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ITS#6152 pcache enhancements
- To: OpenLDAP Devel <firstname.lastname@example.org>
- Subject: ITS#6152 pcache enhancements
- From: Howard Chu <email@example.com>
- Date: Sun, 16 Aug 2009 13:22:16 -0700
- User-agent: Mozilla/5.0 (X11; U; Linux x86_64; rv:1.9.1b5pre) Gecko/20090809 SeaMonkey/2.0a1pre Firefox/3.0.3
Just starting to look at implementing Time-To-Refresh, and wondering how it
impacts other parameters.
proxysavequeries allows queries to be saved and reloaded across restarts.
Currently it will only reload non-expired queries. The implication of setting
the offline mode is that expired entries may remain in the cache. Should they
in fact be reloadable too?
The proxytemplate directive has gotten a bit cumbersome, with optional
negative TTL and sizelimit TTL added on. This would be the natural place to
add the TTR config as well. Should there be independent TTR for negative and
sizelimit too? (And it seems we should move from positional arguments to named
Given the existence of a TTR feature, I'm less concerned about the
proxysavequeries behavior. One should simply set a long TTL and set TTR as
needed to keep the cache fresh.
As a side point, I'd prefer more consistency in the config keyword names, we
should have used "pcache" as the prefix for all the keywords...
pcache <database> ...
pcacheattrset <index> ...
pcacheset template=<string> attrset=<index> ttl=<secs> [negttl=<secs>] ...
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/