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You can roll back from the pipeline front end. For example, the Half Pipe The entire stream can be rolled back by clicking "Rollback Stream" at the top, or individual streams in the HalfPipe main stream can be rolled back by selecting the pink boxes under "Stream Processes" and clicking "Rollback Selected".

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Removing "dontCleanUp" is not necessary to process the data. The file just stops temporary files from getting deleted when we're done with them.

Rolling back substreams

From the front end, find the "Substreams" area and click the pink boxes for substreams that you want to roll back. Then click "Rollback Selected SubStreams".

From the front end it's trivial, but from the command line it's a bit more tricky:
/afs/slac.stanford.edu/u/gl/glast/pipeline-II/prod/pipeline \-m PROD rollbackStream \--minimum 'L1Proc\[90117001\]/doRun\[253889937\]'

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