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(ITS#8813) MDB_VL32 causes MDB_TXN_FULL

Full_Name: Markus Junginger
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

We have a 1GB LMDB file with 7M K/V entries. With MDB_VL32, we always get a
MDB_TXN_FULL error for a transaction that is removing 2M entries (probably fails
at a lower count, we haven't measured that). Without MDB_VL32 it works fine.

Another observation:
Once the transaction fails with MDB_TXN_FULL, the data file has grown to 1.5GB.
Without MDB_VL32, the data file stays consistent at 1 GB even if all 7M entries
are deleted in a single transaction.

Expected behavior:
No MDB_TXN_FULL error, no data file growth.