[Debug]FailureDetector log (no replies)

my fabric version is 1.5.3, I find some debug log in /var/log/fabric.log
seems like:

[DEBUG] 1439186427.280332 - FailureDetector(work1) - Statement (SELECT server_uuid, server_address, mode, status, weight, group_id FROM servers WHERE group_id = %s, Params((u'work1',)).
[DEBUG] 1439186429.285402 - FailureDetector(work1) - Statement (SELECT group_id, description, master_uuid, master_defined, status FROM groups WHERE group_id = %s, Params((u'work1',)).

the fabric.log is very huge(3GB 5months).

But i compare master/slave by use mysqldbcompare, it say "# Databases are consistent." and slave status still be ok.

should i ignore this debug information ?