unexpected error while failing replica – How to solve related issues

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unexpected error while failing replica – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” unexpected error while failing replica ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: replication.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log “{} unexpected error while failing replica” classname is TransportReplicationAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            } else {
                try {
                } catch (Throwable unexpected) {
                    logger.error("{} unexpected error while failing replica"; unexpected; request.shardId().id());
                } finally {


Run the Check-Up to get a customized report like this:

Analyze your cluster