I'm sorry to inform you that 2.1.212 has an issue related to LOB removal, probably a race condition.

After upgrading from 2.1.210 I'm experiencing a freeze during DB close right after adding more than 1000 LOBs (approx. few hundred bytes to few KB each) in a single transaction (embedded mode, single connection). It's hard to tell where the freeze happens, it seems asynchronous wrt currently running code in SessionLocal.close(): if I put less LOBs then it happens AFTER returning from Database.removeSession(); if I put more LOBs then it happens in a well-above 1000th call to LobStorageMap.doRemoveLob(), in line 'streamStoreId = tempLobMap.remove(lobId)' - the control enters MVMap.remove() but never returns.

I'm able to reproduce the issue on a large DB consisting of millions of LOBs. On an empty DB there is no repro, so I don't think I'll be able to provide you with a standalone testcase.

Regards,
wburzyns