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https://issues.apache.org/jira/browse/FLINK-13996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17274473#comment-17274473
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Robert Metzger commented on FLINK-13996:
----------------------------------------

Improved in 
https://github.com/apache/flink/commit/0daa8de738aec00f30cdcb8079a901fd555af293.

> Maven instructions for 3.3+ do not cover all shading special cases
> ------------------------------------------------------------------
>
>                 Key: FLINK-13996
>                 URL: https://issues.apache.org/jira/browse/FLINK-13996
>             Project: Flink
>          Issue Type: Improvement
>          Components: Build System, Documentation
>    Affects Versions: 1.8.0
>            Reporter: Chesnay Schepler
>            Assignee: Robert Metzger
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.13.0
>
>
> When building Flink on Maven 3.3+ extra care must be taken to ensure that the 
> shading works as expected. Since 3.3 the dependency graph is immutable, as a 
> result of which downstream modules (like flink-dist) see the unaltered set of 
> dependencies of bundled modules; regardless of these were bundled or not. As 
> a result dependencies may be bundled multiple times (original and relocated 
> versions).
> The [instructions for building Flink with Maven 
> 3.3+|https://ci.apache.org/projects/flink/flink-docs-master/flinkDev/building.html#dependency-shading]
>  correctly point out that flink-dist must be built separately, however (at 
> the very least) all filesystems relying on {{flink-fs-hadoop-shaded}} are 
> also affected.



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