Exception during cleanup of root level 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 encounters an issue while trying to clean up root level blobs, which are data objects in the system. This could be due to a variety of reasons such as insufficient permissions, disk space issues, or network connectivity problems. To resolve this issue, you could try checking and adjusting the permissions, ensuring there’s enough disk space, or troubleshooting the network connection. Additionally, you could also check the OpenSearch logs for more detailed information about the error, which could help in identifying the root cause and fixing it.

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This guide will help you check for common problems that cause the log ” [{}] Exception during cleanup of root level blobs ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: repositories, blobstore.

Log Context

Log “[{}] Exception during cleanup of root level blobs” classname is BlobStoreRepository.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        } catch (Exception e) {
            // TODO: We shouldn't be blanket catching and suppressing all exceptions here and instead handle them safely upstream.
            // Currently this catch exists as a stop gap solution to tackle unexpected runtime exceptions from implementations
            // bubbling up and breaking the snapshot functionality.
            assert false : e;
            logger.warn(new ParameterizedMessage("[{}] Exception during cleanup of root level blobs"; metadata.name()); e);
        return Collections.emptyList();

    private void cleanupStaleIndices(


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