https://issues.apache.org/bugzilla/show_bug.cgi?id=48024
Summary: mod_sed consumes too much memory when used inside
reverse proxy and line sizes are very long e.g. 1-5M
Product: Apache httpd-2
Version: 2.3-HEAD
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
AssignedTo: [email protected]
ReportedBy: [email protected]
This has been reported to me by Bram <[email protected]>
When Apache is used as a reverse proxy and mod_sed is used to filter
to content and the output contains lines which are really long e.g
1M-4M chracters in single line, mod_sed consumes too much memory.
Here is the snips of the mail from Bram :
- 1 mb file with only a newline at the end
$ perl -we '$\="\x0D\x0A"; print "a" x (1 * 2 ** 20);' > /var/www/a.1.bin
When the file is downloaded apache uses 70 mb of memory
- 2 mb file with only a newline at the end:
$ perl -we '$\="\x0D\x0A"; print "a" x (2 * 2 ** 20);' > /var/www/a.2.bin
When the file is downloaded apache uses 277 mb of memory
- 3 mb file with only a newline at the end:
$ perl -we '$\="\x0D\x0A"; print "a" x (3 * 2 ** 20);' > /var/www/a.3.bin
When the file is downloaded apache uses 608 mb of memory
- 4 mb file with only a newline at the end:
$ perl -we '$\="\x0D\x0A"; print "a" x (4 * 2 ** 20);' > /var/www/a.2.bin
When the file is downloaded apache uses 1070 mb of memory
------------------------------------------------
I am able to reproduce the issue with following configuration :
LoadModule sed_module modules/mod_sed.so
LoadModule headers_module modules/mod_headers.so
LoadModule substitute_module modules/mod_substitute.so
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
ProxyPass / http://hostname:8080/
<Location />
Header unset Content-Length
SetOutputFilter Sed
OutputSed s/\(https:\/\/192.168.173.114\)\//\1:444\//g
</Location>
------------------------------------------------
The above doesn't have any impact if line sizes are small which is the typical
case with html or ascii text.
* Using core category because mod_sed component is not available.
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