Seed node cluster name mismatch expected – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.3

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Briefly, this error occurs when there is a mismatch between the cluster names of the seed node and the node trying to join the cluster. This could be due to incorrect configuration settings. To resolve this issue, you can: 1) Check and correct the cluster name in the elasticsearch.yml configuration file of the node trying to join the cluster. 2) If you have multiple clusters, ensure that the node is pointing to the correct cluster. 3) Restart the Elasticsearch service after making the necessary changes.

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This guide will help you check for common problems that cause the log ” seed node {} cluster name mismatch expected ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node, cluster.

Log Context

Log “seed node {} cluster name mismatch expected ” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                            try {
                                ConnectionProfile connectionProfile = connectionManager.getConnectionProfile();
                                handshakeResponse = transportService.handshake(connection; connectionProfile.getHandshakeTimeout().millis();
                                    (c) -> remoteClusterName.get() == null ? true : c.equals(remoteClusterName.get()));
                            } catch (IllegalStateException ex) {
                                logger.warn(() -> new ParameterizedMessage("seed node {} cluster name mismatch expected " +
                                    "cluster name {}"; connection.getNode(); remoteClusterName.get()); ex);
                                throw ex;

                            final DiscoveryNode handshakeNode = maybeAddProxyAddress(proxyAddress; handshakeResponse.getDiscoveryNode());


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