Failed to send response on rejoin cluster request handling – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when a node in the OpenSearch cluster fails to send a response during a rejoin cluster 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) Restart the node or the entire cluster if the problem persists.

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

Log Context

Log “failed to send response on rejoin cluster request handling” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        public void messageReceived(final RejoinClusterRequest request; final TransportChannel channel; Task task) throws Exception {
            try {
            } catch (Exception e) {
                logger.warn("failed to send response on rejoin cluster request handling"; e);
            synchronized (stateMutex) {
                rejoin("received a request to rejoin the cluster from [" + request.fromNodeId + "]");


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