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From: Nuno Fernandes <npf-mlists@eurotux.com>
To: users@httpd.apache.org
Date: Tue, 9 Jun 2009 22:24:46 +0100
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Subject: [users@httpd] mod_disk_cache - Temporary files when 32000 subdirs
 limit is reached

Hi,

I'm using httpd.x86_64-2.2.3-22.el5.centos to serve the content of a backend 
web server.

I'm using mod_proxy + mod_disk_cache to cache the content (only public images) 
to be served.

    CacheRoot "/var/cache/httpd/mod_proxy"
    CacheEnable disk /i/i
    CacheDirLevels 5
    CacheDirLength 3
    CacheMinFileSize 1
    CacheMaxFileSize 1000000
    CacheIgnoreNoLastMod On

    CacheIgnoreHeaders Set-Cookie
    CacheIgnoreHeaders Cookie
    CacheIgnoreHeaders RequestID
    CacheIgnoreHeaders TimeReq
    CacheIgnoreHeaders User-Agent
    CacheIgnoreHeaders Accept-Encoding
    CacheIgnoreHeaders Warning
    CacheIgnoreHeaders Via
    CacheIgnoreHeaders Max-Forwards
    CacheIgnoreHeaders UA-CPU
    CacheIgnoreHeaders Referer
    CacheIgnoreHeaders X-Forwarded-For

When the 32000 sub dirs limit is reached, i get the following errors in 
error_log:

[Tue Jun 09 22:19:23 2009] [error] (2)No such file or directory: disk_cache: 
rename tempfile to hdrsfile failed: /var/cache/httpd/mod_proxy/aptmpfddU8r -> 
/var/cache/httpd/mod_proxy/xWP/E9D/HS@/W_G/WD8/oBQ1iaA.header
[Tue Jun 09 22:19:23 2009] [error] (2)No such file or directory: disk_cache: 
rename tempfile to hdrsfile failed: /var/cache/httpd/mod_proxy/aptmpgPLPkx -> 
/var/cache/httpd/mod_proxy/n4R/Ldr/eFp/w@K/iPx/QDmvxAQ.header
[Tue Jun 09 22:19:25 2009] [error] (2)No such file or directory: disk_cache: 
rename tempfile to hdrsfile failed: /var/cache/httpd/mod_proxy/aptmphMok4K -> 
/var/cache/httpd/mod_proxy/bY7/yUi/Acf/Xpa/6vg/FUNAjYg.header

And lots of temporary files remain in cacherootdir:

# ls aptmp*|wc -l
83296

I'm using cachedirlevels = 5 so that the tree of directories is deep. But the 
problem is that all the requests go to a separated directory:

.
./aptmpAEh15q
./2fv
./2fv/IJD
./2fv/IJD/JJ3
./2fv/IJD/JJ3/HHe
./2fv/IJD/JJ3/HHe/1v8
./2fv/IJD/JJ3/HHe/1v8/2EVlBaA.header
./2fv/IJD/JJ3/HHe/1v8/2EVlBaA.data
./6TQ
./6TQ/rxa
./6TQ/rxa/bqo
./6TQ/rxa/bqo/qhN
./6TQ/rxa/bqo/qhN/gf_
./6TQ/rxa/bqo/qhN/gf_/hoqm_QA.data
./6TQ/rxa/bqo/qhN/gf_/hoqm_QA.header
./aptmpk1CjXf
./v3Y
./v3Y/FPA
./v3Y/FPA/D7K
./v3Y/FPA/D7K/63I
./v3Y/FPA/D7K/63I/aEq
./v3Y/FPA/D7K/63I/aEq/1NFtYwA.header
./v3Y/FPA/D7K/63I/aEq/1NFtYwA.data

I don't find two request files in the same directory.

Thanks for any info.

Best regards,
Nuno Fernandes


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