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Briefly, this error occurs when OpenSearch cannot locate a readable index-N file in a non-empty shard snapshot directory. This could be due to file corruption, incorrect permissions, or a missing file. To resolve this, you can try restoring the missing or corrupted file from a backup, checking and correcting the file permissions, or recreating the index if the data is recoverable from another source. If the issue persists, consider reconfiguring your snapshot settings or consult with your system administrator for further assistance.
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This guide will help you check for common problems that cause the log ” Could not find a readable index-N file in a non-empty shard snapshot directory [” + shardContainer.path() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: blobstore, snapshot, repositories, shard, container.
Log Context
Log “Could not find a readable index-N file in a non-empty shard snapshot directory [” + shardContainer.path() + “]” classname is BlobStoreRepository.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
final BlobStoreIndexShardSnapshots shardSnapshots =
INDEX_SHARD_SNAPSHOTS_FORMAT.read(shardContainer; Long.toString(latest); namedXContentRegistry);
return new Tuple(shardSnapshots; latest);
} else if (blobs.stream().anyMatch(b -> b.startsWith(SNAPSHOT_PREFIX) || b.startsWith(INDEX_FILE_PREFIX)
|| b.startsWith(UPLOADED_DATA_BLOB_PREFIX))) {
logger.warn("Could not find a readable index-N file in a non-empty shard snapshot directory [" + shardContainer.path() + "]");
}
return new Tuple(BlobStoreIndexShardSnapshots.EMPTY; latest);
}
/**
