How to check the Elasticsearch node's RAM details

Question

I have given with an ES link and some of my ES queries are timing out on that. As the first step of my debugging, I want to know the RAM configuration of my ES nodes. 
Is there any API available which gives that information for me?

Karthik Divi · Accepted Answer

Elasticsearch has `/stats` endpoint to know the Node stats. You can eighter know one particular node's stats by running the following

```sh
GET /_nodes/nodeId_1,nodeId_2/stats
```
or you can get all node stats by running the following

```sh
GET /_nodes/stats
```

This gives a verbose output. If you are looking for memory information you can actually check for `JVM stats` by running the following

```sh
GET /_nodes/stats/jvm
```
For example, if you are running Elasticsearch on local with default port 9200 then you can call the following URL

http://localhost:9200/_nodes/stats/jvm

This gives the following output, from that you can check for `heap_max_in_bytes`

```json
{
	"_nodes": {
		"total": 1,
		"successful": 1,
		"failed": 0
	},
	"cluster_name": "elasticsearch_username",
	"nodes": {
		"ngeh7O8lSD6qmDXFi8P2kg": {
			"timestamp": 1563889858693,
			"name": "ngeh7O8",
			"transport_address": "127.0.0.1:9300",
			"host": "127.0.0.1",
			"ip": "127.0.0.1:9300",
			"roles": ["master", "data", "ingest"],
			"jvm": {
				"timestamp": 1563889858693,
				"uptime_in_millis": 51725,
				"mem": {
					"heap_used_in_bytes": 159842296,
					"heap_used_percent": 15,
					"heap_committed_in_bytes": 1037959168,
					"heap_max_in_bytes": 1037959168,
					"non_heap_used_in_bytes": 73089592,
					"non_heap_committed_in_bytes": 78700544,
					"pools": {
						"young": {
							"used_in_bytes": 83530696,
							"max_in_bytes": 286326784,
							"peak_used_in_bytes": 286326784,
							"peak_max_in_bytes": 286326784
						},
						"survivor": {
							"used_in_bytes": 35782656,
							"max_in_bytes": 35782656,
							"peak_used_in_bytes": 35782656,
							"peak_max_in_bytes": 35782656
						},
						"old": {
							"used_in_bytes": 40528944,
							"max_in_bytes": 715849728,
							"peak_used_in_bytes": 40528944,
							"peak_max_in_bytes": 715849728
						}
					}
				},
				"threads": {
					"count": 76,
					"peak_count": 76
				},
				"gc": {
					"collectors": {
						"young": {
							"collection_count": 5,
							"collection_time_in_millis": 83
						},
						"old": {
							"collection_count": 1,
							"collection_time_in_millis": 32
						}
					}
				},
				"buffer_pools": {
					"direct": {
						"count": 27,
						"used_in_bytes": 16873440,
						"total_capacity_in_bytes": 16873439
					},
					"mapped": {
						"count": 209,
						"used_in_bytes": 2084221872,
						"total_capacity_in_bytes": 2084221872
					}
				},
				"classes": {
					"current_loaded_count": 10579,
					"total_loaded_count": 10579,
					"total_unloaded_count": 0
				}
			}
		}
	}
}
```

How to check the Elasticsearch node's RAM details

1 Answer