import logging
import errno
-import re
import time
import weakref
import threading
+import itertools
try:
- # pylint: disable-msg=E0611
+ # pylint: disable=E0611
from pyinotify import pyinotify
except ImportError:
import pyinotify
@ivar writable: Whether the job is allowed to be modified
"""
- # pylint: disable-msg=W0212
+ # pylint: disable=W0212
__slots__ = ["queue", "id", "ops", "log_serial", "ops_iter", "cur_opctx",
"received_timestamp", "start_timestamp", "end_timestamp",
"__weakref__", "processor_lock", "writable"]
obj.writable = writable
obj.ops_iter = None
obj.cur_opctx = None
- obj.processor_lock = threading.Lock()
+
+ # Read-only jobs are not processed and therefore don't need a lock
+ if writable:
+ obj.processor_lock = threading.Lock()
+ else:
+ obj.processor_lock = None
def __repr__(self):
status = ["%s.%s" % (self.__class__.__module__, self.__class__.__name__),
if op.status == constants.OP_STATUS_QUEUED:
pass
- elif op.status == constants.OP_STATUS_WAITLOCK:
- status = constants.JOB_STATUS_WAITLOCK
+ elif op.status == constants.OP_STATUS_WAITING:
+ status = constants.JOB_STATUS_WAITING
elif op.status == constants.OP_STATUS_RUNNING:
status = constants.JOB_STATUS_RUNNING
elif op.status == constants.OP_STATUS_CANCELING:
self.Finalize()
return (True, "Job %s canceled" % self.id)
- elif status == constants.JOB_STATUS_WAITLOCK:
+ elif status == constants.JOB_STATUS_WAITING:
# The worker will notice the new status and cancel the job
self.MarkUnfinishedOps(constants.OP_STATUS_CANCELING, None)
return (True, "Job %s will be canceled" % self.id)
This is called from the mcpu code as a notifier function, when the LU is
finally about to start the Exec() method. Of course, to have end-user
visible results, the opcode must be initially (before calling into
- Processor.ExecOpCode) set to OP_STATUS_WAITLOCK.
+ Processor.ExecOpCode) set to OP_STATUS_WAITING.
"""
assert self._op in self._job.ops
- assert self._op.status in (constants.OP_STATUS_WAITLOCK,
+ assert self._op.status in (constants.OP_STATUS_WAITING,
constants.OP_STATUS_CANCELING)
# Cancel here if we were asked to
"""Check whether job has been cancelled.
"""
- assert self._op.status in (constants.OP_STATUS_WAITLOCK,
+ assert self._op.status in (constants.OP_STATUS_WAITING,
constants.OP_STATUS_CANCELING)
# Cancel here if we were asked to
# no changes.
if (status not in (constants.JOB_STATUS_QUEUED,
constants.JOB_STATUS_RUNNING,
- constants.JOB_STATUS_WAITLOCK) or
+ constants.JOB_STATUS_WAITING) or
job_info != self._prev_job_info or
(log_entries and self._prev_log_serial != log_entries[0][0])):
logging.debug("Job %s changed", job.id)
"""
@staticmethod
- def _CheckForChanges(job_load_fn, check_fn):
+ def _CheckForChanges(counter, job_load_fn, check_fn):
+ if counter.next() > 0:
+ # If this isn't the first check the job is given some more time to change
+ # again. This gives better performance for jobs generating many
+ # changes/messages.
+ time.sleep(0.1)
+
job = job_load_fn()
if not job:
raise errors.JobLost()
@param timeout: maximum time to wait in seconds
"""
+ counter = itertools.count()
try:
check_fn = _JobChangesChecker(fields, prev_job_info, prev_log_serial)
waiter = _JobChangesWaiter(filename)
try:
return utils.Retry(compat.partial(self._CheckForChanges,
- job_load_fn, check_fn),
+ counter, job_load_fn, check_fn),
utils.RETRY_REMAINING_TIME, timeout,
wait_fn=waiter.Wait)
finally:
class _JobProcessor(object):
+ (DEFER,
+ WAITDEP,
+ FINISHED) = range(1, 4)
+
def __init__(self, queue, opexec_fn, job,
_timeout_strategy_factory=mcpu.LockAttemptTimeoutStrategy):
"""Initializes this class.
"""
assert op in job.ops
assert op.status in (constants.OP_STATUS_QUEUED,
- constants.OP_STATUS_WAITLOCK)
+ constants.OP_STATUS_WAITING)
update = False
op.result = None
if op.status == constants.OP_STATUS_QUEUED:
- op.status = constants.OP_STATUS_WAITLOCK
+ op.status = constants.OP_STATUS_WAITING
update = True
if op.start_timestamp is None:
job.start_timestamp = op.start_timestamp
update = True
- assert op.status == constants.OP_STATUS_WAITLOCK
+ assert op.status == constants.OP_STATUS_WAITING
return update
"""
op = opctx.op
- assert op.status == constants.OP_STATUS_WAITLOCK
+ assert op.status == constants.OP_STATUS_WAITING
timeout = opctx.GetNextLockTimeout()
assert timeout is not None, "Received timeout for blocking acquire"
logging.debug("Couldn't acquire locks in %0.6fs", timeout)
- assert op.status in (constants.OP_STATUS_WAITLOCK,
+ assert op.status in (constants.OP_STATUS_WAITING,
constants.OP_STATUS_CANCELING)
# Was job cancelled while we were waiting for the lock?
return (constants.OP_STATUS_CANCELING, None)
# Stay in waitlock while trying to re-acquire lock
- return (constants.OP_STATUS_WAITLOCK, None)
+ 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 Exception, err: # pylint: disable-msg=W0703
+ except Exception, err: # pylint: disable=W0703
logging.exception("%s: Caught exception in %s",
opctx.log_prefix, opctx.summary)
return (constants.OP_STATUS_ERROR, _EncodeOpError(err))
"""Continues execution of a job.
@param _nextop_fn: Callback function for tests
- @rtype: bool
- @return: True if job is finished, False if processor needs to be called
- again
+ @return: C{FINISHED} if job is fully processed, C{DEFER} if the job should
+ be deferred and C{WAITDEP} if the dependency manager
+ (L{_JobDependencyManager}) will re-schedule the job when appropriate
"""
queue = self.queue
# Don't do anything for finalized jobs
if job.CalcStatus() in constants.JOBS_FINALIZED:
- return True
+ return self.FINISHED
# Is a previous opcode still pending?
if job.cur_opctx:
for i in job.ops[opctx.index + 1:])
assert op.status in (constants.OP_STATUS_QUEUED,
- constants.OP_STATUS_WAITLOCK,
+ constants.OP_STATUS_WAITING,
constants.OP_STATUS_CANCELING)
assert (op.priority <= constants.OP_PRIO_LOWEST and
if op.status != constants.OP_STATUS_CANCELING:
assert op.status in (constants.OP_STATUS_QUEUED,
- constants.OP_STATUS_WAITLOCK)
+ constants.OP_STATUS_WAITING)
# Prepare to start opcode
if self._MarkWaitlock(job, op):
# Write to disk
queue.UpdateJobUnlocked(job)
- assert op.status == constants.OP_STATUS_WAITLOCK
- assert job.CalcStatus() == constants.JOB_STATUS_WAITLOCK
+ assert op.status == constants.OP_STATUS_WAITING
+ assert job.CalcStatus() == constants.JOB_STATUS_WAITING
assert job.start_timestamp and op.start_timestamp
assert waitjob is None
# Check if waiting for a job is necessary
waitjob = self._CheckDependencies(queue, job, opctx)
- assert op.status in (constants.OP_STATUS_WAITLOCK,
+ assert op.status in (constants.OP_STATUS_WAITING,
constants.OP_STATUS_CANCELING,
constants.OP_STATUS_ERROR)
assert not waitjob
- if op.status == constants.OP_STATUS_WAITLOCK:
+ if op.status == constants.OP_STATUS_WAITING:
# Couldn't get locks in time
assert not op.end_timestamp
else:
else:
assert op.status in constants.OPS_FINALIZED
- if op.status == constants.OP_STATUS_WAITLOCK or waitjob:
+ if op.status == constants.OP_STATUS_WAITING or waitjob:
finalize = False
if not waitjob and opctx.CheckPriorityIncrease():
op.priority >= constants.OP_PRIO_HIGHEST)
# In no case must the status be finalized here
- assert job.CalcStatus() == constants.JOB_STATUS_WAITLOCK
+ assert job.CalcStatus() == constants.JOB_STATUS_WAITING
else:
# Ensure all opcodes so far have been successful
if finalize:
logging.info("Finished job %s, status = %s", job.id, job.CalcStatus())
- # TODO: Check locking
- queue.depmgr.NotifyWaiters(job.id)
- return True
+ return self.FINISHED
assert not waitjob or queue.depmgr.JobWaiting(job)
- return bool(waitjob)
+ if waitjob:
+ return self.WAITDEP
+ else:
+ return self.DEFER
finally:
assert job.writable, "Job became read-only while being processed"
queue.release()
+def _EvaluateJobProcessorResult(depmgr, job, result):
+ """Looks at a result from L{_JobProcessor} for a job.
+
+ To be used in a L{_JobQueueWorker}.
+
+ """
+ if result == _JobProcessor.FINISHED:
+ # Notify waiting jobs
+ depmgr.NotifyWaiters(job.id)
+
+ elif result == _JobProcessor.DEFER:
+ # Schedule again
+ raise workerpool.DeferTask(priority=job.CalcPriority())
+
+ elif result == _JobProcessor.WAITDEP:
+ # No-op, dependency manager will re-schedule
+ pass
+
+ else:
+ raise errors.ProgrammerError("Job processor returned unknown status %s" %
+ (result, ))
+
+
class _JobQueueWorker(workerpool.BaseWorker):
"""The actual job workers.
"""
- def RunTask(self, job): # pylint: disable-msg=W0221
+ def RunTask(self, job): # pylint: disable=W0221
"""Job executor.
@type job: L{_QueuedJob}
@param job: the job to be processed
"""
+ assert job.writable, "Expected writable job"
+
# Ensure only one worker is active on a single job. If a job registers for
# a dependency job, and the other job notifies before the first worker is
# done, the job can end up in the tasklist more than once.
wrap_execop_fn = compat.partial(self._WrapExecOpCode, setname_fn,
proc.ExecOpCode)
- if not _JobProcessor(queue, wrap_execop_fn, job)():
- # Schedule again
- raise workerpool.DeferTask(priority=job.CalcPriority())
+ _EvaluateJobProcessorResult(queue.depmgr, job,
+ _JobProcessor(queue, wrap_execop_fn, job)())
@staticmethod
def _WrapExecOpCode(setname_fn, execop_fn, op, *args, **kwargs):
CONTINUE,
WRONGSTATUS) = range(1, 6)
- # TODO: Export waiter information to lock monitor
-
def __init__(self, getstatus_fn, enqueue_fn):
"""Initializes this class.
self._lock = locking.SharedLock("JobDepMgr")
@locking.ssynchronized(_LOCK, shared=1)
+ def GetLockInfo(self, requested): # pylint: disable=W0613
+ """Retrieves information about waiting jobs.
+
+ @type requested: set
+ @param requested: Requested information, see C{query.LQ_*}
+
+ """
+ # No need to sort here, that's being done by the lock manager and query
+ # library. There are no priorities for notifying jobs, hence all show up as
+ # one item under "pending".
+ return [("job/%s" % job_id, None, None,
+ [("job", [job.id for job in waiters])])
+ for job_id, waiters in self._waiters.items()
+ if waiters]
+
+ @locking.ssynchronized(_LOCK, shared=1)
def JobWaiting(self, job):
"""Checks if a job is waiting.
" not one of '%s' as required" %
(dep_job_id, status, utils.CommaJoin(dep_status)))
- @locking.ssynchronized(_LOCK)
+ def _RemoveEmptyWaitersUnlocked(self):
+ """Remove all jobs without actual waiters.
+
+ """
+ for job_id in [job_id for (job_id, waiters) in self._waiters.items()
+ if not waiters]:
+ del self._waiters[job_id]
+
def NotifyWaiters(self, job_id):
"""Notifies all jobs waiting for a certain job ID.
+ @attention: Do not call until L{CheckAndRegister} returned a status other
+ than C{WAITDEP} for C{job_id}, or behaviour is undefined
@type job_id: string
@param job_id: Job ID
"""
assert ht.TString(job_id)
- jobs = self._waiters.pop(job_id, None)
+ self._lock.acquire()
+ try:
+ self._RemoveEmptyWaitersUnlocked()
+
+ jobs = self._waiters.pop(job_id, None)
+ finally:
+ self._lock.release()
+
if jobs:
# Re-add jobs to workerpool
logging.debug("Re-adding %s jobs which were waiting for job %s",
len(jobs), job_id)
self._enqueue_fn(jobs)
- # Remove all jobs without actual waiters
- for job_id in [job_id for (job_id, waiters) in self._waiters.items()
- if not waiters]:
- del self._waiters[job_id]
-
def _RequireOpenQueue(fn):
"""Decorator for "public" functions.
"""
def wrapper(self, *args, **kwargs):
- # pylint: disable-msg=W0212
+ # pylint: disable=W0212
assert self._queue_filelock is not None, "Queue should be open"
return fn(self, *args, **kwargs)
return wrapper
-class JobQueue(object):
- """Queue used to manage the jobs.
+def _RequireNonDrainedQueue(fn):
+ """Decorator checking for a non-drained queue.
- @cvar _RE_JOB_FILE: regex matching the valid job file names
+ To be used with functions submitting new jobs.
"""
- _RE_JOB_FILE = re.compile(r"^job-(%s)$" % constants.JOB_ID_TEMPLATE)
+ def wrapper(self, *args, **kwargs):
+ """Wrapper function.
+
+ @raise errors.JobQueueDrainError: if the job queue is marked for draining
+
+ """
+ # Ok when sharing the big job queue lock, as the drain file is created when
+ # the lock is exclusive.
+ # Needs access to protected member, pylint: disable=W0212
+ if self._drained:
+ raise errors.JobQueueDrainError("Job queue is drained, refusing job")
+
+ if not self._accepting_jobs:
+ raise errors.JobQueueError("Job queue is shutting down, refusing job")
+
+ return fn(self, *args, **kwargs)
+ return wrapper
+
+class JobQueue(object):
+ """Queue used to manage the jobs.
+
+ """
def __init__(self, context):
"""Constructor for JobQueue.
self.acquire = self._lock.acquire
self.release = self._lock.release
+ # Accept jobs by default
+ self._accepting_jobs = True
+
# Initialize the queue, and acquire the filelock.
# This ensures no other process is working on the job queue.
self._queue_filelock = jstore.InitAndVerifyQueue(must_lock=True)
# TODO: Check consistency across nodes
- self._queue_size = 0
+ self._queue_size = None
self._UpdateQueueSizeUnlocked()
+ assert ht.TInt(self._queue_size)
self._drained = jstore.CheckDrainFlag()
# Job dependencies
self.depmgr = _JobDependencyManager(self._GetJobStatusForDependencies,
self._EnqueueJobs)
+ self.context.glm.AddToLockMonitor(self.depmgr)
# Setup worker pool
self._wpool = _JobQueueWorkerPool(self)
restartjobs.append(job)
elif status in (constants.JOB_STATUS_RUNNING,
- constants.JOB_STATUS_WAITLOCK,
+ constants.JOB_STATUS_WAITING,
constants.JOB_STATUS_CANCELING):
logging.warning("Unfinished job %s found: %s", job.id, job)
- if status == constants.JOB_STATUS_WAITLOCK:
+ if status == constants.JOB_STATUS_WAITING:
# Restart job
job.MarkUnfinishedOps(constants.OP_STATUS_QUEUED, None)
restartjobs.append(job)
if restartjobs:
logging.info("Restarting %s jobs", len(restartjobs))
- self._EnqueueJobs(restartjobs)
+ self._EnqueueJobsUnlocked(restartjobs)
logging.info("Job queue inspection finished")
+ def _GetRpc(self, address_list):
+ """Gets RPC runner with context.
+
+ """
+ return rpc.JobQueueRunner(self.context, address_list)
+
@locking.ssynchronized(_LOCK)
@_RequireOpenQueue
def AddNode(self, node):
assert node_name != self._my_hostname
# Clean queue directory on added node
- result = rpc.RpcRunner.call_jobqueue_purge(node_name)
+ result = self._GetRpc(None).call_jobqueue_purge(node_name)
msg = result.fail_msg
if msg:
logging.warning("Cannot cleanup queue directory on node %s: %s",
# Upload current serial file
files.append(constants.JOB_QUEUE_SERIAL_FILE)
+ # Static address list
+ addrs = [node.primary_ip]
+
for file_name in files:
# Read file content
content = utils.ReadFile(file_name)
- result = rpc.RpcRunner.call_jobqueue_update([node_name],
- [node.primary_ip],
- file_name, content)
+ result = self._GetRpc(addrs).call_jobqueue_update([node_name], file_name,
+ content)
msg = result[node_name].fail_msg
if msg:
logging.error("Failed to upload file %s to node %s: %s",
if replicate:
names, addrs = self._GetNodeIp()
- result = rpc.RpcRunner.call_jobqueue_update(names, addrs, file_name, data)
+ result = self._GetRpc(addrs).call_jobqueue_update(names, file_name, data)
self._CheckRpcResult(result, self._nodes, "Updating %s" % file_name)
def _RenameFilesUnlocked(self, rename):
# ... and on all nodes
names, addrs = self._GetNodeIp()
- result = rpc.RpcRunner.call_jobqueue_rename(names, addrs, rename)
+ result = self._GetRpc(addrs).call_jobqueue_rename(names, rename)
self._CheckRpcResult(result, self._nodes, "Renaming files (%r)" % rename)
@staticmethod
@return: a string representing the job identifier.
"""
- assert count > 0
+ assert ht.TPositiveInt(count)
+
# New number
serial = self._last_serial + count
return utils.PathJoin(constants.JOB_QUEUE_ARCHIVE_DIR,
cls._GetArchiveDirectory(job_id), "job-%s" % job_id)
- def _GetJobIDsUnlocked(self, sort=True):
+ @staticmethod
+ def _GetJobIDsUnlocked(sort=True):
"""Return all known job IDs.
The method only looks at disk because it's a requirement that all
"""
jlist = []
for filename in utils.ListVisibleFiles(constants.QUEUE_DIR):
- m = self._RE_JOB_FILE.match(filename)
+ m = constants.JOB_FILE_RE.match(filename)
if m:
jlist.append(m.group(1))
if sort:
try:
data = serializer.LoadJson(raw_data)
job = _QueuedJob.Restore(self, data, writable)
- except Exception, err: # pylint: disable-msg=W0703
+ except Exception, err: # pylint: disable=W0703
raise errors.JobFileCorrupted(err)
return job
@param ops: The list of OpCodes that will become the new job.
@rtype: L{_QueuedJob}
@return: the job object to be queued
- @raise errors.JobQueueDrainError: if the job queue is marked for draining
@raise errors.JobQueueFull: if the job queue has too many jobs in it
@raise errors.GenericError: If an opcode is not valid
"""
- # Ok when sharing the big job queue lock, as the drain file is created when
- # the lock is exclusive.
- if self._drained:
- raise errors.JobQueueDrainError("Job queue is drained, refusing job")
-
if self._queue_size >= constants.JOB_QUEUE_SIZE_HARD_LIMIT:
raise errors.JobQueueFull()
raise errors.GenericError("Opcode %s has invalid priority %s, allowed"
" are %s" % (idx, op.priority, allowed))
+ dependencies = getattr(op.input, opcodes.DEPEND_ATTR, None)
+ if not opcodes.TNoRelativeJobDependencies(dependencies):
+ raise errors.GenericError("Opcode %s has invalid dependencies, must"
+ " match %s: %s" %
+ (idx, opcodes.TNoRelativeJobDependencies,
+ dependencies))
+
# Write to disk
self.UpdateJobUnlocked(job)
@locking.ssynchronized(_LOCK)
@_RequireOpenQueue
+ @_RequireNonDrainedQueue
def SubmitJob(self, ops):
"""Create and store a new job.
@see: L{_SubmitJobUnlocked}
"""
- job_id = self._NewSerialsUnlocked(1)[0]
- self._EnqueueJobs([self._SubmitJobUnlocked(job_id, ops)])
+ (job_id, ) = self._NewSerialsUnlocked(1)
+ self._EnqueueJobsUnlocked([self._SubmitJobUnlocked(job_id, ops)])
return job_id
@locking.ssynchronized(_LOCK)
@_RequireOpenQueue
+ @_RequireNonDrainedQueue
def SubmitManyJobs(self, jobs):
"""Create and store multiple jobs.
@see: L{_SubmitJobUnlocked}
"""
- results = []
- added_jobs = []
all_job_ids = self._NewSerialsUnlocked(len(jobs))
- for job_id, ops in zip(all_job_ids, jobs):
- try:
- added_jobs.append(self._SubmitJobUnlocked(job_id, ops))
- status = True
- data = job_id
- except errors.GenericError, err:
- data = ("%s; opcodes %s" %
- (err, utils.CommaJoin(op.Summary() for op in ops)))
- status = False
- results.append((status, data))
- self._EnqueueJobs(added_jobs)
+ (results, added_jobs) = \
+ self._SubmitManyJobsUnlocked(jobs, all_job_ids, [])
+
+ self._EnqueueJobsUnlocked(added_jobs)
return results
+ @staticmethod
+ def _FormatSubmitError(msg, ops):
+ """Formats errors which occurred while submitting a job.
+
+ """
+ return ("%s; opcodes %s" %
+ (msg, utils.CommaJoin(op.Summary() for op in ops)))
+
+ @staticmethod
+ def _ResolveJobDependencies(resolve_fn, deps):
+ """Resolves relative job IDs in dependencies.
+
+ @type resolve_fn: callable
+ @param resolve_fn: Function to resolve a relative job ID
+ @type deps: list
+ @param deps: Dependencies
+ @rtype: list
+ @return: Resolved dependencies
+
+ """
+ result = []
+
+ for (dep_job_id, dep_status) in deps:
+ if ht.TRelativeJobId(dep_job_id):
+ assert ht.TInt(dep_job_id) and dep_job_id < 0
+ try:
+ job_id = resolve_fn(dep_job_id)
+ except IndexError:
+ # Abort
+ return (False, "Unable to resolve relative job ID %s" % dep_job_id)
+ else:
+ job_id = dep_job_id
+
+ result.append((job_id, dep_status))
+
+ return (True, result)
+
+ def _SubmitManyJobsUnlocked(self, jobs, job_ids, previous_job_ids):
+ """Create and store multiple jobs.
+
+ @see: L{_SubmitJobUnlocked}
+
+ """
+ results = []
+ added_jobs = []
+
+ def resolve_fn(job_idx, reljobid):
+ assert reljobid < 0
+ return (previous_job_ids + job_ids[:job_idx])[reljobid]
+
+ for (idx, (job_id, ops)) in enumerate(zip(job_ids, jobs)):
+ for op in ops:
+ if getattr(op, opcodes.DEPEND_ATTR, None):
+ (status, data) = \
+ self._ResolveJobDependencies(compat.partial(resolve_fn, idx),
+ op.depends)
+ if not status:
+ # Abort resolving dependencies
+ assert ht.TNonEmptyString(data), "No error message"
+ break
+ # Use resolved dependencies
+ op.depends = data
+ else:
+ try:
+ job = self._SubmitJobUnlocked(job_id, ops)
+ except errors.GenericError, err:
+ status = False
+ data = self._FormatSubmitError(str(err), ops)
+ else:
+ status = True
+ data = job_id
+ added_jobs.append(job)
+
+ results.append((status, data))
+
+ return (results, added_jobs)
+
+ @locking.ssynchronized(_LOCK)
def _EnqueueJobs(self, jobs):
"""Helper function to add jobs to worker pool's queue.
@param jobs: List of all jobs
"""
+ return self._EnqueueJobsUnlocked(jobs)
+
+ def _EnqueueJobsUnlocked(self, jobs):
+ """Helper function to add jobs to worker pool's queue.
+
+ @type jobs: list
+ @param jobs: List of all jobs
+
+ """
+ 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])
# Try to load from disk
job = self.SafeLoadJobFromDisk(job_id, True, writable=False)
- assert not job.writable, "Got writable job"
+ assert not job.writable, "Got writable job" # pylint: disable=E1101
if job:
return job.CalcStatus()
assert job.writable, "Can't update read-only job"
filename = self._GetJobPath(job.id)
- data = serializer.DumpJson(job.Serialize(), indent=False)
+ data = serializer.DumpJson(job.Serialize())
logging.debug("Writing job %s to %s", job.id, filename)
self._UpdateJobQueueFile(filename, data, replicate)
return jobs
@locking.ssynchronized(_LOCK)
+ def PrepareShutdown(self):
+ """Prepare to stop the job queue.
+
+ Disables execution of jobs in the workerpool and returns whether there are
+ any jobs currently running. If the latter is the case, the job queue is not
+ yet ready for shutdown. Once this function returns C{True} L{Shutdown} can
+ be called without interfering with any job. Queued and unfinished jobs will
+ be resumed next time.
+
+ Once this function has been called no new job submissions will be accepted
+ (see L{_RequireNonDrainedQueue}).
+
+ @rtype: bool
+ @return: Whether there are any running jobs
+
+ """
+ if self._accepting_jobs:
+ self._accepting_jobs = False
+
+ # Tell worker pool to stop processing pending tasks
+ self._wpool.SetActive(False)
+
+ return self._wpool.HasRunningTasks()
+
+ @locking.ssynchronized(_LOCK)
@_RequireOpenQueue
def Shutdown(self):
"""Stops the job queue.
projects / ganeti-local / blobdiff