Description of problem:
AFR volume: create a AFR volume, and then change a file in one brick (just add a row, so it is a wrong file).I delete this wrong file in this brick, and then execute "gluster volume heal afr_full". Guess what? yes,it recover a file in this brick, but ... this file is a wrong file(changed by me),not a copy from carbon node. why ? 

Version-Release number of selected component (if applicable):
3.4.1 & 3.3.2

How reproducible:
always and I have test many times

Steps to Reproduce:
1.create a AFR volume : afr_vol
2.change a file in one brick (just add a row)
3.gluster volume heal afr_vol full
4.recover a file (changed by me,not a copy from carbon node)

Actual results:
this file is the file which changed by me

Expected results:
recover a normal file (copy from other node)

Additional info:
so why?