Failed to send rejoin request to – 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 an OpenSearch cluster fails to send a rejoin request to other nodes. This could be due to network issues, high load on the node, or configuration problems. To resolve this, you can check the network connectivity between nodes, ensure the node is not overloaded, and verify the cluster settings. If the problem persists, consider restarting the node or the entire cluster, but be aware this may cause temporary service disruption.

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

Log Context

Log “failed to send rejoin request to [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    new RejoinClusterRequest(localClusterState.nodes().getLocalNodeId());
                    new EmptyTransportResponseHandler(ThreadPool.Names.SAME) {

                        public void handleException(TransportException exp) {
                            logger.warn(() -> new ParameterizedMessage("failed to send rejoin request to [{}]"; otherMaster); exp);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("failed to send rejoin request to [{}]"; otherMaster); e);


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