Failed to send join request on disconnection from master – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.3-1.3

Briefly, this error occurs when a node in an Elasticsearch cluster fails to send a join request after it gets disconnected from the master node. This could be due to network issues, heavy load on the master node, or configuration problems. To resolve this, you can check the network connectivity between nodes, ensure the master node is not overloaded, and verify the cluster settings. Also, consider increasing the ‘discovery.zen.join_timeout’ value to give nodes more time to join the cluster.

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

Log Context

Log “failed to send join request on disconnection from master [{}]” classname is ZenDiscovery.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             // got disconnected from the master; send a join request
            DiscoveryNode masterNode = latestDiscoNodes.masterNode();
            try {
                membership.sendJoinRequest(masterNode; localNode);
            } catch (Exception e) {
                logger.warn("failed to send join request on disconnection from master [{}]"; masterNode);
            }
        }
    }

    static class RejoinClusterRequest extends TransportRequest {




 

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