02. ElasticSearch : Distributed Cluster

1. ElasticSearch
Distributed Cluster
http://elastic.openthinklabs.com/

2. An Empty Cluster

3. Cluster Health
GET /_cluster/health {
"cluster_name": "openthinklabs",
"status": "green",
"timed_out": false,
"number_of_nodes": 1,
"number_of_data_nodes": 1,
"active_primary_shards": 0,
"active_shards": 0,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 0,
"delayed_unassigned_shards": 0,
"number_of_pending_tasks": 0,
"number_of_in_flight_fetch": 0
}

4. Add an Index
PUT /blogs
{
"settings" : {
"number_of_shards" : 3,
"number_of_replicas" : 1
}
}

5. A single-node cluster with an index
GET /_cluster/health
{
"cluster_name": "openthinklabs",
"status": "yellow",
"timed_out": false,
"number_of_nodes": 1,
"number_of_data_nodes": 1,
"active_primary_shards": 4,
"active_shards": 4,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 4,
"delayed_unassigned_shards": 0,
"number_of_pending_tasks": 0,
"number_of_in_flight_fetch": 0
}

6. Add Failover

7. Scale Horizontally

8. Then Scale Some More
PUT /blogs/_settings
{
"number_of_replicas" : 2
}

9. Coping With Failure
Cluster after killing one node

10. Referensi
● ElasticSearch, The Definitive Guide, A
Distributed Real-Time Search and Analytics
Engine, Clinton Gormely & Zachary Tong,
O’Reilly