Cluster-manager node failed restarting discovery – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.1-2.9

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Briefly, this error occurs when the cluster manager node in OpenSearch fails, causing the discovery process to restart. This could be due to network issues, hardware failure, or configuration errors. To resolve this, you can check the network connectivity between nodes, ensure the hardware is functioning properly, and verify the configuration settings. Additionally, check the OpenSearch logs for more detailed error messages that can provide further insight into the problem. Regular monitoring and maintenance of the OpenSearch cluster can also help prevent such issues.

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

Log Context

Log “cluster-manager node [{}] failed; restarting discovery” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    private void onLeaderFailure(Exception e) {
        synchronized (mutex) {
            if (mode != Mode.CANDIDATE) {
                assert lastKnownLeader.isPresent();
       ParameterizedMessage("cluster-manager node [{}] failed; restarting discovery"; lastKnownLeader.get()); e);


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