#
#
-# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.
+# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
"""
-import os
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
from ganeti import runtime
from ganeti import netutils
from ganeti import compat
+from ganeti import ht
JOBQUEUE_THREADS = 25
@ivar received_timestamp: the timestamp for when the job was received
@ivar start_timestmap: the timestamp for start of execution
@ivar end_timestamp: the timestamp for end of execution
+ @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__"]
+ "__weakref__", "processor_lock", "writable"]
- def __init__(self, queue, job_id, ops):
+ def __init__(self, queue, job_id, ops, writable):
"""Constructor for the _QueuedJob.
@type queue: L{JobQueue}
@type ops: list
@param ops: the list of opcodes we hold, which will be encapsulated
in _QueuedOpCodes
+ @type writable: bool
+ @param writable: Whether job can be modified
"""
if not ops:
self.start_timestamp = None
self.end_timestamp = None
- self._InitInMemory(self)
+ self._InitInMemory(self, writable)
@staticmethod
- def _InitInMemory(obj):
+ def _InitInMemory(obj, writable):
"""Initializes in-memory variables.
"""
+ obj.writable = writable
obj.ops_iter = None
obj.cur_opctx = None
+ # 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__),
"id=%s" % self.id,
return "<%s at %#x>" % (" ".join(status), id(self))
@classmethod
- def Restore(cls, queue, state):
+ def Restore(cls, queue, state, writable):
"""Restore a _QueuedJob from serialized state:
@type queue: L{JobQueue}
@param queue: to which queue the restored job belongs
@type state: dict
@param state: the serialized state
+ @type writable: bool
+ @param writable: Whether job can be modified
@rtype: _JobQueue
@return: the restored _JobQueue instance
obj.log_serial = max(obj.log_serial, log_entry[0])
obj.ops.append(op)
- cls._InitInMemory(obj)
+ cls._InitInMemory(obj, writable)
return obj
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:
row.append(self.id)
elif fname == "status":
row.append(self.CalcStatus())
+ elif fname == "priority":
+ row.append(self.CalcPriority())
elif fname == "ops":
row.append([op.input.__getstate__() for op in self.ops])
elif fname == "opresult":
row.append([op.exec_timestamp for op in self.ops])
elif fname == "opend":
row.append([op.end_timestamp for op in self.ops])
+ elif fname == "oppriority":
+ row.append([op.priority for op in self.ops])
elif fname == "received_ts":
row.append(self.received_timestamp)
elif fname == "start_ts":
op.result = result
not_marked = False
+ def Finalize(self):
+ """Marks the job as finalized.
+
+ """
+ self.end_timestamp = TimeStampNow()
+
def Cancel(self):
"""Marks job as canceled/-ing if possible.
"""
status = self.CalcStatus()
- if status not in (constants.JOB_STATUS_QUEUED,
- constants.JOB_STATUS_WAITLOCK):
- 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)
-
if status == constants.JOB_STATUS_QUEUED:
self.MarkUnfinishedOps(constants.OP_STATUS_CANCELED,
"Job canceled by request")
- msg = "Job %s canceled" % self.id
+ 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)
- msg = "Job %s will be canceled" % self.id
+ return (True, "Job %s will be canceled" % self.id)
- return (True, msg)
+ else:
+ 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)
class _OpExecCallbacks(mcpu.OpExecCbBase):
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
self._CheckCancel()
+ def SubmitManyJobs(self, jobs):
+ """Submits jobs for processing.
+
+ See L{JobQueue.SubmitManyJobs}.
+
+ """
+ # Locking is done in job queue
+ return self._queue.SubmitManyJobs(jobs)
+
class _JobChangesChecker(object):
def __init__(self, fields, prev_job_info, prev_log_serial):
@param job: Job object
"""
+ assert not job.writable, "Expected read-only job"
+
status = job.CalcStatus()
job_info = job.GetInfo(self._fields)
log_entries = job.GetLogEntries(self._prev_log_serial)
# 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:
self.log_prefix = log_prefix
self.summary = op.input.Summary()
+ # Create local copy to modify
+ if getattr(op.input, opcodes.DEPEND_ATTR, None):
+ self.jobdeps = op.input.depends[:]
+ else:
+ self.jobdeps = None
+
self._timeout_strategy_factory = timeout_strategy_factory
self._ResetTimeoutStrategy()
class _JobProcessor(object):
+ (DEFER,
+ WAITDEP,
+ FINISHED) = range(1, 4)
+
def __init__(self, queue, opexec_fn, job,
_timeout_strategy_factory=mcpu.LockAttemptTimeoutStrategy):
"""Initializes this class.
opctx = _OpExecContext(op, idx, "Op %s/%s" % (idx + 1, len(job.ops)),
timeout_strategy_factory)
- if op.status == constants.OP_STATUS_CANCELED:
- # Cancelled jobs are handled by the caller
- assert not compat.any(i.status != constants.OP_STATUS_CANCELED
- for i in job.ops[idx:])
-
- elif op.status in constants.OPS_FINALIZED:
- # This is a job that was partially completed before master daemon
- # shutdown, so it can be expected that some opcodes are already
- # completed successfully (if any did error out, then the whole job
- # should have been aborted and not resubmitted for processing).
- logging.info("%s: opcode %s already processed, skipping",
- opctx.log_prefix, opctx.summary)
- continue
+ if op.status not in constants.OPS_FINALIZED:
+ return opctx
- return opctx
+ # This is a job that was partially completed before master daemon
+ # shutdown, so it can be expected that some opcodes are already
+ # completed successfully (if any did error out, then the whole job
+ # should have been aborted and not resubmitted for processing).
+ logging.info("%s: opcode %s already processed, skipping",
+ opctx.log_prefix, opctx.summary)
@staticmethod
def _MarkWaitlock(job, op):
@type job: L{_QueuedJob}
@param job: Job object
- @type job: L{_QueuedOpCode}
- @param job: Opcode object
+ @type op: L{_QueuedOpCode}
+ @param op: Opcode object
"""
assert op in job.ops
+ assert op.status in (constants.OP_STATUS_QUEUED,
+ constants.OP_STATUS_WAITING)
+
+ update = False
- op.status = constants.OP_STATUS_WAITLOCK
op.result = None
- op.start_timestamp = TimeStampNow()
+
+ if op.status == constants.OP_STATUS_QUEUED:
+ op.status = constants.OP_STATUS_WAITING
+ update = True
+
+ if op.start_timestamp is None:
+ op.start_timestamp = TimeStampNow()
+ update = True
if job.start_timestamp is None:
job.start_timestamp = op.start_timestamp
+ update = True
+
+ assert op.status == constants.OP_STATUS_WAITING
+
+ return update
+
+ @staticmethod
+ def _CheckDependencies(queue, job, opctx):
+ """Checks if an opcode has dependencies and if so, processes them.
+
+ @type queue: L{JobQueue}
+ @param queue: Queue object
+ @type job: L{_QueuedJob}
+ @param job: Job object
+ @type opctx: L{_OpExecContext}
+ @param opctx: Opcode execution context
+ @rtype: bool
+ @return: Whether opcode will be re-scheduled by dependency tracker
+
+ """
+ op = opctx.op
+
+ result = False
+
+ while opctx.jobdeps:
+ (dep_job_id, dep_status) = opctx.jobdeps[0]
+
+ (depresult, depmsg) = queue.depmgr.CheckAndRegister(job, dep_job_id,
+ dep_status)
+ assert ht.TNonEmptyString(depmsg), "No dependency message"
+
+ logging.info("%s: %s", opctx.log_prefix, depmsg)
+
+ if depresult == _JobDependencyManager.CONTINUE:
+ # Remove dependency and continue
+ opctx.jobdeps.pop(0)
+
+ elif depresult == _JobDependencyManager.WAIT:
+ # Need to wait for notification, dependency tracker will re-add job
+ # to workerpool
+ result = True
+ break
+
+ elif depresult == _JobDependencyManager.CANCEL:
+ # Job was cancelled, cancel this job as well
+ job.Cancel()
+ assert op.status == constants.OP_STATUS_CANCELING
+ break
+
+ elif depresult in (_JobDependencyManager.WRONGSTATUS,
+ _JobDependencyManager.ERROR):
+ # Job failed or there was an error, this job must fail
+ op.status = constants.OP_STATUS_ERROR
+ op.result = _EncodeOpError(errors.OpExecError(depmsg))
+ break
+
+ else:
+ raise errors.ProgrammerError("Unknown dependency result '%s'" %
+ depresult)
+
+ return result
def _ExecOpCodeUnlocked(self, opctx):
"""Processes one opcode and returns the result.
"""
op = opctx.op
- assert op.status == constants.OP_STATUS_WAITLOCK
+ assert op.status == constants.OP_STATUS_WAITING
timeout = opctx.GetNextLockTimeout()
# Make sure not to hold queue lock while calling ExecOpCode
result = self.opexec_fn(op.input,
_OpExecCallbacks(self.queue, self.job, op),
- timeout=timeout)
+ timeout=timeout, priority=op.priority)
except mcpu.LockAcquireTimeout:
assert timeout is not None, "Received timeout for blocking acquire"
logging.debug("Couldn't acquire locks in %0.6fs", timeout)
- assert op.status == constants.OP_STATUS_WAITLOCK
- return (constants.OP_STATUS_QUEUED, None)
+
+ assert op.status in (constants.OP_STATUS_WAITING,
+ constants.OP_STATUS_CANCELING)
+
+ # Was job cancelled while we were waiting for the lock?
+ if op.status == constants.OP_STATUS_CANCELING:
+ return (constants.OP_STATUS_CANCELING, 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 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
try:
opcount = len(job.ops)
+ assert job.writable, "Expected writable job"
+
+ # Don't do anything for finalized jobs
+ if job.CalcStatus() in constants.JOBS_FINALIZED:
+ return self.FINISHED
+
# Is a previous opcode still pending?
if job.cur_opctx:
opctx = job.cur_opctx
+ job.cur_opctx = None
else:
if __debug__ and _nextop_fn:
_nextop_fn()
# Consistency check
assert compat.all(i.status in (constants.OP_STATUS_QUEUED,
- constants.OP_STATUS_CANCELED)
- for i in job.ops[opctx.index:])
+ constants.OP_STATUS_CANCELING)
+ for i in job.ops[opctx.index + 1:])
assert op.status in (constants.OP_STATUS_QUEUED,
- constants.OP_STATUS_WAITLOCK,
- constants.OP_STATUS_CANCELED)
+ constants.OP_STATUS_WAITING,
+ constants.OP_STATUS_CANCELING)
assert (op.priority <= constants.OP_PRIO_LOWEST and
op.priority >= constants.OP_PRIO_HIGHEST)
- if op.status != constants.OP_STATUS_CANCELED:
+ waitjob = None
+
+ if op.status != constants.OP_STATUS_CANCELING:
+ assert op.status in (constants.OP_STATUS_QUEUED,
+ constants.OP_STATUS_WAITING)
+
# Prepare to start opcode
- self._MarkWaitlock(job, op)
+ 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
- # Write to disk
- queue.UpdateJobUnlocked(job)
+ # Check if waiting for a job is necessary
+ waitjob = self._CheckDependencies(queue, job, opctx)
- logging.info("%s: opcode %s waiting for locks",
- opctx.log_prefix, opctx.summary)
+ assert op.status in (constants.OP_STATUS_WAITING,
+ constants.OP_STATUS_CANCELING,
+ constants.OP_STATUS_ERROR)
- queue.release()
- try:
- (op_status, op_result) = self._ExecOpCodeUnlocked(opctx)
- finally:
- queue.acquire(shared=1)
+ if not (waitjob or op.status in (constants.OP_STATUS_CANCELING,
+ constants.OP_STATUS_ERROR)):
+ logging.info("%s: opcode %s waiting for locks",
+ opctx.log_prefix, opctx.summary)
- op.status = op_status
- op.result = op_result
+ assert not opctx.jobdeps, "Not all dependencies were removed"
- if op.status == constants.OP_STATUS_QUEUED:
+ queue.release()
+ try:
+ (op_status, op_result) = self._ExecOpCodeUnlocked(opctx)
+ finally:
+ queue.acquire(shared=1)
+
+ op.status = op_status
+ op.result = op_result
+
+ assert not waitjob
+
+ 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_QUEUED:
+ if op.status == constants.OP_STATUS_WAITING or waitjob:
finalize = False
- opctx.CheckPriorityIncrease()
+ if not waitjob and opctx.CheckPriorityIncrease():
+ # Priority was changed, need to update on-disk file
+ queue.UpdateJobUnlocked(job)
# Keep around for another round
job.cur_opctx = opctx
op.priority >= constants.OP_PRIO_HIGHEST)
# In no case must the status be finalized here
- assert job.CalcStatus() == constants.JOB_STATUS_QUEUED
-
- queue.UpdateJobUnlocked(job)
+ assert job.CalcStatus() == constants.JOB_STATUS_WAITING
else:
# Ensure all opcodes so far have been successful
"Job canceled by request")
finalize = True
- elif op.status == constants.OP_STATUS_CANCELED:
- finalize = True
-
else:
raise errors.ProgrammerError("Unknown status '%s'" % op.status)
- # Finalizing or last opcode?
- if finalize or opctx.index == (opcount - 1):
+ if opctx.index == (opcount - 1):
+ # Finalize on last opcode
+ finalize = True
+
+ if finalize:
# All opcodes have been run, finalize job
- job.end_timestamp = TimeStampNow()
+ job.Finalize()
# Write to disk. If the job status is final, this is the final write
# allowed. Once the file has been written, it can be archived anytime.
queue.UpdateJobUnlocked(job)
- if finalize or opctx.index == (opcount - 1):
+ assert not waitjob
+
+ if finalize:
logging.info("Finished job %s, status = %s", job.id, job.CalcStatus())
- return True
+ return self.FINISHED
- return False
+ assert not waitjob or queue.depmgr.JobWaiting(job)
+
+ if waitjob:
+ return self.WAITDEP
+ else:
+ return self.DEFER
finally:
+ assert job.writable, "Job became read-only while being processed"
queue.release()
"""The actual job workers.
"""
- def RunTask(self, job): # pylint: disable-msg=W0221
+ def RunTask(self, job): # pylint: disable=W0221
"""Job executor.
- This functions processes a job. It is closely tied to the L{_QueuedJob} and
- L{_QueuedOpCode} classes.
-
@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.
+ job.processor_lock.acquire()
+ try:
+ return self._RunTaskInner(job)
+ finally:
+ job.processor_lock.release()
+
+ def _RunTaskInner(self, job):
+ """Executes a job.
+
+ Must be called with per-job lock acquired.
+
+ """
queue = job.queue
assert queue == self.pool.queue
- self.SetTaskName("Job%s" % job.id)
+ setname_fn = lambda op: self.SetTaskName(self._GetWorkerName(job, op))
+ setname_fn(None)
proc = mcpu.Processor(queue.context, job.id)
- if not _JobProcessor(queue, proc.ExecOpCode, job)():
+ # Create wrapper for setting thread name
+ wrap_execop_fn = compat.partial(self._WrapExecOpCode, setname_fn,
+ proc.ExecOpCode)
+
+ result = _JobProcessor(queue, wrap_execop_fn, job)()
+
+ if result == _JobProcessor.FINISHED:
+ # Notify waiting jobs
+ queue.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, ))
+
+ @staticmethod
+ def _WrapExecOpCode(setname_fn, execop_fn, op, *args, **kwargs):
+ """Updates the worker thread name to include a short summary of the opcode.
+
+ @param setname_fn: Callable setting worker thread name
+ @param execop_fn: Callable for executing opcode (usually
+ L{mcpu.Processor.ExecOpCode})
+
+ """
+ setname_fn(op)
+ try:
+ return execop_fn(op, *args, **kwargs)
+ finally:
+ setname_fn(None)
+
+ @staticmethod
+ def _GetWorkerName(job, op):
+ """Sets the worker thread name.
+
+ @type job: L{_QueuedJob}
+ @type op: L{opcodes.OpCode}
+
+ """
+ parts = ["Job%s" % job.id]
+
+ if op:
+ parts.append(op.TinySummary())
+
+ return "/".join(parts)
+
class _JobQueueWorkerPool(workerpool.WorkerPool):
"""Simple class implementing a job-processing workerpool.
"""
def __init__(self, queue):
- super(_JobQueueWorkerPool, self).__init__("JobQueue",
+ super(_JobQueueWorkerPool, self).__init__("Jq",
JOBQUEUE_THREADS,
_JobQueueWorker)
self.queue = queue
+class _JobDependencyManager:
+ """Keeps track of job dependencies.
+
+ """
+ (WAIT,
+ ERROR,
+ CANCEL,
+ CONTINUE,
+ WRONGSTATUS) = range(1, 6)
+
+ def __init__(self, getstatus_fn, enqueue_fn):
+ """Initializes this class.
+
+ """
+ self._getstatus_fn = getstatus_fn
+ self._enqueue_fn = enqueue_fn
+
+ self._waiters = {}
+ 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.
+
+ """
+ return compat.any(job in jobs
+ for jobs in self._waiters.values())
+
+ @locking.ssynchronized(_LOCK)
+ def CheckAndRegister(self, job, dep_job_id, dep_status):
+ """Checks if a dependency job has the requested status.
+
+ If the other job is not yet in a finalized status, the calling job will be
+ notified (re-added to the workerpool) at a later point.
+
+ @type job: L{_QueuedJob}
+ @param job: Job object
+ @type dep_job_id: string
+ @param dep_job_id: ID of dependency job
+ @type dep_status: list
+ @param dep_status: Required status
+
+ """
+ assert ht.TString(job.id)
+ assert ht.TString(dep_job_id)
+ assert ht.TListOf(ht.TElemOf(constants.JOBS_FINALIZED))(dep_status)
+
+ if job.id == dep_job_id:
+ return (self.ERROR, "Job can't depend on itself")
+
+ # Get status of dependency job
+ try:
+ status = self._getstatus_fn(dep_job_id)
+ except errors.JobLost, err:
+ return (self.ERROR, "Dependency error: %s" % err)
+
+ assert status in constants.JOB_STATUS_ALL
+
+ job_id_waiters = self._waiters.setdefault(dep_job_id, set())
+
+ if status not in constants.JOBS_FINALIZED:
+ # Register for notification and wait for job to finish
+ job_id_waiters.add(job)
+ return (self.WAIT,
+ "Need to wait for job %s, wanted status '%s'" %
+ (dep_job_id, dep_status))
+
+ # Remove from waiters list
+ if job in job_id_waiters:
+ job_id_waiters.remove(job)
+
+ if (status == constants.JOB_STATUS_CANCELED and
+ constants.JOB_STATUS_CANCELED not in dep_status):
+ return (self.CANCEL, "Dependency job %s was cancelled" % dep_job_id)
+
+ elif not dep_status or status in dep_status:
+ return (self.CONTINUE,
+ "Dependency job %s finished with status '%s'" %
+ (dep_job_id, status))
+
+ else:
+ return (self.WRONGSTATUS,
+ "Dependency job %s finished with status '%s',"
+ " not one of '%s' as required" %
+ (dep_job_id, status, utils.CommaJoin(dep_status)))
+
+ @locking.ssynchronized(_LOCK)
+ def NotifyWaiters(self, job_id):
+ """Notifies all jobs waiting for a certain job ID.
+
+ @type job_id: string
+ @param job_id: Job ID
+
+ """
+ assert ht.TString(job_id)
+
+ jobs = self._waiters.pop(job_id, None)
+ 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.
- @cvar _RE_JOB_FILE: regex matching the valid job file names
-
"""
- _RE_JOB_FILE = re.compile(r"^job-(%s)$" % constants.JOB_ID_TEMPLATE)
-
def __init__(self, context):
"""Constructor for JobQueue.
self._queue_size = 0
self._UpdateQueueSizeUnlocked()
- self._drained = self._IsQueueMarkedDrain()
+ 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)
status = job.CalcStatus()
- if status in (constants.JOB_STATUS_QUEUED, ):
+ if status == constants.JOB_STATUS_QUEUED:
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)
- job.MarkUnfinishedOps(constants.OP_STATUS_ERROR,
- "Unclean master daemon shutdown")
+
+ if status == constants.JOB_STATUS_WAITING:
+ # Restart job
+ job.MarkUnfinishedOps(constants.OP_STATUS_QUEUED, None)
+ restartjobs.append(job)
+ else:
+ job.MarkUnfinishedOps(constants.OP_STATUS_ERROR,
+ "Unclean master daemon shutdown")
+ job.Finalize()
+
self.UpdateJobUnlocked(job)
if restartjobs:
logging.info("Restarting %s jobs", len(restartjobs))
- self._EnqueueJobs(restartjobs)
+ self._EnqueueJobsUnlocked(restartjobs)
logging.info("Job queue inspection finished")
@return: a string representing the job identifier.
"""
- assert count > 0
+ assert ht.TPositiveInt(count)
+
# New number
serial = self._last_serial + count
"%s\n" % serial, True)
result = [self._FormatJobID(v)
- for v in range(self._last_serial, serial + 1)]
+ for v in range(self._last_serial + 1, serial + 1)]
+
# Keep it only if we were able to write the file
self._last_serial = serial
+ assert len(result) == count
+
return result
@staticmethod
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:
job = self._memcache.get(job_id, None)
if job:
logging.debug("Found job %s in memcache", job_id)
+ assert job.writable, "Found read-only job in memcache"
return job
try:
- job = self._LoadJobFromDisk(job_id)
+ job = self._LoadJobFromDisk(job_id, False)
if job is None:
return job
except errors.JobFileCorrupted:
self._RenameFilesUnlocked([(old_path, new_path)])
return None
+ assert job.writable, "Job just loaded is not writable"
+
self._memcache[job_id] = job
logging.debug("Added job %s to the cache", job_id)
return job
- def _LoadJobFromDisk(self, job_id):
+ def _LoadJobFromDisk(self, job_id, try_archived, writable=None):
"""Load the given job file from disk.
Given a job file, read, load and restore it in a _QueuedJob format.
@type job_id: string
@param job_id: job identifier
+ @type try_archived: bool
+ @param try_archived: Whether to try loading an archived job
@rtype: L{_QueuedJob} or None
@return: either None or the job object
"""
- filepath = self._GetJobPath(job_id)
- logging.debug("Loading job from %s", filepath)
- try:
- raw_data = utils.ReadFile(filepath)
- except EnvironmentError, err:
- if err.errno in (errno.ENOENT, ):
- return None
- raise
+ path_functions = [(self._GetJobPath, True)]
+
+ if try_archived:
+ path_functions.append((self._GetArchivedJobPath, False))
+
+ raw_data = None
+ writable_default = None
+
+ for (fn, writable_default) in path_functions:
+ filepath = fn(job_id)
+ logging.debug("Loading job from %s", filepath)
+ try:
+ raw_data = utils.ReadFile(filepath)
+ except EnvironmentError, err:
+ if err.errno != errno.ENOENT:
+ raise
+ else:
+ break
+
+ if not raw_data:
+ return None
+
+ if writable is None:
+ writable = writable_default
try:
data = serializer.LoadJson(raw_data)
- job = _QueuedJob.Restore(self, data)
- except Exception, err: # pylint: disable-msg=W0703
+ job = _QueuedJob.Restore(self, data, writable)
+ except Exception, err: # pylint: disable=W0703
raise errors.JobFileCorrupted(err)
return job
- def SafeLoadJobFromDisk(self, job_id):
+ def SafeLoadJobFromDisk(self, job_id, try_archived, writable=None):
"""Load the given job file from disk.
Given a job file, read, load and restore it in a _QueuedJob format.
@type job_id: string
@param job_id: job identifier
+ @type try_archived: bool
+ @param try_archived: Whether to try loading an archived job
@rtype: L{_QueuedJob} or None
@return: either None or the job object
"""
try:
- return self._LoadJobFromDisk(job_id)
+ return self._LoadJobFromDisk(job_id, try_archived, writable=writable)
except (errors.JobFileCorrupted, EnvironmentError):
logging.exception("Can't load/parse job %s", job_id)
return None
- @staticmethod
- def _IsQueueMarkedDrain():
- """Check if the queue is marked from drain.
-
- This currently uses the queue drain file, which makes it a
- per-node flag. In the future this can be moved to the config file.
-
- @rtype: boolean
- @return: True of the job queue is marked for draining
-
- """
- return os.path.exists(constants.JOB_QUEUE_DRAIN_FILE)
-
def _UpdateQueueSizeUnlocked(self):
"""Update the queue size.
@param drain_flag: Whether to set or unset the drain flag
"""
- getents = runtime.GetEnts()
-
- if drain_flag:
- utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True,
- uid=getents.masterd_uid, gid=getents.masterd_gid)
- else:
- utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE)
+ jstore.SetDrainFlag(drain_flag)
self._drained = drain_flag
if self._queue_size >= constants.JOB_QUEUE_SIZE_HARD_LIMIT:
raise errors.JobQueueFull()
- job = _QueuedJob(self, job_id, ops)
+ job = _QueuedJob(self, job_id, ops, True)
# Check priority
for idx, op in enumerate(job.ops):
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)
@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)
@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 = str(err)
- 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])
+ def _GetJobStatusForDependencies(self, job_id):
+ """Gets the status of a job for dependencies.
+
+ @type job_id: string
+ @param job_id: Job ID
+ @raise errors.JobLost: If job can't be found
+
+ """
+ if not isinstance(job_id, basestring):
+ job_id = self._FormatJobID(job_id)
+
+ # Not using in-memory cache as doing so would require an exclusive lock
+
+ # Try to load from disk
+ job = self.SafeLoadJobFromDisk(job_id, True, writable=False)
+
+ assert not job.writable, "Got writable job" # pylint: disable=E1101
+
+ if job:
+ return job.CalcStatus()
+
+ raise errors.JobLost("Job %s not found" % job_id)
+
@_RequireOpenQueue
def UpdateJobUnlocked(self, job, replicate=True):
"""Update a job's on disk storage.
@param replicate: whether to replicate the change to remote nodes
"""
+ if __debug__:
+ finalized = job.CalcStatus() in constants.JOBS_FINALIZED
+ assert (finalized ^ (job.end_timestamp is None))
+ assert job.writable, "Can't update read-only job"
+
filename = self._GetJobPath(job.id)
data = serializer.DumpJson(job.Serialize(), indent=False)
logging.debug("Writing job %s to %s", job.id, filename)
as such by the clients
"""
- load_fn = compat.partial(self.SafeLoadJobFromDisk, job_id)
+ load_fn = compat.partial(self.SafeLoadJobFromDisk, job_id, False,
+ writable=False)
helper = _WaitForJobChangesHelper()
logging.debug("Job %s not found", job_id)
return (False, "Job %s not found" % job_id)
+ assert job.writable, "Can't cancel read-only job"
+
(success, msg) = job.Cancel()
if success:
+ # If the job was finalized (e.g. cancelled), this is the final write
+ # allowed. The job can be archived anytime.
self.UpdateJobUnlocked(job)
return (success, msg)
archive_jobs = []
rename_files = []
for job in jobs:
+ assert job.writable, "Can't archive read-only job"
+
if job.CalcStatus() not in constants.JOBS_FINALIZED:
logging.debug("Job %s is not yet done", job.id)
continue
list_all = True
for job_id in job_ids:
- job = self.SafeLoadJobFromDisk(job_id)
+ job = self.SafeLoadJobFromDisk(job_id, True)
if job is not None:
jobs.append(job.GetInfo(fields))
elif not list_all: