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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to retrieve data from an external cluster. This could be due to network issues, incorrect cluster settings, or the external cluster being down. To resolve this, you can check the network connectivity between the clusters, verify the cluster settings, or ensure the external cluster is operational. Additionally, check the logs for more detailed error messages that can provide further insights into the problem.

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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 OpenSearch concepts: cluster.

Log Context

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

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

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


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