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Re: [PATCH 0 of 5] cache patches

António P. P. Almeida
December 11, 2011 07:10PM
On 11 Dez 2011 16h01 WET, mdounin@mdounin.ru wrote:

Hello Maxim,

> Hello!
>
> Here are patch series which addresses several issues in cache
> (first 3 patches), and adds cache lock support (last 2).
>
> I'm planning to commit first 3 patches shortly, cache lock patches
> will remain experimental for a while. Review and testing
> appreciated.

I will. If I understood correctly the later two patches implement a
locking mechanism so that if /foobar is not cached and there are 5
requests for foobar in time interval below the cache lock timeout then
only the first request goes upstream the other requests are queued and
are served up when the upstream returns a response.

Example:

location /foobar {

# usual proxy cache stuff...

proxy_cache_lock on;
proxy_cache_lock_timeout 500; # the default, can be tweaked
proxy_pass http://my_upstream;
}

1. Request for /foobar comes in at t=0

2. Additional request for /foobar comes in at t=200ms

3. Additional request for /foobar comes in at t=220ms

Requests 2 and 3 are queued by the cache manager. Request 1 is
forwarded upstream. When a response arrives, requests 2 and 3 are
served.

For the moment the cache entries that are updating will use the
current 'proxy_cache_use_stale updating' setting.

Thanks,
--- appa

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Subject Author Views Posted

[PATCH 0 of 5] cache patches

Maxim Dounin 1428 December 11, 2011 10:06AM

[PATCH 1 of 5] Cache: obsolete code removed

Maxim Dounin 511 December 11, 2011 10:06AM

[PATCH 2 of 5] Cache: handling of cache files with long headers

Maxim Dounin 667 December 11, 2011 10:06AM

[PATCH 3 of 5] Cache: only complain on long locked entries

Maxim Dounin 687 December 11, 2011 10:06AM

[PATCH 4 of 5] Cache locks initial implementation

Maxim Dounin 638 December 11, 2011 10:06AM

[PATCH 5 of 5] Cache lock support for fastcgi, scgi, uwsgi

Maxim Dounin 508 December 11, 2011 10:08AM

Re: [PATCH 0 of 5] cache patches

fanboy 625 December 11, 2011 07:00PM

Re: [PATCH 0 of 5] cache patches

Maxim Dounin 484 December 12, 2011 04:54AM

Re: [PATCH 0 of 5] cache patches

António P. P. Almeida 534 December 11, 2011 07:10PM

Re: [PATCH 0 of 5] cache patches

Maxim Dounin 509 December 12, 2011 05:02AM

Re: [PATCH 0 of 5] cache patches

António P. P. Almeida 498 December 12, 2011 05:28AM

Re: [PATCH 0 of 5] cache patches

Maxim Dounin 530 December 12, 2011 05:36AM

Re: [PATCH 0 of 5] cache patches

António P. P. Almeida 817 December 13, 2011 02:42PM



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