
>             Fix For: 1.1.0
>
>
> We should figure out how to fix this. One idea is to run the MIMA exclude 
> generator with sbt itself (rather than ./spark-class) so it can run against 
> the older versions of Spark and make sure to exclude classes that are marked 
> as package private in that version as well.



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