| What is mod_log_spread? |
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mod_log_spread is a patch to Apache's mod_log_config, which provides an
interface for spread to multicast access logs. It utilizes the group
communication toolkit Spread, developed
at Johns Hopkins University's Center for Networking and Distributed Systems.
mod_log_spread was developed to solve the problem of collecting consolidated
access logs for large web farms. In particular, the solution needed to be
scalable to hundreds of machines, utilize a reliable network transport, allow
machines to added or dropped on the fly, and impose minimal performance impact on
the webservers. Current version is 1.0.4.
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| What are other Spread logging projects? |
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In addition to the apache module, we also have a patch for the lightweight
web server thttpd to allow
similair logging capabilities. If you're running spread on a highly utilized
Linux system, you may benefit from setting our spread daemon to real-time
scheduling. Here's a perl module to make that easy to accomplish.
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| Availability |
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mod_log_spread is available under an apache style license.
Basically, redistribution is permitted as long as the copyright is preserved
and included intact. In addition, the authors of Spread have provided an
unlimited
use license for using Spread to log web requests. Thanks CNDS!
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| ChangeLog |
- 2000-05-27 Fixed brown-paper-bag parse error.
- 2000-06-04 Added perl scheduler interface for Linux to help running spread
in realtime.
- 2000-06-07 Added spread tuning docs. Fixed potential issue of inedfinetly blocking on SP_multicast if Spread's queue is full.
- 2000-07-14 Added Theo Schlossnagle's wonderful spreadlogd to the dist as a replacement to log_writer.
- 2000-09-24 mod_log_spread becomes part of the Backhand Project!
- 2000-10-14 Added vhost support. Fixed potential hang.
- 2001-03-20 Fixed bug with handling piped logs.
- 2001-03-24 Fixed compatability with Spread-3.15.
- 2001-03-31 Added multiple spread daemon and failover support.
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