Ismaël Mejía commented on BEAM-3519:

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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