Is this the exact information for _nodes/stats response

Elastic Stack Elasticsearch
1

I had deployed eck-1.3.0 and elasticsearch 7.9.0 in GKE with 2 data-ingest and 3 master pods. Below is the one when I do get pods:

kubectl -n <ns>  get po

NAME                                              READY   STATUS              RESTARTS   AGE
elastic-operator-0                                1/1     Running             0          36m
elasticsearch-config-es-data-ingest-0             1/1     Running             0          33m
elasticsearch-config-es-data-ingest-1             1/1     Running             0          33m
elasticsearch-config-es-master-0                  1/1     Running             0          33m
elasticsearch-config-es-master-1                  1/1     Running             0          33m
elasticsearch-config-es-master-2                  1/1     Running             0          33m

Below is the response when I checked the elasticsearch nodes status


[root@elasticsearch-config-es-data-ingest-0 elasticsearch]# curl -u "es-admin:es-admin" -k -X GET "https://elasticsearch-config-es-http:9200/_nodes/stats?pretty"
{
  "_nodes" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "cluster_name" : "elasticsearch-config"

I forcibly down one of the elasticsearch node down, so that total nodes would be 5, active nodes should be 4 and failed nodes should be 1.

 kubectl -n <ns>  get po
NAME                                              READY   STATUS         RESTARTS   AGE
elastic-operator-0                                1/1     Running        0          58m
elasticsearch-config-es-data-ingest-0             1/1     Running        0          55m
elasticsearch-config-es-data-ingest-1             0/1     ErrImagePull   0          55m
elasticsearch-config-es-master-0                  1/1     Running        0          55m
elasticsearch-config-es-master-1                  1/1     Running        0          55m
elasticsearch-config-es-master-2                  1/1     Running        0          55m

But I can see the status as below inside the pod:

curl -u "un:pwd" -k -X GET "https://elasticsearch-config-es-http:9200/_nodes/stats?pretty"
{
  "_nodes" : {
    "total" : 4,
    "successful" : 4,
    "failed" : 0
  },
  "cluster_name" : "elasticsearch-config"

Is this the exact behaviour?

2

Yes, the API shows the number of active nodes. It doesn't track nodes that have left.

3

Thanks @warkolm . But in which case, failed must be updated in elasticsearch cluster.
I mean for the below command:
curl -u "un:pwd" -k -X GET "https://elasticsearch-config-es-http:9200/_nodes/stats?pretty"

4

The failed field counts the number of nodes that were in the cluster but which failed to respond to this specific _nodes/stats request. It doesn't include any nodes that aren't in the cluster any more.

5

Okay. Is there any way to test that failed field count scenario.

6

What do you mean "test"? You should be able to trust Elasticsearch to get this right.

7

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