ruby - If thin timeouts, the instance won't reply anymore -


i have setup:

  • ruby 1.8.7
  • rails 2.3.18
  • three instances of thin
  • nginx proxy

it's high concurrency website. time time, there request raises timeout in 1 of thin instances (due heavy operations). when happens, instance cpu goes 100%, , stops replying new request.

nginx default has option forward request next upstream, , request ends in timeout, ends 3 instances using 100% cpu, , not replying request.

we have modified nginx option to:

proxy_next_upstream off;

but still have issue. if user refreshes page, end breaking our thin instances.

  • why thin keep running @ 100% cpu if request ends in timeout?
  • is there way make thin continue running fine if 1 of requests ends in timeout?
  • what best way automatically restart instances if blocked nginx hook calls command if receiving timeouts?

i know need upgrade ruby , rails versions, , know heavy operations should done in background, please don't make comments that, , stick questions.


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