No longer master source source – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.2

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 Elasticsearch operation.

Briefly, this error occurs when the Elasticsearch node that was previously acting as the master is no longer in that role. This could be due to network issues, resource constraints, or configuration problems. To resolve this, you can check the cluster health and logs to identify any issues. Ensure that the master node is properly configured and has sufficient resources. If network issues are suspected, verify the connectivity between nodes. Also, consider increasing the ‘discovery.zen.minimum_master_nodes’ setting to prevent split-brain scenarios.

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 ” no longer master. source: [” + source + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: admin, master, cluster.

Log Context

Log “no longer master. source: [” + source + “]” class name is TransportClusterHealthAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 @Override
 public void onNoLongerMaster() {
 logger.trace("stopped being master while waiting for events with priority [{}]. retrying."; request.waitForEvents());
 // TransportMasterNodeAction implements the retry logic; which is triggered by passing a NotMasterException
 listener.onFailure(new NotMasterException("no longer master. source: [" + source + "]"));
 }  @Override
 public void onFailure(Exception e) {
 if (e instanceof ProcessClusterEventTimeoutException) {

 

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?