bugzilla at apache
Aug 23, 2012, 8:28 AM
Post #1 of 1
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[Bug 53767] New: htcacheclean deletes stale "vary" header files even if cache limits aren't reached
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https://issues.apache.org/bugzilla/show_bug.cgi?id=53767
Priority: P2
Bug ID: 53767
Assignee: bugs [at] httpd
Summary: htcacheclean deletes stale "vary" header files even if
cache limits aren't reached
Severity: normal
Classification: Unclassified
OS: Linux
Reporter: andy.hutson+apache [at] gmail
Hardware: PC
Status: NEW
Version: 2.2.21
Component: mod_cache_disk / mod_disk_cache
Product: Apache httpd-2
Created attachment 29268
--> https://issues.apache.org/bugzilla/attachment.cgi?id=29268&action=edit
strace output
For a resource that contains a "Vary" header, mod_cache creates a .header file
containing the "vary" headers, and then creates a subdirectory
(<hash>.header.vary), which in turn contains the actual .header and .data
files.
Assuming the cache is not above the limit specified by htcacheclean, stale
content should remain in place so that it can be while revalidating content or
if there's an error (ie CacheStaleOnError behaviour). For non-varying
resources, this works fine.
However, for resources that "vary", it appears there is a bug in htcacheclean.
Once the content is stale, it deletes the top level .header file (containing
the "vary" headers), even if the cache is within limits, meaning mod_cache is
unable to serve the stale content (htcacheclean reports "0 entries deleted"
though). It would appear that creating an empty .data file alongside the
.header file prevents this from happening.
I'm attaching the output of the following, for reference, which shows the
unlink call at line 173:
strace -o ~/strace.out -s 512 htcacheclean -r -v -p /data/httpcache/httpd/ -l
1000k
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