Failed to start snapshot clone – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to initiate a snapshot clone operation. This could be due to insufficient permissions, lack of storage space, or network connectivity issues. To resolve this, ensure that the user has the necessary permissions to perform the operation. Also, check if there’s enough storage space available for the snapshot clone. If the issue persists, verify the network connectivity between the OpenSearch cluster and the snapshot repository. Lastly, check the OpenSearch logs for more detailed error messages that could help identify the root cause.

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This guide will help you check for common problems that cause the log ” Failed to start snapshot clone [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: snapshot.

Log Context

Log “Failed to start snapshot clone [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        final Executor executor = threadPool.executor(ThreadPool.Names.SNAPSHOT);
        // Exception handler for IO exceptions with loading index and repo metadata
        final Consumer onFailure = e -> {
   -> new ParameterizedMessage("Failed to start snapshot clone [{}]"; cloneEntry); e);
            removeFailedSnapshotFromClusterState(targetSnapshot; e; null; null);

        // 1. step; load SnapshotInfo to make sure that source snapshot was successful for the indices we want to clone
        // TODO: we could skip this step for snapshots with state SUCCESS


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