Failed to write index latest blob If you do not intend to use this – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch fails to write the latest index blob, which is crucial for index recovery and replication. This could be due to insufficient disk space, permission issues, or network connectivity problems. To resolve this, ensure there’s enough disk space and correct permissions are set for the OpenSearch data directory. Also, check the network connectivity between nodes if you’re in a distributed environment. If the error persists, consider reindexing your data or restoring from a backup.

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This guide will help you check for common problems that cause the log ” Failed to write index.latest blob. If you do not intend to use this ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repositories, blobstore, index.

Log Context

Log “Failed to write index.latest blob. If you do not intend to use this” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        if (supportURLRepo) {
            logger.debug("Repository [{}] updating index.latest with generation [{}]";; newGen);
            try {
                writeAtomic(blobContainer(); INDEX_LATEST_BLOB; new BytesArray(Numbers.longToBytes(newGen)); false);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("Failed to write index.latest blob. If you do not intend to use this " +
                        "repository as the basis for a URL repository you may turn off attempting to write the index.latest blob by " +
                        "setting repository setting [{}] to [false]"; SUPPORT_URL_REPO.getKey()); e);


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