[akka-user][deprecated] Akka backoff supervision for HTTP retries

Discussion:

mandeep gandhi

2018-11-05 09:40:20 UTC

Hi all,

My use case is that I want to make external calls from an actor( on
receiving a type of message). If the HTTP call fails, I want to retry
exponentially. My current code uses scalaj.http to HTTP calls.

How to achieve it?

Can Akka's Backoff supervisor strategy be used for the same (or is it an
anti-pattern)?

Thanks,
Mandeep Gandhi
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Brian Maso

2018-11-05 15:58:53 UTC

Permalink

I'm sure there are a tons of ways of doing exponential back-off. If your
current implementation is Future-based, then this sounds like a job for
Future.recoverWith: try defining a Future-returning function that
recursively calls itself in Future.recoverWith.

And if you are using Akka Streams for streaming data from multiple HTTPs
calls as a Source, then I would recommend a slurry of Source.unfoldAsync
and Source.recoverWithRetries (or equivalent/related Akka Streams
functionality).

I imagine using Akka's supervisor strategy might work as well, but it feels
not very functional to me... Sounds like trying to employ side-effects
where good old functional composition describes the solution much better.

Brian Maso

Post by mandeep gandhi
Hi all,
My use case is that I want to make external calls from an actor( on
receiving a type of message). If the HTTP call fails, I want to retry
exponentially. My current code uses scalaj.http to HTTP calls.
How to achieve it?
Can Akka's Backoff supervisor strategy be used for the same (or is it an
anti-pattern)?
Thanks,
Mandeep Gandhi
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** New discussion forum: https://discuss.akka.io/ replacing akka-user google-group soon.
** This group will soon be put into read-only mode, and replaced by discuss.akka.io
https://akka.io/blog/news/2018/03/13/discuss.akka.io-announced
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Read the docs: http://akka.io/docs/

http://doc.akka.io/docs/akka/current/additional/faq.html

Search the archives: https://groups.google.com/group/akka-user

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