May bee my changes with get max_allowed_packet when connect help for fix it?
Soume code as this in connection.py connect()
self.max_allowed_packet = min(16kb, get_server_variable('max_allowed_packet')

Only used to limit size of "LOAD LOCAL INFILE" data packet smaller than default (16KB).

@WorldException No. "Using packet as large as possible" is not good solution.

max_allowed_packet may be very large (say 100MB or 1GB).
Too large packet decrease performance and increase memory usage unnecessary.

16KB is small enough for memory and disk readahead, and large enough to avoid
too small TCP packet.