Error while scheduling next sniffer task – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 5-5

Briefly, this error occurs when Elasticsearch’s client-side feature, the Sniffer, encounters an issue while scheduling its next task. The Sniffer is used to periodically fetch the cluster state and update the client’s internal cluster nodes list. This error could be due to network issues, node failures, or configuration problems. To resolve this, you can check the network connectivity, ensure all nodes are running properly, and verify the Sniffer’s configuration. If the issue persists, consider disabling the Sniffer if it’s not essential for your use case.

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

Log Context

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

                    logger.debug("scheduling next sniff in " + delayMillis + " ms");
                    this.scheduledFuture = this.scheduledExecutorService.schedule(this; delayMillis; TimeUnit.MILLISECONDS);
                } catch(Exception e) {
                    logger.error("error while scheduling next sniffer task"; e);



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