Comments (7)
I really don't know, but there are practices:
- http://streamparse.readthedocs.io/en/stable/topologies.html#dealing-with-errors
- http://python-rq.org/docs/exceptions/
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from streamz.
Currently nothing :) I wait for your advise.
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Have a client on the same machine as the scheduler? Have the client process read from the redis queue and take whatever action you deem appropriate?
Honestly I'm not sure how much help I can be here without diving into your particular problem more deeply (which is probably not likely to occur).
If you have more particular questions about how things work or thoughts on what features you would need then please let me know .
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The part I'm least aware of is the progress monitoring:
- How can I subscribe to futures prefixed by a key?
- Should I instantiate a scheduler plugin (like progressbar) per task submission, or per client?
- Should I prefer long living Clients?
- How can I nicely handle (non-critical) task failures? (the frameworks mentioned above put the failed tasks to a separate queue) - a minimal error handling would be nice in
streams
.
Actually I would like to use redis as a resilient/persistent layer just before distributed
if the scheduler dies, network error etc.
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- If you're looking for a cross-client subscription mechanism then maybe use channels? There are more opportunities for cross-client communication; channels aren't perfect but they can often get the job done. Of course if you can solve your problem without multiple clients then this is probably better.
- I tend to create a single scheduler plugin. I haven't yet found an application where I needed to create one per client. You may have something else in mind though.
- Starting a client does take some milliseconds. I guess that this would depend on your performance needs.
- Yeah, I agree that streams should handle error handling and possibly stop signals. This is on a TODO list somewhere :)
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How do you think streams
should handle exceptions?
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