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https://issues.apache.org/jira/browse/BEAM-3519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358132#comment-16358132
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Ismaël Mejía commented on BEAM-3519:
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The explicit issue probably existed before (GCPIO leaking netty), but it was
not detected because the previous version of the Spark runner (based on Spark
1.x) used a version of netty that didn't complain.
In any case shading correctly GCPIO would be great to avoid this issue in the
future in other runners too.
> GCP IO exposes netty on its API surface, causing conflicts with runners
> -----------------------------------------------------------------------
>
> Key: BEAM-3519
> URL: https://issues.apache.org/jira/browse/BEAM-3519
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-gcp
> Reporter: Ismaël Mejía
> Assignee: Chamikara Jayalath
> Priority: Blocker
> Fix For: 2.3.0
>
>
> Google Cloud Platform IOs module leaks netty this causes conflicts in
> particular with execution systems that use conflicting versions of such
> modules.
> For the case there is a dependency conflict with the Spark Runner version of
> netty, see: BEAM-3492
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