varnish-bugs at varnish-cache
Jun 19, 2012, 8:54 AM
Post #1 of 3
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#1158: graced objects serve very old objects
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#1158: graced objects serve very old objects
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Reporter: nicholas | Type: enhancement
Status: new | Priority: normal
Milestone: | Component: varnishd
Version: 3.0.2 | Severity: normal
Keywords: grace |
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Hello,
this is probably not a bug just surprising behaviour:
We had problems this morning, and served a fair amount of errors for some
while. Problem got solved, but error pages still got served at random
intervals.
We had
vcl_recv { set req.grace = 8h ...}
vcl_fetch { set beresp.grace = 8h ...}
and it looks like it picked very old objects every time it graced simple
requests while backend is healthy. IN normal operation we grace quite a
lot of concurrent objects. We would hope it picked the last available,
ordered by time. It looked like it picked ordered by time reverse.
We have now done the "if (req.backend.healthy)" checks indicated in
https://www.varnish-cache.org/trac/wiki/VCLExampleGrace
We took those out some years back when it was obvious that we didn't know
which backend was in use at the beginnning of the vcl. We now do the "if
(req.backend.healthy)" at the end of vcl_recv.
Is this the recommended way?
Nicholas
--
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1158>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator
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