Cluster state update after failed shard clone failed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when the OpenSearch cluster fails to update its state after an unsuccessful attempt to clone a shard. This could be due to network issues, insufficient resources, or a problem with the underlying storage system. To resolve this issue, you can try the following: 1) Check and improve your network connectivity, 2) Ensure that your system has enough resources (CPU, memory, disk space), 3) Check the health of your storage system and fix any issues, and 4) Retry the shard cloning operation after addressing these potential problems.

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This guide will help you check for common problems that cause the log ” Cluster state update after failed shard clone [{}] failed ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster, shard.

Log Context

Log “Cluster state update after failed shard clone [{}] failed” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    v -> logger.trace("Marked [{}] as failed clone from [{}] to [{}]"; repoShardId; sourceSnapshot; target.getSnapshotId());
                    ex -> {
                        logger.warn("Cluster state update after failed shard clone [{}] failed"; repoShardId);
                () -> currentlyCloning.remove(repoShardId)


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