Hi everyone!
I've recently deployed Varnish 2.1.3 on a 64-bit CentOS 5.5, but it
seems to fail on certain requests under stress. It's a POST request
that's PASSed through to the backend. The backend is rather bulky
Windows CMS, but it usually answers these requests quite fast.
According to the logs, it fails while talking to the backend and returns
a 503 error to the client after hanging for approximately 5000ms. The
Windows backend has a connection timeout of 120s, and Varnish is
configured with a timeout of 60s (connect_timeout, first_byte_timeout
and between_bytes_timeout) so that's a bit weird.
This happens in approximately 5-10% of these requests, which doesn't
point to bad mojo in my VCL files - but I could be wrong. Let me know if
these would be helpful.
Here's a typical failed request:
46 Debug c "herding"
46 SessionClose c timeout
46 StatSess c x.x.x.x 16838 7 1 3 0 2 2 833 52886
46 SessionOpen c x.x.x.x 20290 :80
46 Debug c "herding"
46 ReqStart c x.x.x.x 20290 2127593665
46 RxRequest c POST
46 RxURL c /webservices/RelatedProducts.asmx/GetRelatedProducts
46 RxProtocol c HTTP/1.1
46 RxHeader c Accept: */*
46 RxHeader c Accept-Language: da
46 RxHeader c Referer: http://xxx
46 RxHeader c Content-Type: application/json; charset=utf-8
46 RxHeader c UA-CPU: x86
46 RxHeader c Accept-Encoding: gzip, deflate
46 RxHeader c User-Agent: Mozilla/4.0 (compatible; MSIE 7.0;
Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR
3.5.30729; .NET CLR 3.0.30618)
46 RxHeader c Host: xxx
46 RxHeader c Content-Length: 106
46 RxHeader c Connection: Keep-Alive
46 RxHeader c Cache-Control: no-cache
46 RxHeader c Cookie: xxx
46 VCL_call c recv
46 VCL_acl c MATCH allowedClients 0.0.0.0/0
46 VCL_return c pass
46 VCL_call c hash
46 VCL_return c hash
46 VCL_call c pass
46 VCL_return c pass
46 Backend c 114 default default
46 FetchError c backend write error: 11 <-- oops!
46 VCL_call c error
46 VCL_return c deliver
46 VCL_call c deliver
46 VCL_return c deliver
46 TxProtocol c HTTP/1.1
46 TxStatus c 503
46 TxResponse c Service Unavailable
46 TxHeader c Server: Varnish
46 TxHeader c Retry-After: 0
46 TxHeader c Content-Type: text/html; charset=utf-8
46 TxHeader c Content-Length: 1012
46 TxHeader c Date: Fri, 30 Jul 2010 16:22:01 GMT
46 TxHeader c Age: 5
46 TxHeader c Connection: close
46 TxHeader c X-Cache: MISS
46 Length c 1012
46 ReqEnd c 2127593665 1280506916.547359943
1280506921.548347950 0.000546932 5.000926018 0.000061989
Let me know if there's anything I can do to help resolve this.
Cheers,
HC
--
Hans Christian Saustrup
Partner, CodeCompany.dk, Skolebakken 7, 8000 Århus C
Mobil +45-30261024
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