Elasticsearch top master (10) - illustrates a lateral expansion processes, expansion beyond the limits of how, and how to improve fault tolerance

1 illustrates a lateral expansion processes, expansion beyond the limits of how, and how to improve fault tolerance

1. primary & replica automatic load balancing, 6 shard, 3 th primary, 3 th replica
2. Each node has more shard, IO / CPU / Memory resources allocated to each shard more and better each shard performance
3. Expansion limit, 6 shard (3 primary, 3 replica), expandable to up to six machines, each shard can take up all the resources of a single server, the best performance
4. Expansion exceeds the limit, the number of dynamic modification Replica, 9 th Shard (3 th primary, 6 th Replica), 9 to expansion machines, machines than 3, has three times the throughput.
5. Under the three machines, 9 shard (3 Primary th, 6 Replica), fewer resources, but better fault tolerance, up to 2 machines down, six receiving 0 shard only machine downtime