Log Master left ; reason – How To Solve Related Issues



Log Master left ; reason – How To Solve Related Issues

Opster Team

Dec-19, Version: 1.7-8.0

 

Before you read this guide, we recommend you run the Elasticsearch Error Check-Up which detects issues in ES that cause log errors. It’s a free tool that requires no installation and takes 2 minutes to complete.

This guide will help you check for common problems that cause the log ” Master left ; reason ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: discovery-azure-classic.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them. Among the dozens of checks included are: shards sizes, thread pools, management queue size, search errors, circuit breakers and many more (join over 700 users who use this free tool).

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 Discovery Zen Masters Alicia Master

2 User Authentication And Xpack Probl






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