/
scheduler.py
474 lines (402 loc) · 13.9 KB
/
scheduler.py
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import json
import logging
from addict import Dict
from six.moves.http_client import HTTPConnection
from binascii import b2a_base64
from .process import Process
from .interface import SchedulerDriver
logger = logging.getLogger(__name__)
class MesosSchedulerDriver(Process, SchedulerDriver):
_timeout = 10
def __init__(self, sched, framework, master_uri,
use_addict=False, implicit_acknowledgements=True,
principal=None, secret=None):
super(MesosSchedulerDriver, self).__init__()
self.sched = sched
self.master_uri = master_uri
self._framework = framework
self.detector = None
self._conn = None
self.version = None
self._failover = False
self._dict_cls = Dict if use_addict else dict
self.implicit_acknowledgements = implicit_acknowledgements
if principal is not None and secret is not None:
self._basic_credential = 'Basic %s' % (
b2a_base64(
('%s:%s' % (principal, secret)).encode('ascii')
).decode('ascii').strip()
)
else:
self._basic_credential = None
@property
def framework(self):
framework = dict(self._framework)
version = self.version and tuple(
int(n) for n in self.version.split('.')
)
capabilities = [
c for c in framework.get('capabilities', [])
if c['type'] != 'GPU_RESOURCES'
]
if version and version >= (1, 0, 0):
capabilities.append(dict(type='GPU_RESOURCES'))
if capabilities:
framework['capabilities'] = capabilities
else:
framework.pop('capabilities', None)
if 'failover_timeout' not in framework:
framework['failover_timeout'] = 100
return framework
@property
def framework_id(self):
id = self._framework.get('id')
return id and id.get('value')
@framework_id.setter
def framework_id(self, id):
self._framework['id'] = dict(value=id)
def _get_version(self, master):
if master is not None:
conn = None
host, port = master.split(':', 2)
port = int(port)
try:
conn = HTTPConnection(host, port, timeout=self._timeout)
conn.request('GET', '/version')
resp = conn.getresponse()
if resp.status < 200 or resp.status >= 300:
return
return json.loads(resp.read().decode('utf-8'))['version']
except Exception:
logger.exception('Error')
pass
finally:
if conn:
conn.close()
def change_master(self, master):
self.version = self._get_version(master)
super(MesosSchedulerDriver, self).change_master(master)
self._close()
def start(self):
super(MesosSchedulerDriver, self).start()
uri = self.master_uri
if uri.startswith('zk://') or uri.startswith('zoo://'):
from .detector import MasterDetector
self.detector = MasterDetector(uri[uri.index('://') + 3:], self)
self.detector.start()
else:
if ':' not in uri:
uri += ':5050'
self.change_master(uri)
def stop(self, failover=False):
with self._lock:
self._failover = failover
detector = self.detector
self.detector = None
if detector:
detector.stop()
super(MesosSchedulerDriver, self).stop()
def _shutdown(self):
if not self._failover:
try:
self._teardown()
except Exception:
logger.exception('Failed to Teardown')
def _get_conn(self):
if not self.connected:
return None
if self._conn is not None:
return self._conn
host, port = self.master.split(':', 2)
port = int(port)
self._conn = HTTPConnection(host, port, timeout=self._timeout)
return self._conn
def _send(self, body, path='/api/v1/scheduler', method='POST', headers={}):
with self._lock:
conn = self._get_conn()
if conn is None:
raise RuntimeError('Not connected yet')
if body != '':
data = json.dumps(body).encode('utf-8')
headers['Content-Type'] = 'application/json'
else:
data = ''
stream_id = self.stream_id
if stream_id:
headers['Mesos-Stream-Id'] = stream_id
if self._basic_credential:
headers['Authorization'] = self._basic_credential
try:
conn.request(method, path, body=data, headers=headers)
resp = conn.getresponse()
except Exception:
self._close()
raise
if resp.status < 200 or resp.status >= 300:
raise RuntimeError('Failed to send request %s: %s\n%s' % (
resp.status, resp.read(), data))
result = resp.read()
if not result:
return {}
try:
return json.loads(result.decode('utf-8'))
except Exception:
return {}
def _teardown(self):
if self.connected:
framework_id = self.framework_id
if framework_id:
self._send(dict(
type='TEARDOWN',
framework_id=dict(
value=framework_id,
),
))
self._framework.pop('id', None)
def acceptOffers(self, offer_ids, operations, filters=None):
if not operations:
return self.declineOffer(offer_ids, filters=filters)
framework_id = self.framework_id
assert framework_id
accept = dict(
offer_ids=offer_ids,
operations=operations,
)
if filters is not None:
accept['filters'] = filters
body = dict(
type='ACCEPT',
framework_id=dict(
value=framework_id,
),
accept=accept,
)
self._send(body)
def launchTasks(self, offer_ids, tasks, filters=None):
if not tasks:
return self.declineOffer(offer_ids, filters=filters)
framework_id = self.framework_id
assert framework_id
operations = [dict(
type='LAUNCH',
launch=dict(
task_infos=tasks
),
)]
self.acceptOffers(offer_ids, operations, filters=filters)
def declineOffer(self, offer_ids, filters=None):
framework_id = self.framework_id
assert framework_id
decline = dict(
offer_ids=[offer_ids] if isinstance(offer_ids, dict) else offer_ids
)
if filters is not None:
decline['filters'] = filters
body = dict(
type='DECLINE',
framework_id=dict(
value=framework_id,
),
decline=decline,
)
self._send(body)
def reviveOffers(self):
if not self.connected:
return
framework_id = self.framework_id
assert framework_id
body = dict(
type='REVIVE',
framework_id=dict(
value=framework_id,
),
)
self._send(body)
def killTask(self, task_id):
framework_id = self.framework_id
assert framework_id
body = dict(
type='KILL',
framework_id=dict(
value=framework_id,
),
kill=dict(
task_id=task_id,
),
)
self._send(body)
def acknowledgeStatusUpdate(self, status):
if 'uuid' in status:
framework_id = self.framework_id
assert framework_id
acknowledge = dict()
acknowledge['agent_id'] = status['agent_id']
acknowledge['task_id'] = status['task_id']
acknowledge['uuid'] = status['uuid']
body = dict(
type='ACKNOWLEDGE',
framework_id=dict(
value=framework_id,
),
acknowledge=acknowledge,
)
self._send(body)
def reconcileTasks(self, tasks):
framework_id = self.framework_id
assert framework_id
body = dict(
type='RECONCILE',
framework_id=dict(
value=framework_id,
),
reconcile=dict(
tasks=[dict(task_id=task['task_id']) for task in tasks],
),
)
self._send(body)
def sendFrameworkMessage(self, executor_id, agent_id, data):
framework_id = self.framework_id
assert framework_id
message = dict(
agent_id=agent_id,
executor_id=executor_id,
data=data,
)
body = dict(
type='MESSAGE',
framework_id=dict(
value=framework_id,
),
message=message,
)
self._send(body)
def requestResources(self, requests):
framework_id = self.framework_id
assert framework_id
body = dict(
type='REQUEST',
framework_id=dict(
value=framework_id,
),
request=dict(
requests=requests,
),
)
self._send(body)
def onNewMasterDetectedMessage(self, data):
master = None
try:
parsed = json.loads(data.decode('utf-8'))
if parsed and "address" in parsed:
ip = parsed["address"].get("ip")
port = parsed["address"].get("port")
if ip and port:
master = "%s:%s" % (ip, port)
except Exception:
logger.exception("No JSON content, probably connecting "
"to older Mesos version.")
if master:
self.change_master(master)
def onNoMasterDetectedMessage(self):
self.change_master(None)
def gen_request(self):
request = dict(
type='SUBSCRIBE',
subscribe=dict(
framework_info=self.framework
),
)
if 'id' in self._framework:
request['framework_id'] = self._framework['id']
data = json.dumps(request)
_authorization = ''
if self._basic_credential is not None:
_authorization = 'Authorization: %s\r\n' % (
self._basic_credential,
)
request = ('POST /api/v1/scheduler HTTP/1.1\r\nHost: %s\r\n'
'Content-Type: application/json\r\n'
'Accept: application/json\r\n%s'
'Connection: close\r\nContent-Length: %s\r\n\r\n%s') % (
self.master, _authorization, len(data), data
)
return request.encode('utf-8')
def _close(self):
if self._conn is not None:
self._conn.close()
self._conn = None
def on_close(self):
self._close()
self.sched.disconnected(self)
def on_subscribed(self, info):
reregistered = (self.framework_id is not None)
self.framework_id = info['framework_id']['value']
hostname, port = self.master.split(':', 2)
port = int(port)
master_info = dict(
hostname=hostname,
port=port,
)
if self.version:
master_info['version'] = self.version
if reregistered:
self.sched.reregistered(self, self._dict_cls(master_info))
else:
framework_id = dict(
value=self.framework_id
)
self.sched.registered(
self, self._dict_cls(framework_id),
self._dict_cls(master_info)
)
def on_offers(self, event):
offers = event['offers']
self.sched.resourceOffers(
self, [self._dict_cls(offer) for offer in offers]
)
def on_rescind(self, event):
offer_id = event['offer_id']
self.sched.offerRescinded(self, self._dict_cls(offer_id))
def on_update(self, event):
status = event['status']
self.sched.statusUpdate(self, self._dict_cls(status))
if self.implicit_acknowledgements:
self.acknowledgeStatusUpdate(status)
def on_message(self, message):
executor_id = message['executor_id']
agent_id = message['agent_id']
data = message['data']
self.sched.frameworkMessage(
self, self._dict_cls(executor_id), self._dict_cls(agent_id), data
)
def on_failure(self, failure):
agent_id = failure['agent_id']
if 'executor_id' not in failure:
self.sched.slaveLost(self, self._dict_cls(agent_id))
else:
self.sched.executorLost(
self, self._dict_cls(failure['executor_id']),
self._dict_cls(agent_id), failure['status']
)
def on_error(self, event):
message = event['message']
self.sched.error(self, message)
def on_event(self, event):
if 'type' in event:
_type = event['type'].lower()
if _type == 'heartbeat':
return
if _type not in event:
logger.error(
'Missing `%s` in event %s' %
(_type, event))
return
event = event[_type]
func_name = 'on_%s' % (_type,)
func = getattr(self, func_name, None)
if func is not None:
func(event)
else:
logger.error('Unknown type:%s, event:%s' % (_type, event))
else:
logger.error('Unknown event:%s' % (event,))