i don't express myself well,
then i talk about in detail the whole process i understand, please help me to
check it
based on the configuration as below:
sub vcl_fetch {
if (!obj.cacheable) {
# Limit the lifetime of all 'hit for pass' objects to 10 seconds
obj.ttl = 10s;
pass;
}
}
1) after varnish get the object from the backend server, then the process will
enter the hook vcl_fetch accoding to the configuration code above
2) if the obj is not cacheable, then varnish switch to "pass mode" accoding to
the configuration code above
3) entering the pass model means varnish will get the object from the backend
server again?
在 2011年4月7日 下午6:10，Traian Bratucu
<[email protected]<mailto:[email protected]>>写道：
Please read the documentation you are referring to. You are talking about “hit
for pass” behaviour, it is clearly explained there, in English. Since I cannot
explain again in another language, please read it more carefully.
From: 彭伟 [mailto:[email protected]<mailto:[email protected]>]
Sent: Thursday, April 07, 2011 12:05 PM
To: Traian Bratucu
Cc: [email protected]<mailto:[email protected]>
Subject: Re: a possible dead cycle?
based on the configuration as below:
sub vcl_fetch {
if (!obj.cacheable) {
# Limit the lifetime of all 'hit for pass' objects to 10 seconds
obj.ttl = 10s;
pass;
}
}
when the object is not cacheable, then go to "pass" which means going to fetch
the object from the backend server again?
2011/4/7 Traian Bratucu
<[email protected]<mailto:[email protected]>>
No, if an object is not cacheable, it will simply not be cached (stored in
memory and later served from here instead of fetching from the backend), but IT
WILL BE DELIVERED to the client.
The only time varnish will re-fetch the object from the backend is on a new
client request.
Traian
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]<mailto:[email protected]>]
On Behalf Of ??
Sent: Thursday, April 07, 2011 11:25 AM
To: [email protected]<mailto:[email protected]>
Subject: a possible dead cycle?
when varnish fetch a page from backend server, and find it 's not
cacheable, so go to fetch the page from backend sever again?
and find it 's not cacheable again , so again and agian .......?
please help me! thanks !
Regards!
pwlazy
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