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

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when a node in the Elasticsearch cluster fails to respond to a rejoin request. This could be due to network issues, high load on the node, or a node failure. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Monitor the load on the nodes and scale up if necessary. 3) Restart the failed node or replace it if it’s consistently causing issues. 4) Check the cluster health and reconfigure the cluster if needed.

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 Elasticsearch concepts: request, cluster, response, discovery.

Log Context

Log “failed to send response on rejoin cluster request handling” classname is
We extracted the following from Elasticsearch 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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