How To Solve Issues Related to Log – Master-left ; reason ES Log v2.3

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Troubleshooting Background – start here to get the full picture       
Related Issues – selected resources on related issues  
Log Context – usefull for experts
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Troubleshooting background

To troubleshoot Elasticsearch log “Master-left ; reason ES Log v2.3” it’s important to know common problems related to Elasticsearch concepts: discovery. See below-detailed explanations complete with common problems, examples and useful tips.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

Masters Leave For No Apparent Reaso
discuss.elastic.co/t/masters-leave-for-no-apparent-reason/141505

 

Data Node Left The Cluster Due To M
discuss.elastic.co/t/data-node-left-the-cluster-due-to-master-left-failed-to-ping-tried-3-times-each-with-maximum-30s-timeout/162618

 


Log Context

Log ”Master-left ; reason ES Log v2.3″ classname is ZenDiscovery.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

         if (localNodeMaster()) {
            // we might get this on both a master telling us shutting down; and then the disconnect failure
            return;
        }

        logger.info("master_left [{}]; reason [{}]"; masterNode; reason);

        clusterService.submitStateUpdateTask("zen-disco-master_failed (" + masterNode + ")"; new ClusterStateUpdateTask(Priority.IMMEDIATE) {
            
Override
            public boolean runOnlyOnMaster() {
                return false;





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