Failed to clean up old shard generation 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 shard generation blobs, which are essentially data fragments. This could be due to insufficient permissions, disk space issues, or network connectivity problems. To resolve this, you can try increasing disk space, checking and adjusting the permissions for the OpenSearch process, or ensuring stable network connectivity. Additionally, consider checking the health of your nodes and shards, and if necessary, perform a manual cleanup of old shard generation blobs.

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

Log Context

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

        try {
            deleteFromContainer(blobContainer(); toDelete);
        } catch (Exception e) {
            logger.warn("Failed to clean up old shard generation blobs"; e);

    public SnapshotInfo getSnapshotInfo(final SnapshotId snapshotId) {


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