Does the BlobDB still not support secondary instance? #13296
Description
In the RocksDB wiki (https://github.com/facebook/rocksdb/wiki/BlobDB), it is stated that BlobDB does not support secondary instances. However, the specific reason for this lack of support isn't clearly explained.
Based on my understanding, due to the multi-version design of RocksDB, the primary instance cannot perceive references to some data (such as SST files and keys) that might be actively used by the secondary instance during compaction operations. This can lead to situations where data referenced by the secondary instance is inadvertently released by the primary instance. Blob files, which are also referenced by SST files, might be subject to the same issue.
I would like to know if there are other limitations, aside from the ones mentioned above, that prevent BlobDB from supporting secondary instances.