-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 1/14/16 6:29 AM, Jayanth Kalyanasundaram wrote: > > Hey, like you said the issue only happens sometimes. But the > first_byte_timeout for all the backends is set to 300 seconds. > > [root@varnish ~]# sudo varnishadm "param.show first_byte_timeout" > first_byte_timeout Value is: 300.000 [seconds] Default is: 60.000 > Minimum is: 0.000 > > Also the time difference between the backend request and backend > response seems to be different each time this issue occurs. For > instance, in this case http://pastebin.com/eS2Ldnbv the difference > is just 0.6 seconds. So I don't think it can be an issue with > timeouts. > > Would this also happen if the backend server gives an empty > response to the request ?
Yes, that would also happen, or if the connection is prematurely closed. Since your backend apparently responds with times ranging from 0.6s to 27s to 54s, and sometimes either drops the connection or sends an empty response, it looks like your problem is the backend and not Varnish. If I may add, "set the Varnish timeout really high" (as in 5 minutes) is a common reaction from backend developers, but is usually not the way to solve a such a problem. With that timeout, your worker threads could be idle for up to five minutes, and you could rapidly exhaust your thread pool. There's no way around it -- the backend needs to be fixed. Best, Geoff - -- UPLEX Systemoptimierung Scheffelstraße 32 22301 Hamburg http://uplex.de/ Mob: +49-176-63690917 -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) iQIcBAEBCAAGBQJWl0XVAAoJEOUwvh9pJNURH5gP/AuFxAcddrCoSLjbsGF/7D8C zmuyaL3fY89LFwSavTKq1IVU8vPedKE2P+MAO6wlfOPIOV9EAFOOJ04kXVd4RvhQ +RCO4xCIX8wKrpla+mF2fD9f0zW5S8AaYm1B935XfLyibsjNtDT3aAY7KE0mqTSO MH6/HaEH7WiFOe2Ahp9YPQeqmrixj8Cf0w99sort9ZxTb6Seh8rZxcg0nwFJnFFB mKWa1f6pC6mlocc4NkykQGm6sn5ywWff+NyVCj+tqKRJj+SEtVDemcgd6VPItmRa BB9ixLBjIvCM2881surpLo4GPqTqGZqS8FYlWKj7jfBmrJaQjYuUGOeTB0Z8l+Dr 7HLBWn9OYx2dgQ2IIl4kinKjfSQBqCPW+kGOyfHpNrzdUJuNHUAmOmB1tdtl3heM H3H4ysDfHnXNsPNYLNIsIclQOFdqG11yt4YrGR36y+3+oywOqAFvs89YLv8ohiPJ cl6r/PzqocdliDbWAF/hsSSwd8KFGORQmIESH/qbAHMjlFdwfdt3zQBjS1hdnQrj n9lY0t+pwbnnxgVwot6EMNOQUAP3gkKVUF8e02lqdlG4sm73IuTG8ooxe6+vonEX Eyd2HzBASdOtDQ2abj1I6scHrzP1jdg+1SmlsiAkx+DJfpNftUVp5RI/jK67q9Ln MrdlQWfYryv1yOcvICF0 =LALc -----END PGP SIGNATURE----- _______________________________________________ varnish-misc mailing list varnish-misc@varnish-cache.org https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc