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worker.py
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worker.py
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import socket
import json
import threading
import Queue
import time
import pprint
import random
import node
import functools
import operator
import multiprocessing
def get_process_hostname():
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("8.8.8.8", 80))
return s.getsockname()[0]
s.close()
NIMBUS_HOSTNAME = 'fa18-cs425-g03-01.cs.illinois.edu'
NIMBUS_HOSTNAME_2 = 'fa18-cs425-g03-02.cs.illinois.edu'
NIMBUS_PORT = 20000
MY_HOSTNAME = get_process_hostname()
MY_PORT_LISTEN_FOR_JOB = 6000
MY_PORT_LISTEN_FOR_ACKS = 4999
FILE_SYSTEM_RECVPORT = 10000
'''
Forward tuple to children
'''
def forwardTupleToChildren(task_details, forward_tuple, sock):
children = task_details['children_ip_port'] # list
for child_ip, child_port in children:
try:
sock.sendto(json.dumps(forward_tuple), (child_ip, child_port))
except Exception as e:
print e
print 'Unable to contact child'
print str(child_ip) + ":" + str(child_port)
return
class Supervisor(object):
def __init__(self):
self.buffer = {}
# self.process_list = []
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.settimeout(1)
# join the fun
try:
data = {"type": "JOIN_WORKER"}
sock.sendto(json.dumps(data), (NIMBUS_HOSTNAME, NIMBUS_PORT))
print "MY_IP:"
print MY_HOSTNAME
except socket.timeout as e:
print 'Unable to contact nimbus 1'
return
try:
data = {"type": "JOIN_WORKER"}
sock.sendto(json.dumps(data), (NIMBUS_HOSTNAME, NIMBUS_PORT))
print "MY_IP:"
print MY_HOSTNAME
except socket.timeout as e:
print 'Unable to contact nimbus 1'
return
#If nimbus 1 has failed, try to contact nimbus 2
try:
data = {"type": "JOIN_WORKER"}
sock.sendto(json.dumps(data), (NIMBUS_HOSTNAME_2, NIMBUS_PORT))
print "MY_IP:"
print MY_HOSTNAME
except socket.timeout as e:
print 'Unable to contact nimbus 2'
return
try:
data = {"type": "JOIN_WORKER"}
sock.sendto(json.dumps(data), (NIMBUS_HOSTNAME_2, NIMBUS_PORT))
print "MY_IP:"
print MY_HOSTNAME
except socket.timeout as e:
print 'Unable to contact nimbus 2'
return
t1 = threading.Thread(target = self.listen, args = ())
t1.daemon = True
t1.start()
# start the node failure detector component and sdfs
failure_detector_node = node.Node()
failure_detector_node.start()
def listen(self):
print "Supervisor.listen() called"
# set up socket to listen for incoming jobs
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((MY_HOSTNAME, MY_PORT_LISTEN_FOR_JOB))
while(1):
# task_details, addr = sock.recvfrom(1024000)
data, addr = sock.recvfrom(1024000)
t = threading.Thread(target = self.process_supervisor_message, args = (data, ))
t.daemon = True
t.start()
def process_supervisor_message(self, data):
print "received data"
data = json.loads(data)
if data['type'].upper() == 'NEW':
task_details = data['task_details']
worker_id = task_details['worker_id']
# for process_id in self.process_list:
# process_id.terminate()
if task_details['type'] == 'spout':
spout = Spout(task_details)
self.buffer[worker_id] = spout
t_id = threading.Thread(target = spout.start)
t_id.daemon = True
t_id.start()
elif task_details['type'] == 'bolt':
bolt = Bolt(task_details)
self.buffer[worker_id] = bolt
t_id = threading.Thread(target = bolt.start)
t_id.daemon = True
t_id.start()
elif data['type'].upper() == 'UPDATE':
pprint.pprint(data['task_details'])
task_details = data['task_details']
worker_id = task_details['worker_id']
print "self.buffer[worker_id].task_details before:"
print self.buffer[worker_id].task_details
self.buffer[worker_id].task_details = task_details
print "self.buffer[worker_id].task_details after:"
print self.buffer[worker_id].task_details
elif data['type'].upper() == 'SPOUT_UPDATE':
task_details = data['task_details']
worker_id = task_details['worker_id']
self.buffer[worker_id].spout_ip = task_details['spout_ip_port'][0]
self.buffer[worker_id].spout_port = task_details['spout_ip_port'][1]
'''
Spout is started by a supervisor;
It reads a given source (file/db/etc) line-by-line, converts it into tuples, and forwards to child(ren)
'''
class Spout(object):
def __init__(self, task_details):
self.task_details = task_details
self.buffer = dict()
# socket for sending tuples to child to avoid creating socket for each tuple
self.send_to_child_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.send_to_child_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# set to False when KILL_SPOUT message received. This is to stop the spout from forwarding tuples further.
self.is_not_killed = True
self.KILL_SPOUT_PORT = 6543
self.kill_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.kill_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.kill_sock.bind((get_process_hostname(), self.KILL_SPOUT_PORT))
def start(self):
print "Spout started"
print self.task_details
t1 = threading.Thread(target = self.send_data)
t1.daemon = True
t1.start()
t2 = threading.Thread(target=self.listen_for_kill_command)
t2.daemon = True
t2.start()
def send_data(self):
start_poll = False
tuple_id = 0 # incremented tuple_id added to each tuple
print "spout reading and sending data..."
# read data line-by-line from source, add msgId, and forward to child bolt(s)
with open('input/' + self.task_details['input']) as infile:
for line in infile:
# check if spout has not been killed
if self.is_not_killed:
line = line.rstrip()
# split line and store as tuple
forward_tuple = tuple(line.split(','))
print forward_tuple
# store the tuple in buffer
self.buffer[tuple_id]= {
'tuple_id': tuple_id,
'tuple': forward_tuple,
'timestamp': time.time() # epoch. number of seconds.
}
# forward the tuple to child bolt(s)
forwardTupleToChildren(self.task_details, self.buffer[tuple_id], self.send_to_child_sock)
time.sleep(0.01)
tuple_id += 1
else:
break
if self.is_not_killed:
print "spout sent all data from file"
time.sleep(2)
# after all tuples sent, send 'EXIT' to all children
EXIT_TUPLE = {
'tuple_id': 'EXIT',
'tuple': None,
'timestamp': None
}
forwardTupleToChildren(self.task_details, EXIT_TUPLE, self.send_to_child_sock)
print 'Spout shutting down...'
return
else:
print "Spout streaming stopped due to KILL_SPOUT"
def listen_for_kill_command(self):
while True:
data, addr = self.kill_sock.recvfrom(1000)
if data.strip() == 'KILL_SPOUT':
self.is_not_killed = False
class Bolt(object):
def __init__(self, task_details):
self.task_details = task_details
self.listen_port = self.task_details['listen_port']
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.sock.bind((get_process_hostname(), self.listen_port))
self.queue = Queue.Queue()
self.function = eval(self.task_details['function'])
self.output_file = None # initialized in start()
self.spout_ip, self.spout_port = self.task_details['spout_ip_port']
self.send_to_child_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.send_to_child_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.send_ack_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.send_ack_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.written_tuples = set()
self.client_ip_port = self.task_details['client_ip_port']
self.state = None
def start(self):
# open output file and save handle if sink
if self.task_details['sink']:
# get file name
output_filename = self.task_details['output']
self.output_file = open("local_files/" + output_filename, 'w', 0) # 0 to write to file immediately
# Start two threads, one to listen for new jobs, the other to start the bolts for it
#
t1 = threading.Thread(target = self.listen)
t1.daemon = True
t1.start()
t2 = threading.Thread(target = self.process_and_send)
t2.daemon = True
t2.start()
def listen(self):
print "Waiting for tuples..."
while (1):
# time.sleep(0.001)
data, addr = self.sock.recvfrom(1024000)
data = json.loads(data)
self.queue.put(data)
def process_and_send(self):
while True:
item = self.queue.get()
tuple_id, tuple_data = item['tuple_id'], item['tuple']
if tuple_id == 'EXIT':
if self.task_details['sink']:
if self.task_details['function_type'] == 'aggregate':
self.output_file.write(str(self.state))
self.output_file.write('\n')
self.saveResults()
data = {
'type': 'JOB_COMPLETED',
'master_ip': self.task_details['file_system_master'],
'output_file' : self.task_details['output']
}
self.send_to_child_sock.sendto(json.dumps(data), (self.client_ip_port[0], self.client_ip_port[1]))
return
else:
forwardTupleToChildren(self.task_details, item, self.send_to_child_sock)
print "EXIT received. Bolt shutting down..."
return
# if bolt function is a filter, returns a boolean for each tuple
if self.task_details['function_type'] == 'filter':
output = self.function(tuple_data)
if output: # if true, forward to next bolt
print item
if self.task_details['sink']:
# if tuple was already written, do not write to file again
if tuple_id in self.written_tuples:
pass
else:
self.output_file.write((output.encode('utf-8')))
self.output_file.write('\n')
else:
forwardTupleToChildren(self.task_details, item, self.send_to_child_sock)
else:
pass
elif self.task_details['function_type'] == 'transform':
output = self.function(tuple_data)
print output
if output:
if self.task_details['sink']:
# send ACK+REMOVE message to spout
if tuple_id in self.written_tuples:
print 'Line already written, ignore'
else:
self.written_tuples.add(tuple_id)
self.output_file.write((output.encode('utf-8')))
self.output_file.write('\n')
else:
item['tuple'] = output
forwardTupleToChildren(self.task_details, item, self.send_to_child_sock)
elif self.task_details['function_type'] == 'aggregate':
if self.state is None:
self.state = tuple_data
else:
self.state = functools.reduce(self.function, [self.state, tuple_data])
print 'Intermediate output at sink: ' + str(self.state)
elif self.task_details['function_type'] == 'join':
join_columns = self.task_details['join_columns']
join_file = self.task_details['join_file']
with open(join_file, 'r') as jf:
lines = jf.readlines()
for row in lines:
if tuple_data[join_columns] == lines[join_columns]:
#Matches condition, join tuple and forward to children
new_tuple = tuple_data + lines
item['tuple'] = new_tuple
if self.task_details['sink']:
self.output_file.write(output.encode('utf-8'))
self.output_file.write('\n')
else:
forwardTupleToChildren(self.task_details, item, self.send_to_child_sock)
def saveResults(self):
master_socket = None
master_host = self.task_details['file_system_master']
master_port = FILE_SYSTEM_RECVPORT
try:
master_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
master_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
master_socket.connect((master_host, master_port))
except socket.error as e: #If connection to remote machine fails
print 'Could not connect to ' + str(master_host)
return
full_command = 'PUT ' + self.task_details['output'] + ' ' + self.task_details['output']
print full_command
try:
master_socket.sendall(full_command)
start_time = time.time()
ret_value = master_socket.recv(1024)
if ret_value.strip() == 'ACK':
end_time = time.time()
print 'Output successfully uploaded to SDFS'
print 'Time taken to upload file: '
print end_time - start_time
except socket.error as e:
print 'Error during PUT'
def main():
# supervisor connects to nimbus to let it know that it is available
supervisor = Supervisor()
# supervisor.listen()
if __name__ == '__main__':
main()