Non-failed nodes do not form a quorum – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-8.9

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Briefly, this error occurs when a majority of nodes in an Elasticsearch cluster are not available or cannot communicate with each other, preventing the cluster from reaching a consensus or “quorum”. This can be due to network issues, node failures, or misconfiguration. To resolve this, ensure all nodes are running and network connectivity is stable. Check the cluster settings and adjust the “discovery.zen.minimum_master_nodes” to a suitable value. Also, consider using dedicated master nodes to improve stability.

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This guide will help you check for common problems that cause the log ” non-failed nodes do not form a quorum ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “non-failed nodes do not form a quorum” class name is Publication.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 logger.debug(
 "onPossibleCommitFailure: non-failed nodes {} do not form a quorum; so {} cannot succeed";
 possiblySuccessfulNodes;
 this
 );
 Exception e = new FailedToCommitClusterStateException("non-failed nodes do not form a quorum");
 publicationTargets.stream().filter(PublicationTarget::isActive).forEach(pt -> pt.setFailed(e));
 onPossibleCompletion();
 }
 }

 

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