Not enough master nodes discovered during pinging found but needed pinging again – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch cannot find the required number of master nodes during the pinging process. This could be due to network issues, configuration errors, or the master nodes being down. To resolve this, ensure that all master nodes are up and running, check your network connectivity, and verify your OpenSearch configuration settings. Also, consider increasing the discovery.zen.ping_timeout value if your network is slow or unstable.

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This guide will help you check for common problems that cause the log ” not enough master nodes discovered during pinging (found [{}]; but needed [{}]); pinging again ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: master, discovery.

Log Context

Log “not enough master nodes discovered during pinging (found [{}]; but needed [{}]); pinging again” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                final ElectMasterService.MasterCandidate winner = electMaster.electMaster(masterCandidates);
                logger.trace("candidate {} won election"; winner);
                return winner.getNode();
            } else {
                // if we don't have enough master nodes; we bail; because there are not enough master to elect from
                logger.warn("not enough master nodes discovered during pinging (found [{}]; but needed [{}]); pinging again";
                            masterCandidates; electMaster.minimumMasterNodes());
                return null;
        } else {
            assert !activeMasters.contains(localNode) :


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