Thanks Erick. Suppose I have 5 hosts h1,h2,h3,h4,h5 and want to create a 5X2 solr cloud of 5 shards, 2 replicas per shard. On each host I will run two solr JVMs, each hosts a single solr core. Solr's default 'snitch' provide a 'host' tag, so I wonder if I can use it to prevent any host from have two replicas from the same shard, when creating collection:
/solr/admin/collections?action=CREATE&name=mycollection&numShards=5&replicationFactor=2&maxShardsPerNode=1&rule=shard:*, replica<2, host:* Is this the correct way to use 'snitch'? I cannot find more relevant documentation on how to configure and customize 'snitch'. Thanks, Wei On Sun, Sep 2, 2018 at 9:30 PM Erick Erickson <erickerick...@gmail.com> wrote: > You need to provide a "snitch" and define a rule appropriately. This > is a variant of "rack awareness". > > Solr considers two JVMs running on the same physical host as > completely separate Solr instances, so to get replicas on different > hosts you need a snitch etc. > > Best, > Erick > On Sun, Sep 2, 2018 at 4:39 PM Wei <weiwan...@gmail.com> wrote: > > > > Hi, > > > > In rule based replica placement, how to ensure there are no more than > one > > replica for any shard on the same host? In the documentation there is > an > > example rule > > > > shard:*,replica:<2,node:* > > > > Does 'node' refer to solr instance or actual physical host? Is there an > > example for defining the physical host? > > > > Thanks, > > Wei >
