Election stopped source – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when OpenSearch cluster nodes fail to elect a master node due to network issues, configuration problems, or heavy load. To resolve this, ensure all nodes are properly configured and connected. Check the network for any issues that might prevent nodes from communicating. Also, monitor the cluster’s load and resources to prevent overloading. If necessary, consider adding more nodes to the cluster to distribute the load and prevent such issues.

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This guide will help you check for common problems that cause the log ” election stopped [” + source + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: source, discovery.

Log Context

Log “election stopped [” + source + “]” class name is NodeJoinController.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 public void clusterStateProcessed(String source; ClusterState oldState; ClusterState newState) {
 if (newState.nodes().isLocalNodeElectedMaster()) {
 } else {
 onFailure(source; new NotMasterException("election stopped [" + source + "]"));
 }  @Override
 public void onFailure(String source; Exception e) {


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