Determined repository generation – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch is trying to create a snapshot or restore from a snapshot in a repository, but there’s a mismatch in the repository generation. This could be due to concurrent modifications or issues with the underlying storage system. To resolve this, you can try the following: 1) Ensure no concurrent snapshot operations are running. 2) Check the health and connectivity of your storage system. 3) Try to manually increase the repository generation. 4) If the issue persists, consider creating a new repository and migrating your data.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

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 OpenSearch concepts: repositories, blobstore, repository.

Log Context

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

                        new RepositoryException(; "Could not determine repository generation from root blobs"; ioe));
                genToLoad = latestKnownRepoGen.updateAndGet(known -> Math.max(known; generation));
                if (genToLoad > generation) {
          "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();


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch