On 1/11/2016 8:45 AM, Gian Maria Ricci - aka Alkampfer wrote: > Due to the different reboot times probably, I’ve noticed that upon > reboot all three leader shards are on a single machine. I’m expecting > shard leaders to be distributed evenly between machines, because if > all shard leader are on a same machine, all new documents to index > will be routed to the same machine, thus indexing load is not subdivided.
You're looking for the REBALANCELEADERS functionality ... but because you only have three nodes, the fact that one machine has the leaders for all three shards is not really a problem. https://cwiki.apache.org/confluence/display/solr/Collections+API#CollectionsAPI-RebalanceLeaders This feature was added for a use case where there are hundreds of nodes and hundreds of total shards, with the leader roles heavily concentrated on a small number of nodes. With REBALANCELEADERS, the leader roles can be spread more evenly around the cluster. It is true that the shard leader does do a small amount of extra work, but for a very small installation like yours, the overhead is nothing to be concerned about. You can do something about it if it bothers you, though. Thanks, Shawn
