Error while sniffing nodes – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch client tries to discover nodes in the cluster but fails. This could be due to network issues, incorrect configuration, or the targeted nodes being down. To resolve this, ensure that the nodes are up and running, check your network connectivity, and verify your Elasticsearch configuration, particularly the settings related to node discovery and sniffing. If sniffing is not necessary, consider disabling it in the client’s configuration.

This guide will help you check for common problems that cause the log ” error while sniffing nodes ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client.

Log Context

Log “error while sniffing nodes” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            try {
            } catch (Exception e) {
                logger.error("error while sniffing nodes"; e);
            } finally {
                Task task = new Task(sniffIntervalMillis);
                Future> future = scheduler.schedule(task; nextTaskDelay);
                // tasks are run by a single threaded executor; so swapping is safe with a simple volatile variable
                ScheduledTask previousTask = nextScheduledTask;


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