How To Solve Issues Related to Log – Masterleft ; reason

How To Solve Issues Related to Log – Masterleft ; reason

Updated: Jan-20

Elasticsearch Version: 1.7-8.0

Background

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To troubleshoot log “Masterleft ; reason” it’s important to understand a few problems related to Elasticsearch concepts discovery. See bellow important tips and explanations on these concepts

Log Context

Log”Master_left [{}]; reason [{}]” classname is ZenDiscovery.java
We extracted the following from Elasticsearch source code for those seeking 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(() -> new ParameterizedMessage("master_left [{}]; reason [{}]"; masterNode; reason); cause);

        synchronized (stateMutex) {
            if (localNodeMaster() == false && masterNode.equals(committedState.get().nodes().getMasterNode())) {
                // flush any pending cluster states from old master; so it will not be set as master again
                pendingStatesQueue.failAllStatesAndClear(new ElasticsearchException("master left [{}]"; reason));




Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Node Disconnects Every Hour  

Masters Leave For No Apparent Reaso  

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