How To Solve Issues Related to Log – Illegal state; should not have an empty cluster group when stopping; I should be there at teh very least…

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Troubleshooting background

To troubleshoot Elasticsearch log “Illegal state; should not have an empty cluster group when stopping; I should be there at teh very least…” it’s important to know common problems related to Elasticsearch concepts: cluster, discovery. See below-detailed explanations complete with common problems, examples and useful tips.

Cluster in Elasticsearch

What is it

In Elasticsearch a cluster is a collection of one or more nodes (servers / VMs). A cluster can consist of an unlimited number of nodes. The cluster provides interface for indexing and storing data and search capability across all of the data which is stored in the data nodes

Each cluster has a single master node that is elected by the master eligible nodes. In cases where the master is not available the other connected master eligible nodes elect a new master. Clusters are identified by a unique name, which defaults to “Elasticsearch”.


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 :

Elasticsearch cluster ‘master_not_discovered_exception’
stackoverflow.com/questions/37970187/elasticsearch-cluster-master-not-discovered-exception

Number of Views : 20.73 K  Score on Stackoverflow : 8

How to connect Kafka with Elasticsearch?
stackoverflow.com/questions/48561197/how-to-connect-kafka-with-elasticsearch/48593206

Number of Views : 14.19 K  Score on Stackoverflow : 7


Log Context

Log ”Illegal state; should not have an empty cluster group when stopping; I should be there at teh very least…” classname is LocalDiscovery.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

     
Override
    protected void doStop() {
        synchronized (clusterGroups) {
            ClusterGroup clusterGroup = clusterGroups.get(clusterName);
            if (clusterGroup == null) {
                logger.warn("Illegal state; should not have an empty cluster group when stopping; I should be there at teh very least...");
                return;
            }
            clusterGroup.members().remove(this);
            if (clusterGroup.members().isEmpty()) {
                // no more members; remove and return





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