1000-2000 Redirects in Obj.conf - Performance Issues?

Question

I'm potentially going to have upwards of 1000 redirects in obj.conf.
I assume there is no maximum number of redirects, but I'm worried about performance.
Will there be a significant impact on server start up time?
Also, I imagine that Sun One caches this config file to memory once - is that assumption correct?
Is it possible for a large number of entries in obj.conf to result in a performance hit on each page?

Answer 1

It would probably make sense to move the redirects to a separate configuration file (for ease of administration) and only to check for a redirect if the original URL would result in a 404 (to improve request-time performance). This is possible in Sun Java System Web Server 7.0, but not in earlier versions, by adding the following directives to the default object:<If $code = "404" and lookup('redirect.conf', $uri)>
Error fn="redirect" url="$(lookup('redirect.conf', $uri))"
</If>Where redirect.conf is a file that contains the URIs from which to redirect and the associated URLs to redirect to:# redirect.conf
/foo /bar
/old/index.html /new/index.jspIf the redirects are isolated to a relatively small number of directories, you can improve performance even in earlier versions of Web Server (e.g. Web Server 6.x) by moving the directives out of the default object and into path-specific objects. For example, consider the following:<Object name="default">
NameTrans fn="redirect" from="/foo/1" url="/new/A"
NameTrans fn="redirect" from="/bar/A" url="/new/1"
NameTrans fn="redirect" from="/foo/2" url="/new/B"
NameTrans fn="redirect" from="/foo/3" url="/new/C"
NameTrans fn="redirect" from="/bar/B" url="/new/2"
NameTrans fn="document-root" root="$docroot"
</Object>The above could be written as follows for improved performance:<Object ppath="/foo/*">
NameTrans fn="redirect" from="/foo/1" url="/new/A"
NameTrans fn="redirect" from="/foo/2" url="/new/B"
NameTrans fn="redirect" from="/foo/3" url="/new/C"
</Object>
<Object ppath="/bar/*">
NameTrans fn="redirect" from="/bar/A" url="/new/1"
NameTrans fn="redirect" from="/bar/B" url="/new/2"
</Object>
<Object name="default">
NameTrans fn="document-root" root="$docroot"
</Object>