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Hello,
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<div>This is only to add we've been experiencing exactly the same issue and are desperately searching for a solution. Can anyone help?</div>
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<div>Thanks, Ben</div>
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<div>
<div>On 8 Mar 2011, at 21:55, <<a href="mailto:varnish-misc-request@varnish-cache.org">varnish-misc-request@varnish-cache.org</a>> <<a href="mailto:varnish-misc-request@varnish-cache.org">varnish-misc-request@varnish-cache.org</a>> wrote:</div>
<br class="Apple-interchange-newline">
<blockquote><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; ">-----Original
Message-----<br>
From:<span class="Apple-converted-space"> </span><a href="mailto:varnish-misc-bounces@varnish-cache.org">varnish-misc-bounces@varnish-cache.org</a><br>
[mailto:varnish-misc-bounces@varnish-cache.org] On Behalf Of Ronan<br>
Mullally<br>
Sent: March-08-11 3:38 PM<br>
To:<span class="Apple-converted-space"> </span><a href="mailto:varnish-misc@varnish-cache.org">varnish-misc@varnish-cache.org</a><br>
Subject: Varnish 503ing on ~1/100 POSTs<br>
<br>
I'm seeing intermittant 503s on POSTs to a fairly busy VBulletin<br>
website.<br>
The current load is light (up to a couple of thousand active sessions,<br>
peak is around five thousand). Varnish has a fairly simple config with<br>
a director consisting of two Apache backends:<br>
<br>
backend backend1 {<br>
.host = "1.2.3.4";<br>
.port = "80";<br>
.connect_timeout = 5s;<br>
.first_byte_timeout = 90s;<br>
.between_bytes_timeout = 90s;<br>
.probe = {<br>
.timeout = 5s;<br>
.interval = 5s;<br>
.window = 5;<br>
.threshold = 3;<br>
.request =<br>
"HEAD /favicon.ico HTTP/1.0"<br>
"X-Forwarded-For: 1.2.3.4"<br>
"Connection: close";<br>
}<br>
}<br>
<br>
backend backend2 {<br>
.host = "5.6.7.8";<br>
.port = "80";<br>
.connect_timeout = 5s;<br>
.first_byte_timeout = 90s;<br>
.between_bytes_timeout = 90s;<br>
.probe = {<br>
.timeout = 5s;<br>
.interval = 5s;<br>
.window = 5;<br>
.threshold = 3;<br>
.request =<br>
"HEAD /favicon.ico HTTP/1.0"<br>
"X-Forwarded-For: 5.6.7.8"<br>
"Connection: close";<br>
}<br>
}<br>
<br>
The numbers are modest, but significant - about 1 POST in a hundred<br>
fails.<br>
I've upped the backend timeouts to 90 seconds (first_byte /<br>
between_bytes)<br>
and I'm pretty confident they're responding in well under that time.<br>
<br>
varnishlog does not show any backend health changes. A typical event<br>
looks like:<br>
<br>
Varnish:<br>
a.b.c.d - - [08/Mar/2011:14:48:03 +0000] "POST<br>
<a href="http://www.sitename.net/newreply.php?do=postreply&t=285227">http://www.sitename.net/newreply.php?do=postreply&t=285227</a><span class="Apple-converted-space"> </span>HTTP/1.1" 503<br>
2623<br>
<br>
Backend:<br>
a.b.c.d - - [08/Mar/2011:14:48:03 +0000] "POST<br>
/newreply.php?do=postreply&t=285227 HTTP/1.1" 200 2686<br>
<br>
The POST appears to work fine on the backend but the user gets a 503<br>
from<br>
Varnish. It's not unusual to see users getting the error several times<br>
in<br>
a row (presumably re-submitting the post):<br>
<br>
a.b.c.d - - [08/Mar/2011:18:21:23 +0000] "POST<br>
<a href="http://www.sitename.net/editpost.php?do=updatepost&p=9405408">http://www.sitename.net/editpost.php?do=updatepost&p=9405408</a><span class="Apple-converted-space"> </span>HTTP/1.1"<br>
503 2623<br>
a.b.c.d - - [08/Mar/2011:18:21:36 +0000] "POST<br>
<a href="http://www.sitename.net/editpost.php?do=updatepost&p=9405408">http://www.sitename.net/editpost.php?do=updatepost&p=9405408</a><span class="Apple-converted-space"> </span>HTTP/1.1"<br>
503 2623<br>
a.b.c.d - - [08/Mar/2011:18:21:50 +0000] "POST<br>
<a href="http://www.sitename.net/editpost.php?do=updatepost&p=9405408">http://www.sitename.net/editpost.php?do=updatepost&p=9405408</a><span class="Apple-converted-space"> </span>HTTP/1.1"<br>
503 2623<br>
<br>
A typical request is below. The first attempt fails with:<br>
<br>
33 FetchError c http first read error: -1 0 (Success)<br>
<br>
there is presumably a restart and the second attempt (sometimes to<br>
backend1, sometimes backend2) fails with:<br>
<br>
33 FetchError c backend write error: 11 (Resource temporarily<br>
unavailable)<br>
<br>
This pattern has been the same on the few transactions I've examined in<br>
detail. The full log output of a typical request is below.<br>
<br>
I'm stumped. Has anybody got any ideas what might be causing this?<br>
<br>
<br>
-Ronan<br>
<br>
<br>
33 RxRequest c POST<br>
33 RxURL c /ajax.php<br>
33 RxProtocol c HTTP/1.1<br>
33 RxHeader c Accept: */*<br>
33 RxHeader c Accept-Language: nl-be<br>
33 RxHeader c Referer:<span class="Apple-converted-space"> </span><a href="http://www.redcafe.net/">http://www.redcafe.net/</a><br>
33 RxHeader c x-requested-with: XMLHttpRequest<br>
33 RxHeader c Content-Type: application/x-www-form-urlencoded;<br>
charset=UTF-8<br>
33 RxHeader c Accept-Encoding: gzip, deflate<br>
33 RxHeader c User-Agent: Mozilla/4.0 (compatible; ...)<br>
33 RxHeader c Host:<span class="Apple-converted-space"> </span><a href="http://www.sitename.net/">www.sitename.net</a><br>
33 RxHeader c Content-Length: 82<br>
33 RxHeader c Connection: Keep-Alive<br>
33 RxHeader c Cache-Control: no-cache<br>
33 RxHeader c Cookie: ...<br>
33 VCL_call c recv<br>
33 VCL_return c pass<br>
33 VCL_call c hash<br>
33 VCL_return c hash<br>
33 VCL_call c pass<br>
33 VCL_return c pass<br>
33 Backend c 44 backend backend1<br>
44 TxRequest b POST<br>
44 TxURL b /ajax.php<br>
44 TxProtocol b HTTP/1.1<br>
44 TxHeader b Accept: */*<br>
44 TxHeader b Accept-Language: nl-be<br>
44 TxHeader b Referer:<span class="Apple-converted-space"> </span><a href="http://www.sitename.net/">http://www.sitename.net/</a><br>
44 TxHeader b x-requested-with: XMLHttpRequest<br>
44 TxHeader b Content-Type: application/x-www-form-urlencoded;<br>
charset=UTF-8<br>
44 TxHeader b User-Agent: Mozilla/4.0 (compatible; ...)<br>
44 TxHeader b Host:<span class="Apple-converted-space"> </span><a href="http://www.sitename.net/">www.sitename.net</a><br>
44 TxHeader b Content-Length: 82<br>
44 TxHeader b Cache-Control: no-cache<br>
44 TxHeader b Cookie: ...<br>
44 TxHeader b Accept-Encoding: gzip<br>
44 TxHeader b X-Forwarded-For: a.b.c.d<br>
44 TxHeader b X-Varnish: 657185708<br>
* 33 FetchError c http first read error: -1 0 (Success)<br>
44 BackendClose b backend1<br>
33 Backend c 47 backend backend2<br>
47 TxRequest b POST<br>
47 TxURL b /ajax.php<br>
47 TxProtocol b HTTP/1.1<br>
47 TxHeader b Accept: */*<br>
47 TxHeader b Accept-Language: nl-be<br>
47 TxHeader b Referer:<span class="Apple-converted-space"> </span><a href="http://www.sitename.net/">http://www.sitename.net/</a><br>
47 TxHeader b x-requested-with: XMLHttpRequest<br>
47 TxHeader b Content-Type: application/x-www-form-urlencoded;<br>
charset=UTF-8<br>
47 TxHeader b User-Agent: Mozilla/4.0 (compatible; ...)<br>
47 TxHeader b Host:<span class="Apple-converted-space"> </span><a href="http://www.sitename.net/">www.sitename.net</a><br>
47 TxHeader b Content-Length: 82<br>
47 TxHeader b Cache-Control: no-cache<br>
47 TxHeader b Cookie: ...<br>
47 TxHeader b Accept-Encoding: gzip<br>
47 TxHeader b X-Forwarded-For: a.b.c.d<br>
47 TxHeader b X-Varnish: 657185708<br>
* 33 FetchError c backend write error: 11 (Resource temporarily<br>
unavailable)<br>
47 BackendClose b backend2<br>
33 VCL_call c error<br>
33 VCL_return c deliver<br>
33 VCL_call c deliver<br>
33 VCL_return c deliver<br>
33 TxProtocol c HTTP/1.1<br>
33 TxStatus c 503<br>
33 TxResponse c Service Unavailable<br>
33 TxHeader c Server: Varnish<br>
33 TxHeader c Retry-After: 0<br>
33 TxHeader c Content-Type: text/html; charset=utf-8<br>
33 TxHeader c Content-Length: 2623<br>
33 TxHeader c Date: Tue, 08 Mar 2011 17:08:33 GMT<br>
33 TxHeader c X-Varnish: 657185708<br>
33 TxHeader c Age: 3<br>
33 TxHeader c Via: 1.1 varnish<br>
33 TxHeader c Connection: close<br>
33 Length c 2623<br>
33 ReqEnd c 657185708 1299604110.559967279 1299604113.447372913<br>
0.000037670 2.887368441 0.000037193<br>
33 SessionClose c error<br>
33 StatSess c a.b.c.d 50044 3 1 1 0 1 0 235 2623</span></blockquote>
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