Determined repository generation – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.5-7.11

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Briefly, this error occurs when Elasticsearch encounters an issue with the snapshot repository, specifically with the generation number. The generation number is a unique identifier for each snapshot. This error can be caused by a mismatch between the expected and actual generation number. To resolve this issue, you can try the following: 1) Verify the repository and its settings, 2) Check the snapshot status and delete any corrupted or incomplete snapshots, 3) If the issue persists, consider creating a new repository and moving the snapshots there.

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

Log Context

Log “Determined repository generation [” classname is BlobStoreRepository.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        new RepositoryException(metadata.name(); "Could not determine repository generation from root blobs"; e));
                    return;
                }
                genToLoad = latestKnownRepoGen.updateAndGet(known -> Math.max(known; generation));
                if (genToLoad > generation) {
                    logger.info("Determined repository generation [" + generation
                        + "] from repository contents but correct generation must be at least [" + genToLoad + "]");
                }
            } else {
                // We only rely on the generation tracked in #latestKnownRepoGen which is exclusively updated from the cluster state
                genToLoad = latestKnownRepoGen.get();

 

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