We've tried it. There doesn't seem to be any connection between GC and the bad performance spikes.
Otis Gospodnetic wrote: > > OK. Then it's likely not this. You saw the other response about looking > at GC to see if maybe that hits you once in a while and slows whatever > queries are in flight? Try jconsole. > > Otis > -- > Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch > > > > ----- Original Message ---- >> From: oleg_gnatovskiy <oleg_gnatovs...@citysearch.com> >> To: solr-user@lucene.apache.org >> Sent: Thursday, January 22, 2009 2:43:31 PM >> Subject: Re: Query Performance while updating teh index >> >> >> We do optimize the index before updates but we get tehse performance >> issues >> even when we pull an empty snapshot. Thus even when our update is tiny, >> the >> performance issues still happen. >> >> >> >> Otis Gospodnetic wrote: >> > >> > This is an old and long thread, and I no longer recall what the >> specific >> > suggestions were. >> > My guess is this has to do with the OS cache of your index files. When >> > you make the large index update, that OS cache is useless (old files >> are >> > gone, new ones are in) and the OS cache has get re-warmed and this >> takes >> > time. >> > >> > Are you optimizing your index before the update? Do you *really* need >> to >> > do that? >> > How large is your update, what makes it big, and could you make it >> > smaller? >> > >> > Otis >> > -- >> > Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch >> > >> > >> > >> > ----- Original Message ---- >> >> From: oleg_gnatovskiy >> >> To: solr-user@lucene.apache.org >> >> Sent: Tuesday, January 20, 2009 6:19:46 PM >> >> Subject: Re: Query Performance while updating teh index >> >> >> >> >> >> Hello again. It seems that we are still having these problems. Queries >> >> take >> >> as long as 20 minutes to get back to their average response time after >> a >> >> large index update, so it doesn't seem like the problem is the 12 >> second >> >> autowarm time. Are there any more suggestions for things we can try? >> >> Taking >> >> our servers out of teh loop for as long as 20 minutes is a bit of a >> >> hassle, >> >> and a risk. >> >> -- >> >> View this message in context: >> >> >> http://www.nabble.com/Query-Performance-while-updating-the-index-tp20452835p21573927.html >> >> Sent from the Solr - User mailing list archive at Nabble.com. >> > >> > >> > >> >> -- >> View this message in context: >> http://www.nabble.com/Query-Performance-while-updating-the-index-tp20452835p21611642.html >> Sent from the Solr - User mailing list archive at Nabble.com. > > > -- View this message in context: http://www.nabble.com/Query-Performance-while-updating-the-index-tp20452835p21611976.html Sent from the Solr - User mailing list archive at Nabble.com.
