Hi again Nick,
DBInputFormat does use Connection.TRANSACTION_SERIALIZABLE, but this a per
connection attribute. Since every mapper has its own connection, and every
connection is opened in a different time, every connection sees a different
snapshot of the DB and it can cause for example two mapper that process the
same record (if an insert command was performed).

On Wed, Sep 12, 2012 at 12:35 AM, Nick Jones <[EMAIL PROTECTED]> wrote: