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

Opster Team

Aug-23, Version: 7.5-7.13

Briefly, this error occurs when Elasticsearch is unable to load the snapshot repository data due to issues like incorrect repository configuration, network connectivity problems, or data corruption. To resolve this, you can try the following: 1) Verify the repository configuration and ensure it’s correct. 2) Check the network connectivity between Elasticsearch and the repository. 3) If the data is corrupted, consider creating a new snapshot repository. 4) Ensure that the Elasticsearch cluster has the necessary permissions to access the repository.

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 Elasticsearch concepts: repositories, blobstore, repository.

Log Context

Log “Failed to load repository data generation [” classname is
We extracted the following from Elasticsearch 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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