Exception while trying to clone shard – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.9-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to clone a shard, which is a subset of an index’s data. This could be due to insufficient disk space, network connectivity issues, or a problem with the source shard. To resolve this, you can try freeing up disk space, checking network connectivity, or repairing the source shard. If the problem persists, consider increasing the logging level 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 ” Exception [{}] while trying to clone shard [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: shard.

Log Context

Log “Exception [{}] while trying to clone shard [{}]” classname is SnapshotsService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                                    () -> currentlyCloning.remove(repoShardId)
                            e -> {
                                logger.warn("Exception [{}] while trying to clone shard [{}]"; e; repoShardId);
                                failCloneShardAndUpdateClusterState(target; sourceSnapshot; repoShardId);
                        if (currentlyCloning.add(repoShardId)) {
                            if (cloneRemoteStoreIndexShardSnapshot) {


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