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job.py
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job.py
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import socket
import struct
import cPickle as pickle
import marshal, types
from multiprocessing import Process
import time
from threading import Thread
import logging
import heapq
import sys, os
#----
import params
from mapreduce import MapOutBuffer
from util import TcpHelper as helper
from util import BlockReader
from dfsclient import DfsClient
import file_util
class Protocal:
def __init__(self):
self.id = 0
self.mapfn = None
self.reducefn = None
self.combinefn = None
self.reduce_num = 0
self.map_num = 0
self.dfsfile = None
self.mode = 0x02
def send_command(self, command, data=' '):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((params.TASK_SERVER_IP, params.TASK_SERVER_PORT))
msg = command + ':' + data
msg_len = struct.pack('!i', len(msg))
sock.sendall(msg_len + msg)
recv_len, = struct.unpack('!i',helper.receive_len(sock, 4))
recv_data = helper.receive_len(sock, recv_len)
pos = recv_data.find(':')
cmd = str(recv_data[: pos])
msg = recv_data[pos+1:]
sock.close()
return cmd, msg
def send_id_command(self, command, data=' '):
idB = struct.pack('!i', self.id)
return self.send_command(command, idB + data)
def _parse_task_info(self, data):
cur = 0
#map_num
self.map_num, = struct.unpack('!i', data[cur:cur+4])
cur += 4
#reduce num
self.reduce_num, = struct.unpack('!i', data[cur:cur+4])
cur += 4
#mapfn
map_len, = struct.unpack('!i', data[cur:cur+4])
cur += 4
code_string = data[cur: cur+map_len]
self.mapfn = types.FunctionType(marshal.loads(code_string), globals(), "mapfn")
cur += map_len
#reducefn
reduce_len, = struct.unpack('!i', data[cur:cur+4])
cur += 4
code_string = data[cur: cur+reduce_len]
self.reducefn = types.FunctionType(marshal.loads(code_string), globals(), "reducefn")
cur += reduce_len
#combinefn
isExsit, = struct.unpack('!b', data[cur:cur+1])
cur += 1
if isExsit==0x01:
combine_len, = struct.unpack('!i', data[cur:cur+4])
cur += 4
code_string = data[cur: cur+combine_len]
self.combinefn = types.FunctionType(marshal.loads(code_string), globals(), "combinefn")
cur += combine_len
#dfs file
self.mode, = struct.unpack('!b', data[cur:cur+1])
cur += 1
if self.mode == 0x01:
name_len, = struct.unpack('!i', data[cur:cur+4])
cur += 4
self.dfsfile = data[cur: cur+name_len]
def start_map_process(mapId, task_info):
mapper = Mapper(mapId, task_info)
mapper.start()
def start_reduce_process(reduceId, task_info):
reducer = Reducer(reduceId, task_info)
reducer.start()
class JobClient(Protocal):
START = 0
INFO = 1
HEART = 2
def __init__(self):
Protocal.__init__(self)
self.id = 0
self.task_info = None
self.file_server = file_util.FileServer(params.MAP_TMP_DIR)
self.file_server_port = self.file_server.get_port()
self.map_max = params.JOB_MAP_MAX
self.reduce_max = params.JOB_REDUCE_MAX
def sayhello(self):
info = struct.pack('!3i', self.map_max , self.reduce_max, self.file_server_port)
cmd, msg = self.send_command('job_start', info)
#id
self.id, = struct.unpack('!i', msg[0:4])
self.task_info = msg[4:]
self._parse_task_info(msg[4:])
def start(self):
print 'job client start...'
#say hello to task server
self.sayhello()
#start a file server waiting transfer map result file to reducer
logging.info('start file server')
t = Thread(target=self.file_server.start)
t.start()
#start timer to send heart beat
logging.info('job heart beat loop')
while True:
data = self.send_id_command('job_heart')
if self._heart_beat_callback(data):
break
time.sleep(3)
logging.info('job client %d exit' % self.id)
logging.info('job client %d exit' % self.id)
os._exit(0)
def delete_tmp_file(self):
if os.path.exists(self.tmp_dir):
file_util.rm_dir(self.tmp_dir)
#return whether to exit
def _heart_beat_callback(self, data):
cmd, msg = data
if cmd == 'job_map_assign':
#start new process
map_id, = struct.unpack('!i', msg)
logging.info('start map %d' % map_id)
#p = Thread(target=start_map_process, args=(map_id, self.task_info))
p = Process(target=start_map_process, args=(map_id, self.task_info))
p.start()
elif cmd == 'job_reduce_assign':
reduce_id, = struct.unpack('!i', msg)
logging.info('start reduce %d' % reduce_id)
p = Process(target=start_reduce_process, args=(reduce_id, self.task_info))
p.start()
elif cmd =='job_idle':
pass
elif cmd == 'job_exit':
self.file_server.close()
return True#exit
return False
class Mapper(Protocal):
def __init__(self, id, task_info):
Protocal.__init__(self)
self.id = id
self._parse_task_info(task_info)
self.outBuffer = MapOutBuffer(self.id, self.reduce_num, self.combinefn)
def sayhello(self):
cmd, res = self.send_id_command('map_start')
self.source = pickle.loads(res)
def _mem_mode_map(self):
res = self.mapfn(self.id, self.source)
for kv in res:
self.outBuffer.write(kv)
self.outBuffer.merge_all()
def _disk_mode_map(self):
fobj = DfsClient().open(self.dfsfile)
block = self.source
reader = BlockReader(block, fobj)
while True:
data = reader.read_line()
if data is None:
break
res = self.mapfn(self.id, data)
for kv in res:
self.outBuffer.write(kv)
self.outBuffer.merge_all()
def start(self):
print 'ready, map %d starting' % self.id
logging.info('ready, map %d starting' % self.id)
self.sayhello()
if self.mode == 0x01:
self._disk_mode_map()
else:
self._mem_mode_map()
print 'map %d work down' % self.id
logging.info('map %d work down' % self.id)
cmd, msg = self.send_id_command('map_down')
if msg =='map_exit':
logging.info('map %d exit' % self.id )
class Reducer(Protocal):
def __init__(self, id, taskInfo):
Protocal.__init__(self)
self.id = id
self._parse_task_info(taskInfo)
self.file_servers = None
self.dir = params.REDUCE_TMP_DIR
self.map_files= []
def sayhello(self):
cmd, res = self.send_id_command('reduce_start')
self.file_servers = pickle.loads(res)
#print self.file_servers
def start(self):
print 'ready, reduce %d starting' % self.id
logging.info('ready, reduce %d starting' % self.id)
self.sayhello()
logging.info('reduce %d start download map result file...' %self.id)
self.downLodeFile()
logging.info('reduce %d start merge' % self.id)
self.merge()
print 'reduce %d work down' % self.id
logging.info('reduce %d work down' % self.id)
cmd, msg = self.send_id_command('reduce_down')
if msg =='reduce_exit':
logging.info('reduce %d exit' % self.id )
def downLodeFile(self):
for item in self.file_servers:
ip, port, map_ids = item
for i in map_ids:
file_name = 'map%d_%d.seg' % (i, self.id)
self.map_files.append(file_name)
#print 'try to download %s' % file_name
file_util.FileRequest.request((ip, port), file_name, self.dir)
#print 'download %s success' % file_name
def merge(self):
res_path = self.dir + ('reduce%d.res' % self.id)
txt_path = self.dir + ('reduce%d.txt' % self.id)
fidres = open(res_path, 'wb')
fidtxt = open(txt_path, 'w')
map_fids = [ (open(self.dir + i, 'rb')) for i in self.map_files ]
heap = []
for fid in map_fids:
item = pickle.load(fid)
key, values = item
heap.append((key, values, fid))
heapq.heapify(heap)
#while--------------------------------------------#
pre_key = None
values = []
while True:
try:
key, val, fid = heapq.heappop(heap)
if pre_key != None and pre_key != key:
reduce_value = self.reducefn(pre_key, values)
pickle.dump((pre_key, reduce_value), fidres, True)
if isinstance(reduce_value, list):
line = str(pre_key) + ',' +' '.join([ str(i) for i in reduce_value] ) + '\n'
else:
line = str(pre_key) + ',' +str(reduce_value) + '\n'
fidtxt.write(line)
values=[]
try:
k,v = pickle.load(fid)
heapq.heappush(heap, (k,v,fid))
except Exception, ex:#read down
#print 'in else', Exception, ex
fid.close()
continue
pre_key = key
if isinstance(val, list):
values.extend(val)
else:
values.append(val)
except IndexError:
break
except Exception, ex:
print Exception, ex
break
reduce_value = self.reducefn(pre_key, values)
pickle.dump((pre_key, reduce_value), fidres, True)
if isinstance(reduce_value, list):
line = str(pre_key) + ',' +' '.join([ str(i) for i in reduce_value] ) + '\n'
else:
line = str(pre_key) + ',' +str(reduce_value) + '\n'
fidtxt.write(line)
#while--------------------------------------------#
fidres.close()
fidtxt.close()
if __name__ == '__main__':
'''
you can modify the max map and max reduce num your job
client can deal in params.py
'''
params.init()
logging.basicConfig(level=logging.INFO)
work = JobClient()
work.start()