Cluster UUID – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch cannot identify the unique identifier (UUID) of the cluster. This could be due to issues with the cluster state, network connectivity problems, or misconfigurations. To resolve this, you can try restarting the OpenSearch nodes, checking the network connectivity between nodes, or verifying the cluster settings in the OpenSearch configuration file. If the issue persists, consider reconfiguring the cluster or restoring from a backup.

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

Log Context

Log “cluster UUID [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            coordinationState.set(new CoordinationState(getLocalNode(); persistedState; electionStrategy));
            final ClusterState lastAcceptedState = coordinationState.get().getLastAcceptedState();
            if (lastAcceptedState.metadata().clusterUUIDCommitted()) {
      "cluster UUID [{}]"; lastAcceptedState.metadata().clusterUUID());
            final VotingConfiguration votingConfiguration = lastAcceptedState.getLastCommittedConfiguration();
            if (singleNodeDiscovery
                && votingConfiguration.isEmpty() == false
                && votingConfiguration.hasQuorum(Collections.singleton(getLocalNode().getId())) == false) {


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