Failed to load repository data generation – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch is unable to load data from a snapshot repository due to issues like network connectivity, incorrect repository configuration, or insufficient permissions. To resolve this, you can check the network connection between OpenSearch and the repository. Ensure the repository is correctly configured and accessible. Also, verify that OpenSearch has the necessary permissions to access the repository. If the repository data is corrupted, you may need to restore it from a backup.

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This guide will help you check for common problems that cause the log ” Failed to load repository data generation [ ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repositories, blobstore, repository.

Log Context

Log “Failed to load repository data generation [” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            } catch (RepositoryException e) {
                // If the generation to load changed concurrently and we didn't just try loading the same generation before we retry
                if (genToLoad != latestKnownRepoGen.get() && genToLoad != lastFailedGeneration) {
                    lastFailedGeneration = genToLoad;
                    logger.warn("Failed to load repository data generation [" + genToLoad +
                        "] because a concurrent operation moved the current generation to [" + latestKnownRepoGen.get() + "]"; e);
                if (bestEffortConsistency == false && ExceptionsHelper.unwrap(e; NoSuchFileException.class) != null) {
                    // We did not find the expected index-N even though the cluster state continues to point at the missing value


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