Could not read repository data from index blob – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to read the repository data from the index blob. This could be due to issues with the blob storage, such as connectivity problems, permissions issues, or corruption of the data. To resolve this, you could try re-establishing the connection to the blob storage, checking and correcting the permissions, or restoring the data from a backup. If the issue persists, you may need to recreate the repository or reindex the data.

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This guide will help you check for common problems that cause the log ” could not read repository data from index blob ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, repositories, blobstore, repository.

Log Context

Log “could not read repository data from index blob” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 // operations must start from the EMPTY_REPO_GEN again
 if (latestKnownRepoGen.compareAndSet(indexGen; RepositoryData.EMPTY_REPO_GEN)) {
 logger.warn("Resetting repository generation tracker because we failed to read generation [" + indexGen + "]"; ioe);
 throw new RepositoryException(; "could not read repository data from index blob"; ioe);
 }  private static String testBlobPrefix(String seed) {
 return TESTS_FILE + seed;


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