Failed to clean up old index blobs – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to delete old index blobs, which are essentially data files. This could be due to insufficient permissions, disk space issues, or a problem with the blob deletion process. To resolve this, you can try the following: 1) Check and adjust the permissions of the blob storage, ensuring OpenSearch has the necessary rights to delete files. 2) Free up disk space if it’s running low. 3) Restart the OpenSearch service to reset the blob deletion process. Always ensure to backup your data before performing these operations.

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This guide will help you check for common problems that cause the log ” Failed to clean up old index blobs {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repositories, index, blobstore.

Log Context

Log “Failed to clean up old index blobs {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                                .mapToObj(gen -> INDEX_FILE_PREFIX + gen)
                            try {
                                deleteFromContainer(blobContainer(); oldIndexN);
                            } catch (IOException e) {
                                logger.warn(() -> new ParameterizedMessage("Failed to clean up old index blobs {}"; oldIndexN); e);
                            return newRepositoryData;


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