add response for DFS command
add chunk info
change download code
the server readline and write to socket as byte array
add localFileName
dfs
Merge branch 'master' of github.com:Eagles2F/MapReduceAndDFS

Conflicts:
	MapReduceAndDFS/src/utility/DFSMessage.java
add two datanode manage classes
delete the chunkNum in the dataNode download file
add locaPath
a
add sourcePath
Merge branch 'master' of github.com:Eagles2F/MapReduceAndDFS

Conflicts:
	MapReduceAndDFS/src/dfs/HandleDFSClientReq.java
Merge branch 'master' of github.com:Eagles2F/MapReduceAndDFS
aa
change source to target
change DFSdir
asdf
download server
Merge branch 'master' of github.com:Eagles2F/MapReduceAndDFS
integrate dfs into mapreduce framework.
Partitioner output will store in dfs and the worker node will download
every partition before do reduce task