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From "Josh Wills (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-279) Allow DoFn.process to throw exceptions
Date Thu, 10 Oct 2013 16:55:45 GMT


Josh Wills commented on CRUNCH-279:

My experience was that I usually wanted to increment a counter in response to a checked exception
and then continue on my merry way. What are the pros/cons of throwable exceptions vs. being
able to call a fail() method or some other mechanism for killing a running job?

> Allow DoFn.process to throw exceptions
> --------------------------------------
>                 Key: CRUNCH-279
>                 URL:
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Joseph Adler
>            Assignee: Josh Wills
> Currently, the DoFn process method doesn't throw any exceptions. This forces me to (a)
catch all exceptions internally (which is good), but then (b) do something unnatural (like
a deliberate null pointer exception) to stop processing and cause the job to fail.
> If only we could just throw an exception from DoFn (like, say, an IOException, which
both and Reducer.reduce can throw), we could have a better way to cause a task
to fail on error.
> If other people think this is useful, I'll submit a patch.

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