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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an unexpected issue while preparing a shard for peer recovery, causing the recovery process to fail. This could be due to issues like disk space shortage, network connectivity problems, or corrupted data. To resolve this, you can try freeing up disk space, checking network connections, or repairing the corrupted data. Additionally, you can also try restarting the OpenSearch node or re-indexing the data. If the problem persists, consider increasing the logging level to DEBUG to get more detailed information about the error.

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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 OpenSearch 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 OpenSearch source code for those seeking an in-depth context :

                    requestToSend = startRequest;
                    actionName = PeerRecoverySourceService.Actions.START_RECOVERY;
                } catch (final Exception e) {
                    // this will be logged as warning later on...
                    logger.trace("unexpected error while preparing shard for peer recovery; failing recovery"; e);
                        new RecoveryFailedException(recoveryTarget.state(); "failed to prepare shard for recovery"; e);


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