How To Solve Issues Related to Log – Fetching nodes from external cluster failed

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Related Issues – selected resources on related issues  
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Troubleshooting background

To troubleshoot Elasticsearch log “Fetching nodes from external cluster failed” it’s important to know common problems related to Elasticsearch concepts: cluster. See below-detailed explanations complete with common problems, examples and useful tips.

Cluster in Elasticsearch

What is it

In Elasticsearch a cluster is a collection of one or more nodes (servers / VMs). A cluster can consist of an unlimited number of nodes. The cluster provides interface for indexing and storing data and search capability across all of the data which is stored in the data nodes

Each cluster has a single master node that is elected by the master eligible nodes. In cases where the master is not available the other connected master eligible nodes elect a new master. Clusters are identified by a unique name, which defaults to “Elasticsearch”.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

Search Guard connect to remote Elasticsearch cluster using SSL
stackoverflow.com/questions/55413997/search-guard-connect-to-remote-elasticsearch-cluster-using-ssl

Number of Views : 0.09 K  Score on Stackoverflow :

Can A Local Elasticsearch Connect T
discuss.elastic.co/t/can-a-local-elasticsearch-connect-to-a-remote-elasticsearch-with-remote-cluster-feature/170591

 


Log Context

Log ”Fetching nodes from external cluster failed” classname is RemoteClusterConnection.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                     }
                    listener.onResponse(null);
                } catch (CancellableThreads.ExecutionCancelledException ex) {
                    listener.onFailure(ex); // we got canceled - fail the listener and step out
                } catch (Exception ex) {
                    logger.warn(() -> new ParameterizedMessage("fetching nodes from external cluster {} failed"; clusterAlias); ex);
                    collectRemoteNodes(seedNodes; transportService; connectionManager; listener);
                }
            }

            
Override





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