Elasticsearch - Cluster APIs - elasticsearch - elasticsearch tutorial - elastic search



Elasticsearch Cluster APIs

  • Most cluster level APIs allow to specify which nodes to execute on (for example, getting the node stats for a node).
  • Nodes can be identified in the APIs either using their internal node id, the node name, address, custom attributes, or just the _local node receiving the request.
  • learn elasticsearch tutorials - node cluster

    learn elasticsearch tutorials - node cluster Example

For example:

GET http://localhost:9200/_nodes/_local
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Response

{
   "cluster_name":"elasticsearch", "nodes":{
      "Vy3KxqcHQdm4cIM22U1ewA":{
         "name":"Red Guardian", "transport_address":"127.0.0.1:9300", 
         "host":"127.0.0.1", "ip":"127.0.0.1", "version":"2.1.1", 
         "build":"40e2c53", "http_address":"127.0.0.1:9200",
      }
   }
}
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elastic search - cluster

Or

Response

  • Same as in the above example.

Cluster Health

  • This API is used to get the status on the health of the cluster by appending health keyword.

For example:

GET http://localhost:9200/_cluster/health
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Response

{
   "cluster_name":"elasticsearch", "status":"yellow", "timed_out":false,
   "number_of_nodes":1, "number_of_data_nodes":1, "active_primary_shards":23,
   "active_shards":23, "relocating_shards":0, "initializing_shards":0,
   "unassigned_shards":23, "delayed_unassigned_shards":0, "number_of_pending_tasks":0,
   "number_of_in_flight_fetch":0, "task_max_waiting_in_queue_millis":0,
   "active_shards_percent_as_number":50.0
}
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Cluster State

  • This API is used to get state information about a cluster by appending ‘state’ keyword URL.
  • The state information contains version, master node, other nodes, routing table, metadata and blocks.
learn elasticsearch tutorials - elasticsearch clusters indexers

learn elasticsearch tutorials - elasticsearch clusters indexers Example

For example:

GET http://localhost:9200/_cluster/state 10. Elasticsearch - Cluster APIs
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Response

{
   "cluster_name":"elasticsearch", "version":27, "state_uuid":"B3P7uHGKQUGsSsiX2rGYUQ",
   "master_node":"Vy3KxqcHQdm4cIM22U1ewA",
	
}
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Cluster Stats

  • This API helps to retrieve statistics about cluster by using ‘stats’ keyword.
  • This API returns shard number, store size, memory usage, number of nodes, roles, OS, and file system.

For example:

GET http://localhost:9200/_cluster/stats
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Response

{
   "timestamp":1454496710020, "cluster_name":"elasticsearch", "status":"yellow",
   "indices":{
      "count":5, "shards":{
         "total":23, "primaries":23, "replication":0.0,"
      }
   }
}
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Pending Cluster Tasks

  • This API is used for monitoring pending tasks in any cluster.
  • Tasks are like create index, update mapping, allocate shard, fail shard etc.
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For example:

GET http://localhost:9200/_cluster/pending_tasks
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Cluster Reroute

  • This API is used for moving shard from one node to another or to cancel any allocation or allocate any unassigned shard.

For example:

POST http://localhost:9200/_cluster/reroute
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Request Body

{
   "commands" : [ 
      {
         "move" :
         {
            "index" : "schools", "shard" : 2,
            "from_node" : "nodea", "to_node" : "nodeb"
         }
      },
		
      {
         "allocate" : {
            "index" : "test", "shard" : 1, "node" : "nodec"
         }
      }
   ]
}
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Cluster Update Settings

  • This API allows you to update the settings of a cluster by using settings keyword.
  • There are two types of settings - persistent (applied across restarts) and transient (do not survive a full cluster restart).

Cluster APIs: Node specification

  • Most cluster level APIs allow to specify which nodes to execute on (for example, getting the node stats for a node).
  • Nodes can be identified in the APIs either using their internal node id, the node name, address, custom attributes, or just the _local node receiving the request.
  • For example, here are some sample executions of nodes info:
# Local
curl localhost:9200/_nodes/_local
# Address
curl localhost:9200/_nodes/10.0.0.3,10.0.0.4
curl localhost:9200/_nodes/10.0.0.*
# Names
curl localhost:9200/_nodes/node_name_goes_here
curl localhost:9200/_nodes/node_name_goes_*
# Attributes (set something like node.rack: 2 in the config)
curl localhost:9200/_nodes/rack:2
curl localhost:9200/_nodes/ra*:2
curl localhost:9200/_nodes/ra*:2*
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Node Stats

  • This API is used to retrieve the statistics of one more nodes of the cluster.
  • Node stats are almost the same as cluster.
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For example:

GET http://localhost:9200/_nodes/stats
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Response

{
   "cluster_name":"elasticsearch", "nodes":{
      "Vy3KxqcHQdm4cIM22U1ewA":{
         "timestamp":1454497097572, "name":"Red Guardian", 
         "transport_address":"127.0.0.1:9300", "host":"127.0.0.1", "ip":["127.0.0.1:9300",
      }
   }
}
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Nodes hot_threads

  • This API helps you to retrieve information about the current hot threads on each node in cluster.
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For example:

GET http://localhost:9200/_nodes/hot_threads
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Response

{Red Guardian} {Vy3KxqcHQdm4cIM22U1ewA} {127.0.0.1}{127.0.0.1:9300}Hot threads at 
   2016-02-03T10:59:48.856Z, interval = 500ms, busiestThreads = 3, 
   ignoreIdleThreads = true:0.0% (0s out of 500ms) cpu usage by thread 'Attach Listener'
      unique snapshot
      unique snapshot
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