Send message failed channel: – 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 ” Send message failed channel: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: handler.

Log Context

Log “Send message failed [channel: {}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             closeAndCallback(() -> listener.onResponse(v));

        protected void innerOnFailure(Exception e) {
            logger.warn(() -> new ParameterizedMessage("send message failed [channel: {}]"; channel); e);
            closeAndCallback(() -> listener.onFailure(e));

        private void closeAndCallback(Runnable runnable) {
            Releasables.close(optionalReleasable; runnable::run);


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