Fetching nodes from external cluster failed – Elasticsearch Log Diagnostic

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Log Context – usefull for experts
Related Issues – selected resources from the community  
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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”.

Log Context

Log ”Fetching nodes from external cluster failed” classname is RemoteClusterConnection.java
To help get the right context about this log, we have extracted the following from Elasticsearch source code

                } 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);


To help troubleshoot related issues we have gathered selected answers from STOF & Discuss and issues from Github, please review the following for further information :

Search Guard connect to remote Elasticsearch cluster using SSL

Number of Views : 0.09 K  Score on Stackoverflow :

Can A Local Elasticsearch Connect T


About Opster

Incorporating deep knowledge and broad history of Elasticsearch issues. Opster’s solution identifies and predicts root causes of Elasticsearch problems, provides recommendations and can automatically perform various actions to manage, troubleshoot and prevent issues

We are constantly updating our analysis of Elasticsearch logs, errors, and exceptions. Sharing best practices and providing troubleshooting guides.

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