import weakref
import threading
import itertools
+import operator
try:
# pylint: disable=E0611
_LOCK = "_lock"
_QUEUE = "_queue"
+#: Retrieves "id" attribute
+_GetIdAttr = operator.attrgetter("id")
+
class CancelJob(Exception):
"""Special exception to cancel a job.
"""
+class QueueShutdown(Exception):
+ """Special exception to abort a job when the job queue is shutting down.
+
+ """
+
+
def TimeStampNow():
"""Returns the current timestamp.
logging.debug("Job %s is no longer waiting in the queue", self.id)
return (False, "Job %s is no longer waiting in the queue" % self.id)
+ def ChangePriority(self, priority):
+ """Changes the job priority.
+
+ @type priority: int
+ @param priority: New priority
+ @rtype: tuple; (bool, string)
+ @return: Boolean describing whether job's priority was successfully changed
+ and a text message
+
+ """
+ status = self.CalcStatus()
+
+ if status in constants.JOBS_FINALIZED:
+ return (False, "Job %s is finished" % self.id)
+ elif status == constants.JOB_STATUS_CANCELING:
+ return (False, "Job %s is cancelling" % self.id)
+ else:
+ assert status in (constants.JOB_STATUS_QUEUED,
+ constants.JOB_STATUS_WAITING,
+ constants.JOB_STATUS_RUNNING)
+
+ changed = False
+ for op in self.ops:
+ if (op.status == constants.OP_STATUS_RUNNING or
+ op.status in constants.OPS_FINALIZED):
+ assert not changed, \
+ ("Found opcode for which priority should not be changed after"
+ " priority has been changed for previous opcodes")
+ continue
+
+ assert op.status in (constants.OP_STATUS_QUEUED,
+ constants.OP_STATUS_WAITING)
+
+ changed = True
+
+ # Set new priority (doesn't modify opcode input)
+ op.priority = priority
+
+ if changed:
+ return (True, ("Priorities of pending opcodes for job %s have been"
+ " changed to %s" % (self.id, priority)))
+ else:
+ return (False, "Job %s had no pending opcodes" % self.id)
+
class _OpExecCallbacks(mcpu.OpExecCbBase):
def __init__(self, queue, job, op):
logging.debug("Canceling opcode")
raise CancelJob()
+ # See if queue is shutting down
+ if not self._queue.AcceptingJobsUnlocked():
+ logging.debug("Queue is shutting down")
+ raise QueueShutdown()
+
@locking.ssynchronized(_QUEUE, shared=1)
def NotifyStart(self):
"""Mark the opcode as running, not lock-waiting.
timestamp = utils.SplitTime(time.time())
self._AppendFeedback(timestamp, log_type, log_msg)
- def CheckCancel(self):
- """Check whether job has been cancelled.
+ def CurrentPriority(self):
+ """Returns current priority for opcode.
"""
assert self._op.status in (constants.OP_STATUS_WAITING,
# Cancel here if we were asked to
self._CheckCancel()
+ return self._op.priority
+
def SubmitManyJobs(self, jobs):
"""Submits jobs for processing.
class _JobFileChangesWaiter(object):
- def __init__(self, filename):
+ def __init__(self, filename, _inotify_wm_cls=pyinotify.WatchManager):
"""Initializes this class.
@type filename: string
@raises errors.InotifyError: if the notifier cannot be setup
"""
- self._wm = pyinotify.WatchManager()
+ self._wm = _inotify_wm_cls()
self._inotify_handler = \
asyncnotifier.SingleFileEventHandler(self._wm, self._OnInotify, filename)
self._notifier = \
class _JobChangesWaiter(object):
- def __init__(self, filename):
+ def __init__(self, filename, _waiter_cls=_JobFileChangesWaiter):
"""Initializes this class.
@type filename: string
"""
self._filewaiter = None
self._filename = filename
+ self._waiter_cls = _waiter_cls
def Wait(self, timeout):
"""Waits for a job to change.
# If this point is reached, return immediately and let caller check the job
# file again in case there were changes since the last check. This avoids a
# race condition.
- self._filewaiter = _JobFileChangesWaiter(self._filename)
+ self._filewaiter = self._waiter_cls(self._filename)
return True
return result
def __call__(self, filename, job_load_fn,
- fields, prev_job_info, prev_log_serial, timeout):
+ fields, prev_job_info, prev_log_serial, timeout,
+ _waiter_cls=_JobChangesWaiter):
"""Waits for changes on a job.
@type filename: string
counter = itertools.count()
try:
check_fn = _JobChangesChecker(fields, prev_job_info, prev_log_serial)
- waiter = _JobChangesWaiter(filename)
+ waiter = _waiter_cls(filename)
try:
return utils.Retry(compat.partial(self._CheckForChanges,
counter, job_load_fn, check_fn),
wait_fn=waiter.Wait)
finally:
waiter.Close()
- except (errors.InotifyError, errors.JobLost):
+ except errors.JobLost:
return None
except utils.RetryTimeout:
return constants.JOB_NOTCHANGED
# Make sure not to hold queue lock while calling ExecOpCode
result = self.opexec_fn(op.input,
_OpExecCallbacks(self.queue, self.job, op),
- timeout=timeout, priority=op.priority)
+ timeout=timeout)
except mcpu.LockAcquireTimeout:
assert timeout is not None, "Received timeout for blocking acquire"
logging.debug("Couldn't acquire locks in %0.6fs", timeout)
if op.status == constants.OP_STATUS_CANCELING:
return (constants.OP_STATUS_CANCELING, None)
+ # Queue is shutting down, return to queued
+ if not self.queue.AcceptingJobsUnlocked():
+ return (constants.OP_STATUS_QUEUED, None)
+
# Stay in waitlock while trying to re-acquire lock
return (constants.OP_STATUS_WAITING, None)
except CancelJob:
logging.exception("%s: Canceling job", opctx.log_prefix)
assert op.status == constants.OP_STATUS_CANCELING
return (constants.OP_STATUS_CANCELING, None)
+
+ except QueueShutdown:
+ logging.exception("%s: Queue is shutting down", opctx.log_prefix)
+
+ assert op.status == constants.OP_STATUS_WAITING
+
+ # Job hadn't been started yet, so it should return to the queue
+ return (constants.OP_STATUS_QUEUED, None)
+
except Exception, err: # pylint: disable=W0703
logging.exception("%s: Caught exception in %s",
opctx.log_prefix, opctx.summary)
assert not waitjob
- if op.status == constants.OP_STATUS_WAITING:
- # Couldn't get locks in time
+ if op.status in (constants.OP_STATUS_WAITING,
+ constants.OP_STATUS_QUEUED):
+ # waiting: Couldn't get locks in time
+ # queued: Queue is shutting down
assert not op.end_timestamp
else:
# Finalize opcode
else:
assert op.status in constants.OPS_FINALIZED
- if op.status == constants.OP_STATUS_WAITING or waitjob:
+ if op.status == constants.OP_STATUS_QUEUED:
+ # Queue is shutting down
+ assert not waitjob
+
+ finalize = False
+
+ # Reset context
+ job.cur_opctx = None
+
+ # In no case must the status be finalized here
+ assert job.CalcStatus() == constants.JOB_STATUS_QUEUED
+
+ elif op.status == constants.OP_STATUS_WAITING or waitjob:
finalize = False
if not waitjob and opctx.CheckPriorityIncrease():
logging.error("Failed to upload file %s to node %s: %s",
file_name, node_name, msg)
+ # Set queue drained flag
+ result = \
+ self._GetRpc(addrs).call_jobqueue_set_drain_flag([node_name],
+ self._drained)
+ msg = result[node_name].fail_msg
+ if msg:
+ logging.error("Failed to set queue drained flag on node %s: %s",
+ node_name, msg)
+
self._nodes[node_name] = node.primary_ip
@locking.ssynchronized(_LOCK)
@return: a list of job identifiers.
"""
- assert ht.TPositiveInt(count)
+ assert ht.TNonNegativeInt(count)
# New number
serial = self._last_serial + count
@param drain_flag: Whether to set or unset the drain flag
"""
+ # Change flag locally
jstore.SetDrainFlag(drain_flag)
self._drained = drain_flag
+ # ... and on all nodes
+ (names, addrs) = self._GetNodeIp()
+ result = \
+ self._GetRpc(addrs).call_jobqueue_set_drain_flag(names, drain_flag)
+ self._CheckRpcResult(result, self._nodes,
+ "Setting queue drain flag to %s" % drain_flag)
+
return True
@_RequireOpenQueue
"""
assert self._lock.is_owned(shared=0), "Must own lock in exclusive mode"
self._wpool.AddManyTasks([(job, ) for job in jobs],
- priority=[job.CalcPriority() for job in jobs])
+ priority=[job.CalcPriority() for job in jobs],
+ task_id=map(_GetIdAttr, jobs))
def _GetJobStatusForDependencies(self, job_id):
"""Gets the status of a job for dependencies.
return self._ModifyJobUnlocked(job_id, lambda job: job.Cancel())
+ @locking.ssynchronized(_LOCK)
+ @_RequireOpenQueue
+ def ChangeJobPriority(self, job_id, priority):
+ """Changes a job's priority.
+
+ @type job_id: int
+ @param job_id: ID of the job whose priority should be changed
+ @type priority: int
+ @param priority: New priority
+
+ """
+ logging.info("Changing priority of job %s to %s", job_id, priority)
+
+ if priority not in constants.OP_PRIO_SUBMIT_VALID:
+ allowed = utils.CommaJoin(constants.OP_PRIO_SUBMIT_VALID)
+ raise errors.GenericError("Invalid priority %s, allowed are %s" %
+ (priority, allowed))
+
+ def fn(job):
+ (success, msg) = job.ChangePriority(priority)
+
+ if success:
+ try:
+ self._wpool.ChangeTaskPriority(job.id, job.CalcPriority())
+ except workerpool.NoSuchTask:
+ logging.debug("Job %s is not in workerpool at this time", job.id)
+
+ return (success, msg)
+
+ return self._ModifyJobUnlocked(job_id, fn)
+
def _ModifyJobUnlocked(self, job_id, mod_fn):
"""Modifies a job.
return self._wpool.HasRunningTasks()
+ def AcceptingJobsUnlocked(self):
+ """Returns whether jobs are accepted.
+
+ Once L{PrepareShutdown} has been called, no new jobs are accepted and the
+ queue is shutting down.
+
+ @rtype: bool
+
+ """
+ return self._accepting_jobs
+
@locking.ssynchronized(_LOCK)
@_RequireOpenQueue
def Shutdown(self):
projects / ganeti-local / blobdiff