Fetching nodes from external cluster failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

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Briefly, this error occurs when Elasticsearch is unable to retrieve nodes from an external cluster. This could be due to network issues, incorrect configuration, or the external cluster being unavailable. To resolve this, ensure that the network connection is stable and the external cluster is up and running. Also, check the configuration settings for any errors. If the issue persists, consider restarting the Elasticsearch service or the entire cluster.

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This guide will help you check for common problems that cause the log ” fetching nodes from external cluster [{}] failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “fetching nodes from external cluster [{}] failed” classname is SniffConnectionStrategy.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        collectRemoteNodes(seedNodesSuppliers; listener);
                logger.warn(new ParameterizedMessage("fetching nodes from external cluster [{}] failed"; clusterAlias); e);

            final DiscoveryNode seedNode = seedNodesSuppliers.next().get();
            logger.trace("[{}] opening transient connection to seed node: [{}]"; clusterAlias; seedNode);


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