Failed to send join request to master reason tried times – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

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Briefly, this error occurs when a node in Elasticsearch cluster fails to join the cluster because it can’t communicate with the master node. This could be due to network issues, incorrect configuration, or the master node being overwhelmed. To resolve this, ensure that all nodes have correct network configurations and can communicate with each other. Check the master node’s load and resources, and if necessary, scale it up or distribute the load. Also, verify the cluster’s health and settings, and adjust them if needed.

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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 Elasticsearch concepts: request, discovery, master, join.

Log Context

Log “failed to send join request to master [{}]; reason [{}]; tried [{}] times” classname is
We extracted the following from Elasticsearch 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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