Maintenance Questions: In a two slave one master setup where the two slaves are behind load balancers what happens if I have to restart solr? If I have to restart solr say for a schema update where I have added a new field then what is the recommended procedure?
If I can guarantee no commits or optimizes happen on the master during the schema update so no new snapshots become available then can I safely leave rsyncd enabled? When I stop and start a slave server, should I first pull it out of the load balancers list or will solr gracefully release connections as it shuts down so no searches are lost? What do you guys do to push out updates? Thanks for any thoughts, Robi -----Original Message----- From: Walter Underwood [mailto:wun...@wunderwood.org] Sent: Tuesday, August 04, 2009 8:57 AM To: solr-user@lucene.apache.org Subject: Re: 99.9% uptime requirement Right. You don't get to 99.9% by assuming that an 8 hour outage is OK. Design for continuous uptime, with plans for how long it takes to patch around a single point of failure. For example, if your load balancer is a single point of failure, make sure that you can redirect the front end servers to a single Solr server in much less than 8 hours. Also, think about your SLA. Can the search index be more than 8 hours stale? How quickly do you need to be able to replace a failed indexing server? You might be able to run indexing locally on each search server if they are lightly loaded. wunder On Aug 4, 2009, at 7:11 AM, Norberto Meijome wrote: > On Mon, 3 Aug 2009 13:15:44 -0700 > "Robert Petersen" <rober...@buy.com> wrote: > >> Thanks all, I figured there would be more talk about daemontools if >> there >> were really a need. I appreciate the input and for starters we'll >> put two >> slaves behind a load balancer and grow it from there. >> > > Robert, > not taking away from daemon tools, but daemon tools won't help you > if your > whole server goes down. > > don't put all your eggs in one basket - several > servers, load balancer (hardware load balancers x 2, haproxy, etc) > > and sure, use daemon tools to keep your services running within each > server... > > B > _________________________ > {Beto|Norberto|Numard} Meijome > > "Why do you sit there looking like an envelope without any address > on it?" > Mark Twain > > I speak for myself, not my employer. Contents may be hot. Slippery > when wet. > Reading disclaimers makes you go blind. Writing them is worse. You > have been > Warned. >
