Failed to notify listeners – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Failed to notify listeners ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: listeners and snapshots.

Log Context

Log “Failed to notify listeners” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             ActionListener.onFailure(completionListeners; failure);
                        } else {
                            ActionListener.onResponse(completionListeners; snapshotInfo);
                    } catch (Exception e) {
                        logger.warn("Failed to notify listeners"; e);
                if (listener != null) {


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