: Are any of you using Solr Http caching? I am interested to see how people : use this functionality. I have an index that basically changes once a day : at midnight. Is it okay to enable Solr Http caching for such an index and : set the max age to 1 day? Any potential issues? : : I am using solr 3.5 with SolrJ.
in a past life i put squid in front of solr as an accelerator. i didn't bother configuring solr to output expiration info in the Cache-Control header, i just took advantage of the etag generated from the index version (as well as lastModifiedFrom="openTime") to ensure tha Solr would short circut and return a 304 w/o doing any processing (or wasting a lot of bandwidth returning data) anytime it got an If-Modified-Since or If-None-Match request indicating that the cache already had a current copy. If you know your index only changes ever 24 hours, then setting a max-age would probably make sense, to elimianate even those conditional requests, but i wouldn't set it to 24H (what if a request happens 1 minute before your daily rebuild?) set it to whatever the longest amount of time you are willing to serve stale results. -Hoss
