def _send_tasks_for_reconciliation(self):
"""Sends the IDs of any tasks that need to be reconciled
"""
when = now()
task_ids = cleanup_mgr.get_task_ids_for_reconciliation(when)
task_ids.extend(running_job_mgr.get_task_ids_for_reconciliation(when))
recon_mgr.add_task_ids(task_ids)
def _reconcile_tasks(self, when):
"""Sends any tasks that need to be reconciled to the reconciliation manager
:param when: The current time
:type when: :class:`datetime.datetime`
"""
task_ids = []
for task in task_mgr.get_tasks_to_reconcile(when):
task_ids.append(task.id)
recon_mgr.add_task_ids(task_ids)
def slaveLost(self, driver, slaveId):
"""
Invoked when a slave has been determined unreachable (e.g., machine
failure, network partition.) Most frameworks will need to reschedule
any tasks launched on this slave on a new slave.
See documentation for :meth:`mesos_api.mesos.Scheduler.slaveLost`.
"""
started = now()
agent_id = slaveId.value
node = node_mgr.get_node(agent_id)
if node:
logger.error('Node lost on host %s', node.hostname)
else:
logger.error('Node lost on agent %s', agent_id)
node_mgr.lost_node(agent_id)
offer_mgr.lost_node(agent_id)
# Fail job executions that were running on the lost node
if node:
for running_job_exe in running_job_mgr.get_job_exes_on_node(node.id):
try:
running_job_exe.execution_lost(started)
except DatabaseError:
logger.exception('Error failing lost job execution: %s', running_job_exe.id)
# Error failing execution, add task so it can be reconciled
task = running_job_exe.current_task
if task:
recon_mgr.add_task_ids([task.id])
if running_job_exe.is_finished():
running_job_mgr.remove_job_exe(running_job_exe.id)
cleanup_mgr.add_job_execution(running_job_exe)
duration = now() - started
msg = 'Scheduler slaveLost() took %.3f seconds'
if duration > ScaleScheduler.DATABASE_WARN_THRESHOLD:
logger.warning(msg, duration.total_seconds())
else:
logger.debug(msg, duration.total_seconds())
def _reconcile_running_jobs(self):
"""Looks up all currently running jobs in the database and sets them up to be reconciled with Mesos"""
# List of task IDs to reconcile
task_ids = []
# Query for job executions that are running
job_exes = JobExecution.objects.get_running_job_exes()
# Find current task IDs for running executions
for job_exe in job_exes:
running_job_exe = running_job_mgr.get_job_exe(job_exe.id)
if running_job_exe:
task = running_job_exe.current_task
if task:
task_ids.append(task.id)
else:
# Fail any executions that the scheduler has lost
Queue.objects.handle_job_failure(job_exe.id, now(), [],
Error.objects.get_builtin_error('scheduler-lost'))
# Send task IDs to reconciliation thread
recon_mgr.add_task_ids(task_ids)
def statusUpdate(self, driver, status):
"""
Invoked when the status of a task has changed (e.g., a slave is lost
and so the task is lost, a task finishes and an executor sends a
status update saying so, etc.) Note that returning from this callback
acknowledges receipt of this status update. If for whatever reason
the scheduler aborts during this callback (or the process exits)
another status update will be delivered. Note, however, that this is
currently not true if the slave sending the status update is lost or
fails during that time.
See documentation for :meth:`mesos_api.mesos.Scheduler.statusUpdate`.
"""
started = now()
model = utils.create_task_update_model(status)
mesos_status = model.status
task_update = TaskStatusUpdate(model, utils.get_status_agent_id(status))
task_id = task_update.task_id
if mesos_status == 'TASK_LOST':
logger.warning('Status update for task %s: %s', task_id, mesos_status)
else:
logger.info('Status update for task %s: %s', task_id, mesos_status)
# Since we have a status update for this task, remove it from reconciliation set
recon_mgr.remove_task_id(task_id)
# Hand off task update to be saved in the database
task_update_mgr.add_task_update(model)
if task_id.startswith(CLEANUP_TASK_ID_PREFIX):
cleanup_mgr.handle_task_update(task_update)
else:
job_exe_id = JobExecution.get_job_exe_id(task_id)
try:
running_job_exe = running_job_mgr.get_job_exe(job_exe_id)
if running_job_exe:
running_job_exe.task_update(task_update)
# Remove finished job execution
if running_job_exe.is_finished():
running_job_mgr.remove_job_exe(job_exe_id)
cleanup_mgr.add_job_execution(running_job_exe)
else:
# Scheduler doesn't have any knowledge of this job execution
Queue.objects.handle_job_failure(job_exe_id, now(), [],
Error.objects.get_builtin_error('scheduler-lost'))
except Exception:
logger.exception('Error handling status update for job execution: %s', job_exe_id)
# Error handling status update, add task so it can be reconciled
recon_mgr.add_task_ids([task_id])
duration = now() - started
msg = 'Scheduler statusUpdate() took %.3f seconds'
if duration > ScaleScheduler.DATABASE_WARN_THRESHOLD:
logger.warning(msg, duration.total_seconds())
else:
logger.debug(msg, duration.total_seconds())
