Unexpected error during recovery ; failing shard – 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 can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Unexpected error during recovery ; failing shard ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, recovery and shard.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Unexpected error during recovery [{}]; failing shard” classname is PeerRecoveryTargetService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 
        
Override
        public void onFailure(Exception e) {
            try (RecoveryRef recoveryRef = onGoingRecoveries.getRecovery(recoveryId)) {
                if (recoveryRef != null) {
                    logger.error(() -> new ParameterizedMessage("unexpected error during recovery [{}]; failing shard"; recoveryId); e);
                    onGoingRecoveries.failRecovery(recoveryId;
                            new RecoveryFailedException(recoveryRef.target().state(); "unexpected error"; e);
                            true // be safe
                    );
                } else {



 

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