Thanks for the answers. 2013/4/23 Erick Erickson <erickerick...@gmail.com>
> bq: However what will happen to that 10 nodes when I specify replication > factor? > > > I think they just sit around doing nothing. > > Best > Erick > > On Mon, Apr 22, 2013 at 7:24 AM, Furkan KAMACI <furkankam...@gmail.com> > wrote: > > Sorry but if I have 10 shards and a collection with replication factor > of 1 > > and if I start up 30 nodes what happens to that last 10 nodes? I mean: > > > > 10 nodes as leader > > 10 nodes as replica > > > > if I don't specify replication factor there was going to be a round robin > > system that assigns other 10 machine as: > > + 10 nodes as replica > > > > However what will happen to that 10 nodes when I specify replication > factor? > > > > > > 2013/4/22 Erick Erickson <erickerick...@gmail.com> > > > >> 1) Imagine you have lots and lots and lots of different Solr indexes > >> and a 50 node cluster. Further imagine that one of those indexes has 2 > >> shards, and a leader + shard is adequate to handle the load. You need > >> some way to limit the number of nodes your index gets distributed to, > >> that's what replicationFactor is for. So in this case > >> replicationFactor=2 will stop assigning nodes to that particular > >> collection after there's a leader + 1 replica > >> > >> 2> In the system you described, there won't be more than one > >> shard/node. But one strategy for growth is to "overshard". That is, in > >> the early days you put (numbers from thin air) 10 shards/node and they > >> are all quite small. As your index grows, you move to two nodes with 5 > >> shards each. And later to 5 nodes with 2 shards and so on. There are > >> cases where you want some way to make the most of your hardware yet > >> plan for expansion. > >> > >> Best > >> Erick > >> > >> On Sun, Apr 21, 2013 at 3:51 PM, Furkan KAMACI <furkankam...@gmail.com> > >> wrote: > >> > I know that: when using SolrCloud we define the number of shards into > the > >> > system. When we start up new Solr instances each one will be a a > leader > >> for > >> > a shard, and if I continue to start up new Solr instances (that has > >> > exceeded the number number of shards) each one will be a replica for > each > >> > leader as a round robin process. > >> > > >> > However when I read wiki there are two parameters: *replicationFactor > >> *and * > >> > maxShardsPerNode. > >> > > >> > *1) Can you give details about what are they. If all newly added Solr > >> > instances becomes a replica what is that replication factor for? > >> > 2) If what I wrote is true about that round robin process what is > that * > >> > maxShardsPerNode*? How can be more than one shard at the system I > >> described? > >> >
