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https://issues.apache.org/jira/browse/BEAM-10670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343110#comment-17343110
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Wilson Lauw commented on BEAM-10670:
------------------------------------

I have issues with PubsubIO + Direct Runner too, the messages are consumed from 
pubsub side, but nothing is happening in the Beam side (stuck or something). 

Additionally, when I upgraded from beam 2.24.0 -> 2.25.0, I can workaround this 
by using `–experiments=use_deprecated_read`, but seems like starting from 
version 2.26.0, this option no longer works.

This is a blocker for me to upgrade beam version since there is no way to 
revert back to old implementation.

> Make non-portable Splittable DoFn the only option when executing Java "Read" 
> transforms
> ---------------------------------------------------------------------------------------
>
>                 Key: BEAM-10670
>                 URL: https://issues.apache.org/jira/browse/BEAM-10670
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Luke Cwik
>            Assignee: Ismaël Mejía
>            Priority: P1
>              Labels: Clarified
>             Fix For: 2.30.0
>
>          Time Spent: 39h 50m
>  Remaining Estimate: 0h
>
> All runners seem to be capable of migrating to splittable DoFn for 
> non-portable execution except for Dataflow runner v1 which will internalize 
> the current primitive read implementation that is shared across runner 
> implementations.



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