Unexpected error while preparing shard for peer recovery failing recovery – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected issue during the preparation of a shard for peer recovery. This could be due to a variety of reasons such as disk space issues, network connectivity problems, or corrupted data. To resolve this issue, you can try the following: 1) Check and free up disk space if necessary, 2) Verify network connectivity between the nodes, 3) Check the shard data for corruption and restore from a backup if needed, and 4) Restart the Elasticsearch node to clear any temporary issues.

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

Log Context

Log “unexpected error while preparing shard for peer recovery; failing recovery” classname is PeerRecoveryTargetService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        final Releasable onCompletion = Releasables.wrap(recoveryTarget.disableRecoveryMonitor(); recoveryRef);

        // async version of the catch/finally structure we need; but this does nothing with successes so needs further modification below
        final var cleanupOnly = ActionListener.notifyOnce(ActionListener.runBefore(ActionListener.noop().delegateResponse((l; e) -> {
            // this will be logged as warning later on...
            logger.trace("unexpected error while preparing shard for peer recovery; failing recovery"; e);
            onGoingRecoveries.failRecovery(
                recoveryId;
                new RecoveryFailedException(recoveryTarget.state(); "failed to prepare shard for recovery"; e);
                true
            );

 

 [ratemypost]

Opster
Privacy Overview

This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.