Failed to send join request to master reason tried times – 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 an 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, ensure that all nodes have the correct network configuration and can reach each other. Check the master node’s load and consider adding more resources or nodes to the cluster if it’s overloaded. Also, verify that the cluster’s settings are correct, especially the discovery and cluster initial master nodes settings.

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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 [{}]; tried [{}] times ” 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 [{}]; tried [{}] times” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                return true;
            } catch (Exception e) {
                final Throwable unwrap = ExceptionsHelper.unwrapCause(e);
                if (unwrap instanceof NotMasterException) {
                    if (++joinAttempt == this.joinRetryAttempts) {
              "failed to send join request to master [{}]; reason [{}]; tried [{}] times"; masterNode;
                            ExceptionsHelper.detailedMessage(e); joinAttempt);
                        return false;
                    } else {
                        logger.trace("master {} failed with [{}]. retrying... (attempts done: [{}])"; masterNode;
                            ExceptionsHelper.detailedMessage(e); joinAttempt);


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