Ben Sidhom commented on BEAM-3587:

I built at head and ran a simple program that reads in a text file and writes 
it out to a different file. It seems to work for me.

> User reports TextIO failure in FlinkRunner on master
> ----------------------------------------------------
>                 Key: BEAM-3587
>                 URL: https://issues.apache.org/jira/browse/BEAM-3587
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Kenneth Knowles
>            Assignee: Ben Sidhom
>            Priority: Blocker
>             Fix For: 2.3.0
> Reported here: 
> [https://lists.apache.org/thread.html/47b16c94032392782505415e010970fd2a9480891c55c2f7b5de92bd@%3Cuser.beam.apache.org%3E]
> "I'm trying to run a pipeline containing just a TextIO.read() step on a Flink 
> cluster, using the latest Beam git revision (ff37337). The job fails to start 
> with the Exception:
>   {{java.lang.UnsupportedOperationException: The transform  is currently not 
> supported.}}
> It does work with Beam 2.2.0 though. All code, logs, and reproduction steps  
> [https://github.com/pelletier/beam-flink-example]";
> My initial thoughts: I have a guess that this has to do with switching to 
> running from a portable pipeline representation, and it looks like there's a 
> non-composite transform with an empty URN and it threw a bad error message. 
> We can try to root cause but may also mitigate short-term by removing the 
> round-trip through pipeline proto for now.
> What is curious is that the ValidatesRunner and WordCountIT are working - 
> they only run on a local Flink, yet this seems to be a translation issue that 
> would occur for local or distributed runs.
> We need to certainly run this repro on the RC if we don't totally get to the 
> bottom of it quickly.

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