Bug 54015

Summary:	Combined (bytes received + bytes sent) logging directive
Product:	Apache httpd-2	Reporter:	Martijn T. <apache_bugzilla>
Component:	mod_logio	Assignee:	Apache HTTPD Bugs Mailing List <bugs>
Status:	RESOLVED FIXED
Severity:	enhancement	CC:	apache_bugzilla
Priority:	P2	Keywords:	FixedInTrunk
Version:	2.2.23
Target Milestone:	---
Hardware:	All
OS:	All

Description Martijn T. 2012-10-16 19:35:57 UTC

mod_logio currently adds two logging directives: %I for bytes received (in) and %O for bytes sent (out). They are very handy in several situations. However, many packages that help the user translate the access logs into statistics, only provide for a single 'byte counter' when reading access_log, as by popular and accepted log formats.

Before mod_logio was available this counter was usually used to count %b, which doesn't include received bytes, and is inaccurate on partial downloads (it implies '100 MB sent' when a 100 MB file download is cancelled after 5 MB for example).

It seems that some distributions (at least Ubuntu) now include %O instead of %b to accurately record true sent bytes, but this still completely leaves out received bytes.

I would like to suggest adding a logging directive that has the cumulative result of %I and %O so that:
- sent and received data can be measured with the currently available packages for statistics;
- this data can be recorded with those tools, without adding extra columns/data to the already available and well accepted log formats.

Comment 1 Martijn T. 2012-10-17 10:06:52 UTC

I forgot: wasn't sure what version I should put this on. I would certainly like to see this in currently maintained versions of Apache.

Mostly because it is a more elegant way (perhaps also faster and less error prone) of getting the sum of in+out than piping all our logs (with seperate %I and %O) through a Perl script just to combine the two values.

Comment 2 Christophe JAILLET 2013-05-21 19:28:10 UTC

A patch that adds a new %C (combined) format specifier has been pushed to trunk.

See r1484910.

Comment 3 Christophe JAILLET 2013-10-02 15:49:52 UTC

This has been backported to 2.4.X branch in r1523269.

It will be part of 2.4.7