Full_Name: Timur Kristóf Version: LMDB latest master OS: Fedora 20 URL: Submission from: (NULL) (94.248.245.60)

Hi,

I'm the author of the Node.js LMDB binding and I've found an interesting issue that might be useful to share with other people who develop bindings or applications on LMDB.

When you operate on a dbi using a cursor and accidentally close the dbi before committing the transaction of the cursor, mdb_txn_commit will return MDB_BAD_VALSIZE. This is quite misleading because the problem doesn't actually have anything to do with what the error message suggests. ("Too big key/data, key is empty, or wrong DUPFIXED size")

I suggest to either add a new kind of error code for this situation or to extend the description of MDB_BAD_VALSIZE.

Here's a small test case which will demonstrate it: http://pastebin.com/hHwD1srf

Best regards, Timur Kristóf