Failed to delete some blobs during snapshot delete – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1.2-2.1

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Briefly, this error occurs when OpenSearch fails to delete some blobs (data blocks) during the process of deleting a snapshot. This could be due to insufficient permissions, network issues, or a problem with the underlying storage system. To resolve this issue, you can try the following: 1) Check and adjust the permissions for the OpenSearch process to ensure it has the necessary rights to delete blobs. 2) Investigate network connectivity to the storage system. 3) Check the health and configuration of the storage system. 4) Retry the snapshot deletion after resolving any identified issues.

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

Log Context

Log “{} Failed to delete some blobs during snapshot delete” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(ActionRunnable.wrap(listener; l -> {
            try {
                deleteFromContainer(blobContainer(); filesToDelete);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("{} Failed to delete some blobs during snapshot delete"; snapshotIds); e);
                throw e;


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