Q:

Perform action after Dataflow pipeline has processed all data

Is it possible to perform an action once a batch Dataflow job has finished processing all data? Specifically, I'd like to move the text file that the pipeline just processed to a different GCS bucket. I'm not sure where to place that in my pipeline to ensure it executes once after the data processing has completed.

A:

I don't see why you need to do this post pipeline execution. You could use side outputs to write the file to multiple buckets, and save yourself the copy after the pipeline finishes.
If that's not going to work for you (for whatever reason), then you can simply run your pipeline in blocking execution mode i.e. use pipeline.run().waitUntilFinish(), and then just write the rest of your code (which does the copy) after that.
[..]
// do some stuff before the pipeline runs
Pipeline pipeline = ...
pipeline.run().waitUntilFinish();
// do something after the pipeline finishes here
[..]

