Failed to send back failure on join request – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when a node in the OpenSearch cluster fails to send a response to a join request. This could be due to network issues, high load on the node, or a software bug. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Monitor the load on the node and scale up resources if necessary. 3) Update or patch the OpenSearch software to the latest version to fix any potential bugs. 4) Check the OpenSearch logs for more detailed error messages that can help identify the problem.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” failed to send back failure on join request ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: join, cluster, request.

Log Context

Log “failed to send back failure on join request” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            public void onFailure(Exception e) {
                try {
                } catch (Exception inner) {
                    logger.warn("failed to send back failure on join request"; inner);

            public String toString() {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch