def get_hosts(self, path, start, length):
_complain_ifclosed(self.closed)<EOL>return self.fs.get_hosts(path, start, length)<EOL>
Get hostnames where a particular block (determined by pos and
blocksize) of a file is stored. Due to replication, a single block
could be present on multiple hosts.

:type path: str
:param path: the path of the file
:type start: int
:param start: the start of the block
:type length: int
:param length: the length of the block
:rtype: list
:return: list of hosts that store the block