Another issue: This breaks because liblmdb does not
change the node size when overwriting an overflow page:
mdb_put(txn, dbi, &key, &(MDB_val){9000, val}, 0);
mdb_put(txn, dbi, &key, &(MDB_val){1, val}, 0);
mdb_get(txn, dbi, &key, &data);
assert(data.mv_size != 9000);
Fixed by 0cdd9dffddf66c730a35f48db2bb02d8bb3e5731.
mdb_cursor_put() said:
/* yes, overwrite it. Note in this case we don't
* bother to try shrinking the node if the new data
* is smaller than the overflow threshold.
*/
It's number of pages which does not need to shrink.
--
Hallvard
