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acme (189)

acme
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http://www.astray.com/
Leon Brocard (aka acme) is an orange-loving Perl eurohacker with many varied contributions to the Perl community, including the GraphViz module on the CPAN. YAPC::Europe was all his fault. He is still looking for a Perl Monger group he can start which begins with the letter 'D'.

Journal of acme (189)

Thursday February 28, 2008
11:46 AM

Retries in Net::Amazon::S3

[ #35788 ]
One of the slight issues with Amazon's Simple Storage Service is that by design sometimes the service returns a HTTP 500 Internal Server Error response and the client should retry the request. Previously, applications which use my Net::Amazon::S3 module, such as Brackup, had to handle the retries themselves - but no more! With the magic that is LWP::UserAgent::Determined you can now pass a retry option into the version 0.42 of Net::Amazon::S3 and it will handle the retries with exponential backoff for you.

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  • Thanks a lot for this, Leon. I'm so happy I don't have to implement this on my own now.
  • Why Exponential and not Fibonacci? It probably won't matter in real life (since it will only take a single retry), but I think Fibonacci is the generally preferred algorithm. Exponential gets unreasonable after just a few iterations. (16 seconds, then 32 seconds?)

    • Mostly because it's the one Amazon recommend. Many retries aren't often necessary, Amazon S3 for Science Grids: a Viable Solution (PDF) [usf.edu] mentions:

      We have observed an availability rate of 99.03% after the original download attempt, 99.55% after the first retry and a full 100% availability after two retries. Additional retries were never needed during the observed period. These results are convergent with Amazon's stated 99.99% availability target.

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