There are no arbitrary limits on the number of collections but yes there are practical limits. For example, the cluster state can become a bottleneck. There is a lot of work happening on finding and addressing these problems. See https://issues.apache.org/jira/browse/SOLR-5381
Boot up time is because of: 1) Core discovery, schema/config parsing etc 2) Transaction log replay on startup 3) Wait time for enough replicas to become available before leader election happens You can't do much about 1 right now I think. For #2, you can keep your transaction logs smaller by a hard commit before shutdown. For #3 there is a leaderVoteWait settings but I'd rather not touch that unless it becomes a problem. On Fri, Mar 21, 2014 at 1:39 AM, Chris W <chris1980....@gmail.com> wrote: > Hi there > > Is there a limit on the # of collections solrcloud can support? Can > zk/solrcloud handle 1000s of collections? > > Also i see that the bootup time of solrcloud increases with increase in # > of cores. I do not have any expensive warm up queries. How do i speedup > solr startup? > > -- > Best > -- > C -- Regards, Shalin Shekhar Mangar.
