Failed to send join request to master reason – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when a node in the OpenSearch cluster fails to join the cluster because it cannot communicate with the master node. This could be due to network issues, incorrect configuration, or the master node being overloaded. To resolve this, you can check the network connectivity between the nodes, verify the cluster settings in the OpenSearch configuration file, or check the master node’s load and performance. If the master node is overloaded, consider adding more nodes to the cluster or upgrading the hardware of the existing nodes.

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This guide will help you check for common problems that cause the log ” failed to send join request to master [{}]; reason [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: master, join, request, discovery.

Log Context

Log “failed to send join request to master [{}]; reason [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                } else {
                    if (logger.isTraceEnabled()) {
                        logger.trace(() -> new ParameterizedMessage("failed to send join request to master [{}]"; masterNode); e);
                    } else {
              "failed to send join request to master [{}]; reason [{}]"; masterNode;
                    return false;


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