#
#
-# Copyright (C) 2006, 2007 Google Inc.
+# Copyright (C) 2006, 2007, 2008 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
# 02110-1301, USA.
-"""Module implementing the job queue handling."""
+"""Module implementing the job queue handling.
+Locking: there's a single, large lock in the L{JobQueue} class. It's
+used by all other classes in this module.
+
+@var JOBQUEUE_THREADS: the number of worker threads we start for
+ processing jobs
+
+"""
+
+import os
+import logging
import threading
-import Queue
+import errno
+import re
+import time
+import weakref
+from ganeti import constants
+from ganeti import serializer
+from ganeti import workerpool
from ganeti import opcodes
from ganeti import errors
+from ganeti import mcpu
+from ganeti import utils
+from ganeti import jstore
+from ganeti import rpc
+
+
+JOBQUEUE_THREADS = 25
+JOBS_PER_ARCHIVE_DIRECTORY = 10000
+
+
+class CancelJob(Exception):
+ """Special exception to cancel a job.
+
+ """
+
+
+def TimeStampNow():
+ """Returns the current timestamp.
+
+ @rtype: tuple
+ @return: the current time in the (seconds, microseconds) format
+
+ """
+ return utils.SplitTime(time.time())
+
+
+class _QueuedOpCode(object):
+ """Encapsulates an opcode object.
+
+ @ivar log: holds the execution log and consists of tuples
+ of the form C{(log_serial, timestamp, level, message)}
+ @ivar input: the OpCode we encapsulate
+ @ivar status: the current status
+ @ivar result: the result of the LU execution
+ @ivar start_timestamp: timestamp for the start of the execution
+ @ivar stop_timestamp: timestamp for the end of the execution
+
+ """
+ __slots__ = ["input", "status", "result", "log",
+ "start_timestamp", "end_timestamp",
+ "__weakref__"]
+
+ def __init__(self, op):
+ """Constructor for the _QuededOpCode.
+
+ @type op: L{opcodes.OpCode}
+ @param op: the opcode we encapsulate
-class JobObject:
+ """
+ self.input = op
+ self.status = constants.OP_STATUS_QUEUED
+ self.result = None
+ self.log = []
+ self.start_timestamp = None
+ self.end_timestamp = None
+
+ @classmethod
+ def Restore(cls, state):
+ """Restore the _QueuedOpCode from the serialized form.
+
+ @type state: dict
+ @param state: the serialized state
+ @rtype: _QueuedOpCode
+ @return: a new _QueuedOpCode instance
+
+ """
+ obj = _QueuedOpCode.__new__(cls)
+ obj.input = opcodes.OpCode.LoadOpCode(state["input"])
+ obj.status = state["status"]
+ obj.result = state["result"]
+ obj.log = state["log"]
+ obj.start_timestamp = state.get("start_timestamp", None)
+ obj.end_timestamp = state.get("end_timestamp", None)
+ return obj
+
+ def Serialize(self):
+ """Serializes this _QueuedOpCode.
+
+ @rtype: dict
+ @return: the dictionary holding the serialized state
+
+ """
+ return {
+ "input": self.input.__getstate__(),
+ "status": self.status,
+ "result": self.result,
+ "log": self.log,
+ "start_timestamp": self.start_timestamp,
+ "end_timestamp": self.end_timestamp,
+ }
+
+
+class _QueuedJob(object):
"""In-memory job representation.
- This is what we use to track the user-submitted jobs (which are of
- class opcodes.Job).
+ This is what we use to track the user-submitted jobs. Locking must
+ be taken care of by users of this class.
+
+ @type queue: L{JobQueue}
+ @ivar queue: the parent queue
+ @ivar id: the job ID
+ @type ops: list
+ @ivar ops: the list of _QueuedOpCode that constitute the job
+ @type run_op_index: int
+ @ivar run_op_index: the currently executing opcode, or -1 if
+ we didn't yet start executing
+ @type log_serial: int
+ @ivar log_serial: holds the index for the next log entry
+ @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 change: a Condition variable we use for waiting for job changes
"""
- def __init__(self, jid, jdesc):
- self.data = jdesc
- jdesc.status = opcodes.Job.STATUS_PENDING
- jdesc.job_id = jid
- self.lock = threading.Lock()
-
- def SetStatus(self, status, result=None):
- self.lock.acquire()
- self.data.status = status
- if result is not None:
- self.data.result = result
- self.lock.release()
-
- def GetData(self):
- self.lock.acquire()
- #FIXME(iustin): make a deep copy of result
- result = self.data
- self.lock.release()
- return result
-
-
-class QueueManager:
- """Example queue implementation.
+ __slots__ = ["queue", "id", "ops", "run_op_index", "log_serial",
+ "received_timestamp", "start_timestamp", "end_timestamp",
+ "change",
+ "__weakref__"]
+
+ def __init__(self, queue, job_id, ops):
+ """Constructor for the _QueuedJob.
+
+ @type queue: L{JobQueue}
+ @param queue: our parent queue
+ @type job_id: job_id
+ @param job_id: our job id
+ @type ops: list
+ @param ops: the list of opcodes we hold, which will be encapsulated
+ in _QueuedOpCodes
+
+ """
+ if not ops:
+ # TODO: use a better exception
+ raise Exception("No opcodes")
+
+ self.queue = queue
+ self.id = job_id
+ self.ops = [_QueuedOpCode(op) for op in ops]
+ self.run_op_index = -1
+ self.log_serial = 0
+ self.received_timestamp = TimeStampNow()
+ self.start_timestamp = None
+ self.end_timestamp = None
+
+ # Condition to wait for changes
+ self.change = threading.Condition(self.queue._lock)
+
+ @classmethod
+ def Restore(cls, queue, state):
+ """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
+ @rtype: _JobQueue
+ @return: the restored _JobQueue instance
+
+ """
+ obj = _QueuedJob.__new__(cls)
+ obj.queue = queue
+ obj.id = state["id"]
+ obj.run_op_index = state["run_op_index"]
+ obj.received_timestamp = state.get("received_timestamp", None)
+ obj.start_timestamp = state.get("start_timestamp", None)
+ obj.end_timestamp = state.get("end_timestamp", None)
+
+ obj.ops = []
+ obj.log_serial = 0
+ for op_state in state["ops"]:
+ op = _QueuedOpCode.Restore(op_state)
+ for log_entry in op.log:
+ obj.log_serial = max(obj.log_serial, log_entry[0])
+ obj.ops.append(op)
+
+ # Condition to wait for changes
+ obj.change = threading.Condition(obj.queue._lock)
+
+ return obj
+
+ def Serialize(self):
+ """Serialize the _JobQueue instance.
+
+ @rtype: dict
+ @return: the serialized state
+
+ """
+ return {
+ "id": self.id,
+ "ops": [op.Serialize() for op in self.ops],
+ "run_op_index": self.run_op_index,
+ "start_timestamp": self.start_timestamp,
+ "end_timestamp": self.end_timestamp,
+ "received_timestamp": self.received_timestamp,
+ }
+
+ def CalcStatus(self):
+ """Compute the status of this job.
+
+ This function iterates over all the _QueuedOpCodes in the job and
+ based on their status, computes the job status.
+
+ The algorithm is:
+ - if we find a cancelled, or finished with error, the job
+ status will be the same
+ - otherwise, the last opcode with the status one of:
+ - waitlock
+ - canceling
+ - running
+
+ will determine the job status
+
+ - otherwise, it means either all opcodes are queued, or success,
+ and the job status will be the same
+
+ @return: the job status
+
+ """
+ status = constants.JOB_STATUS_QUEUED
+
+ all_success = True
+ for op in self.ops:
+ if op.status == constants.OP_STATUS_SUCCESS:
+ continue
+
+ all_success = False
+
+ 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_RUNNING:
+ status = constants.JOB_STATUS_RUNNING
+ elif op.status == constants.OP_STATUS_CANCELING:
+ status = constants.JOB_STATUS_CANCELING
+ break
+ elif op.status == constants.OP_STATUS_ERROR:
+ status = constants.JOB_STATUS_ERROR
+ # The whole job fails if one opcode failed
+ break
+ elif op.status == constants.OP_STATUS_CANCELED:
+ status = constants.OP_STATUS_CANCELED
+ break
+
+ if all_success:
+ status = constants.JOB_STATUS_SUCCESS
+
+ return status
+
+ def GetLogEntries(self, newer_than):
+ """Selectively returns the log entries.
+
+ @type newer_than: None or int
+ @param newer_than: if this is None, return all log entries,
+ otherwise return only the log entries with serial higher
+ than this value
+ @rtype: list
+ @return: the list of the log entries selected
+
+ """
+ if newer_than is None:
+ serial = -1
+ else:
+ serial = newer_than
+
+ entries = []
+ for op in self.ops:
+ entries.extend(filter(lambda entry: entry[0] > serial, op.log))
+
+ return entries
+
+
+class _JobQueueWorker(workerpool.BaseWorker):
+ """The actual job workers.
"""
- def __init__(self):
- self.job_queue = {}
- self.jid = 1
- self.lock = threading.Lock()
- self.new_queue = Queue.Queue()
+ def _NotifyStart(self):
+ """Mark the opcode as running, not lock-waiting.
- def put(self, item):
- """Add a new job to the queue.
+ 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.
- This enters the job into our job queue and also puts it on the new
- queue, in order for it to be picked up by the queue processors.
+ """
+ assert self.queue, "Queue attribute is missing"
+ assert self.opcode, "Opcode attribute is missing"
+
+ self.queue.acquire()
+ try:
+ assert self.opcode.status in (constants.OP_STATUS_WAITLOCK,
+ constants.OP_STATUS_CANCELING)
+
+ # Cancel here if we were asked to
+ if self.opcode.status == constants.OP_STATUS_CANCELING:
+ raise CancelJob()
+
+ self.opcode.status = constants.OP_STATUS_RUNNING
+ finally:
+ self.queue.release()
+
+ def RunTask(self, job):
+ """Job executor.
+
+ This functions processes a job. It is closely tied to the _QueuedJob and
+ _QueuedOpCode classes.
+
+ @type job: L{_QueuedJob}
+ @param job: the job to be processed
+
+ """
+ logging.info("Worker %s processing job %s",
+ self.worker_id, job.id)
+ proc = mcpu.Processor(self.pool.queue.context)
+ self.queue = queue = job.queue
+ try:
+ try:
+ count = len(job.ops)
+ for idx, op in enumerate(job.ops):
+ op_summary = op.input.Summary()
+ if op.status == constants.OP_STATUS_SUCCESS:
+ # 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("Op %s/%s: opcode %s already processed, skipping",
+ idx + 1, count, op_summary)
+ continue
+ try:
+ logging.info("Op %s/%s: Starting opcode %s", idx + 1, count,
+ op_summary)
+
+ queue.acquire()
+ try:
+ if op.status == constants.OP_STATUS_CANCELED:
+ raise CancelJob()
+ assert op.status == constants.OP_STATUS_QUEUED
+ job.run_op_index = idx
+ op.status = constants.OP_STATUS_WAITLOCK
+ op.result = None
+ op.start_timestamp = TimeStampNow()
+ if idx == 0: # first opcode
+ job.start_timestamp = op.start_timestamp
+ queue.UpdateJobUnlocked(job)
+
+ input_opcode = op.input
+ finally:
+ queue.release()
+
+ def _Log(*args):
+ """Append a log entry.
+
+ """
+ assert len(args) < 3
+
+ if len(args) == 1:
+ log_type = constants.ELOG_MESSAGE
+ log_msg = args[0]
+ else:
+ log_type, log_msg = args
+
+ # The time is split to make serialization easier and not lose
+ # precision.
+ timestamp = utils.SplitTime(time.time())
+
+ queue.acquire()
+ try:
+ job.log_serial += 1
+ op.log.append((job.log_serial, timestamp, log_type, log_msg))
+
+ job.change.notifyAll()
+ finally:
+ queue.release()
+
+ # Make sure not to hold lock while _Log is called
+ self.opcode = op
+ result = proc.ExecOpCode(input_opcode, _Log, self._NotifyStart)
+
+ queue.acquire()
+ try:
+ op.status = constants.OP_STATUS_SUCCESS
+ op.result = result
+ op.end_timestamp = TimeStampNow()
+ queue.UpdateJobUnlocked(job)
+ finally:
+ queue.release()
+
+ logging.info("Op %s/%s: Successfully finished opcode %s",
+ idx + 1, count, op_summary)
+ except CancelJob:
+ # Will be handled further up
+ raise
+ except Exception, err:
+ queue.acquire()
+ try:
+ try:
+ op.status = constants.OP_STATUS_ERROR
+ op.result = str(err)
+ op.end_timestamp = TimeStampNow()
+ logging.info("Op %s/%s: Error in opcode %s: %s",
+ idx + 1, count, op_summary, err)
+ finally:
+ queue.UpdateJobUnlocked(job)
+ finally:
+ queue.release()
+ raise
+
+ except CancelJob:
+ queue.acquire()
+ try:
+ queue.CancelJobUnlocked(job)
+ finally:
+ queue.release()
+ except errors.GenericError, err:
+ logging.exception("Ganeti exception")
+ except:
+ logging.exception("Unhandled exception")
+ finally:
+ queue.acquire()
+ try:
+ try:
+ job.run_op_index = -1
+ job.end_timestamp = TimeStampNow()
+ queue.UpdateJobUnlocked(job)
+ finally:
+ job_id = job.id
+ status = job.CalcStatus()
+ finally:
+ queue.release()
+ logging.info("Worker %s finished job %s, status = %s",
+ self.worker_id, job_id, status)
+
+
+class _JobQueueWorkerPool(workerpool.WorkerPool):
+ """Simple class implementing a job-processing workerpool.
+
+ """
+ def __init__(self, queue):
+ super(_JobQueueWorkerPool, self).__init__(JOBQUEUE_THREADS,
+ _JobQueueWorker)
+ self.queue = queue
+
+
+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 _RequireOpenQueue(fn):
+ """Decorator for "public" functions.
+
+ This function should be used for all 'public' functions. That is,
+ functions usually called from other classes.
+
+ @warning: Use this decorator only after utils.LockedMethod!
+
+ Example::
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def Example(self):
+ pass
+
+ """
+ def wrapper(self, *args, **kwargs):
+ assert self._queue_lock is not None, "Queue should be open"
+ return fn(self, *args, **kwargs)
+ return wrapper
+
+ def __init__(self, context):
+ """Constructor for JobQueue.
+
+ The constructor will initialize the job queue object and then
+ start loading the current jobs from disk, either for starting them
+ (if they were queue) or for aborting them (if they were already
+ running).
+
+ @type context: GanetiContext
+ @param context: the context object for access to the configuration
+ data and other ganeti objects
+
+ """
+ self.context = context
+ self._memcache = weakref.WeakValueDictionary()
+ self._my_hostname = utils.HostInfo().name
+
+ # Locking
+ self._lock = threading.Lock()
+ self.acquire = self._lock.acquire
+ self.release = self._lock.release
+
+ # Initialize
+ self._queue_lock = jstore.InitAndVerifyQueue(must_lock=True)
+
+ # Read serial file
+ self._last_serial = jstore.ReadSerial()
+ assert self._last_serial is not None, ("Serial file was modified between"
+ " check in jstore and here")
+
+ # Get initial list of nodes
+ self._nodes = dict((n.name, n.primary_ip)
+ for n in self.context.cfg.GetAllNodesInfo().values()
+ if n.master_candidate)
+
+ # Remove master node
+ try:
+ del self._nodes[self._my_hostname]
+ except KeyError:
+ pass
+
+ # TODO: Check consistency across nodes
+
+ # Setup worker pool
+ self._wpool = _JobQueueWorkerPool(self)
+ try:
+ # We need to lock here because WorkerPool.AddTask() may start a job while
+ # we're still doing our work.
+ self.acquire()
+ try:
+ logging.info("Inspecting job queue")
+
+ all_job_ids = self._GetJobIDsUnlocked()
+ jobs_count = len(all_job_ids)
+ lastinfo = time.time()
+ for idx, job_id in enumerate(all_job_ids):
+ # Give an update every 1000 jobs or 10 seconds
+ if (idx % 1000 == 0 or time.time() >= (lastinfo + 10.0) or
+ idx == (jobs_count - 1)):
+ logging.info("Job queue inspection: %d/%d (%0.1f %%)",
+ idx, jobs_count - 1, 100.0 * (idx + 1) / jobs_count)
+ lastinfo = time.time()
+
+ job = self._LoadJobUnlocked(job_id)
+
+ # a failure in loading the job can cause 'None' to be returned
+ if job is None:
+ continue
+
+ status = job.CalcStatus()
+
+ if status in (constants.JOB_STATUS_QUEUED, ):
+ self._wpool.AddTask(job)
+
+ elif status in (constants.JOB_STATUS_RUNNING,
+ constants.JOB_STATUS_WAITLOCK,
+ constants.JOB_STATUS_CANCELING):
+ logging.warning("Unfinished job %s found: %s", job.id, job)
+ try:
+ for op in job.ops:
+ op.status = constants.OP_STATUS_ERROR
+ op.result = "Unclean master daemon shutdown"
+ finally:
+ self.UpdateJobUnlocked(job)
+
+ logging.info("Job queue inspection finished")
+ finally:
+ self.release()
+ except:
+ self._wpool.TerminateWorkers()
+ raise
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def AddNode(self, node):
+ """Register a new node with the queue.
+
+ @type node: L{objects.Node}
+ @param node: the node object to be added
+
+ """
+ node_name = node.name
+ assert node_name != self._my_hostname
+
+ # Clean queue directory on added node
+ rpc.RpcRunner.call_jobqueue_purge(node_name)
+
+ if not node.master_candidate:
+ # remove if existing, ignoring errors
+ self._nodes.pop(node_name, None)
+ # and skip the replication of the job ids
+ return
+
+ # Upload the whole queue excluding archived jobs
+ files = [self._GetJobPath(job_id) for job_id in self._GetJobIDsUnlocked()]
+
+ # Upload current serial file
+ files.append(constants.JOB_QUEUE_SERIAL_FILE)
+
+ for file_name in files:
+ # Read file content
+ fd = open(file_name, "r")
+ try:
+ content = fd.read()
+ finally:
+ fd.close()
+
+ result = rpc.RpcRunner.call_jobqueue_update([node_name],
+ [node.primary_ip],
+ file_name, content)
+ if not result[node_name]:
+ logging.error("Failed to upload %s to %s", file_name, node_name)
+
+ self._nodes[node_name] = node.primary_ip
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def RemoveNode(self, node_name):
+ """Callback called when removing nodes from the cluster.
+
+ @type node_name: str
+ @param node_name: the name of the node to remove
+
+ """
+ try:
+ # The queue is removed by the "leave node" RPC call.
+ del self._nodes[node_name]
+ except KeyError:
+ pass
+
+ def _CheckRpcResult(self, result, nodes, failmsg):
+ """Verifies the status of an RPC call.
+
+ Since we aim to keep consistency should this node (the current
+ master) fail, we will log errors if our rpc fail, and especially
+ log the case when more than half of the nodes fails.
+
+ @param result: the data as returned from the rpc call
+ @type nodes: list
+ @param nodes: the list of nodes we made the call to
+ @type failmsg: str
+ @param failmsg: the identifier to be used for logging
+
+ """
+ failed = []
+ success = []
+
+ for node in nodes:
+ if result[node]:
+ success.append(node)
+ else:
+ failed.append(node)
+
+ if failed:
+ logging.error("%s failed on %s", failmsg, ", ".join(failed))
+
+ # +1 for the master node
+ if (len(success) + 1) < len(failed):
+ # TODO: Handle failing nodes
+ logging.error("More than half of the nodes failed")
+
+ def _GetNodeIp(self):
+ """Helper for returning the node name/ip list.
+
+ @rtype: (list, list)
+ @return: a tuple of two lists, the first one with the node
+ names and the second one with the node addresses
+
+ """
+ name_list = self._nodes.keys()
+ addr_list = [self._nodes[name] for name in name_list]
+ return name_list, addr_list
+
+ def _WriteAndReplicateFileUnlocked(self, file_name, data):
+ """Writes a file locally and then replicates it to all nodes.
+
+ This function will replace the contents of a file on the local
+ node and then replicate it to all the other nodes we have.
+
+ @type file_name: str
+ @param file_name: the path of the file to be replicated
+ @type data: str
+ @param data: the new contents of the file
+
+ """
+ utils.WriteFile(file_name, data=data)
+
+ names, addrs = self._GetNodeIp()
+ result = rpc.RpcRunner.call_jobqueue_update(names, addrs, file_name, data)
+ self._CheckRpcResult(result, self._nodes,
+ "Updating %s" % file_name)
+
+ def _RenameFilesUnlocked(self, rename):
+ """Renames a file locally and then replicate the change.
+
+ This function will rename a file in the local queue directory
+ and then replicate this rename to all the other nodes we have.
+
+ @type rename: list of (old, new)
+ @param rename: List containing tuples mapping old to new names
+
+ """
+ # Rename them locally
+ for old, new in rename:
+ utils.RenameFile(old, new, mkdir=True)
+
+ # ... and on all nodes
+ names, addrs = self._GetNodeIp()
+ result = rpc.RpcRunner.call_jobqueue_rename(names, addrs, rename)
+ self._CheckRpcResult(result, self._nodes, "Renaming files (%r)" % rename)
+
+ def _FormatJobID(self, job_id):
+ """Convert a job ID to string format.
+
+ Currently this just does C{str(job_id)} after performing some
+ checks, but if we want to change the job id format this will
+ abstract this change.
+
+ @type job_id: int or long
+ @param job_id: the numeric job id
+ @rtype: str
+ @return: the formatted job id
+
+ """
+ if not isinstance(job_id, (int, long)):
+ raise errors.ProgrammerError("Job ID '%s' not numeric" % job_id)
+ if job_id < 0:
+ raise errors.ProgrammerError("Job ID %s is negative" % job_id)
+
+ return str(job_id)
+
+ @classmethod
+ def _GetArchiveDirectory(cls, job_id):
+ """Returns the archive directory for a job.
+
+ @type job_id: str
+ @param job_id: Job identifier
+ @rtype: str
+ @return: Directory name
+
+ """
+ return str(int(job_id) / JOBS_PER_ARCHIVE_DIRECTORY)
+
+ def _NewSerialUnlocked(self):
+ """Generates a new job identifier.
+
+ Job identifiers are unique during the lifetime of a cluster.
+
+ @rtype: str
+ @return: a string representing the job identifier.
+
+ """
+ # New number
+ serial = self._last_serial + 1
+
+ # Write to file
+ self._WriteAndReplicateFileUnlocked(constants.JOB_QUEUE_SERIAL_FILE,
+ "%s\n" % serial)
+
+ # Keep it only if we were able to write the file
+ self._last_serial = serial
+
+ return self._FormatJobID(serial)
+
+ @staticmethod
+ def _GetJobPath(job_id):
+ """Returns the job file for a given job id.
+
+ @type job_id: str
+ @param job_id: the job identifier
+ @rtype: str
+ @return: the path to the job file
+
+ """
+ return os.path.join(constants.QUEUE_DIR, "job-%s" % job_id)
+
+ @classmethod
+ def _GetArchivedJobPath(cls, job_id):
+ """Returns the archived job file for a give job id.
+
+ @type job_id: str
+ @param job_id: the job identifier
+ @rtype: str
+ @return: the path to the archived job file
+
+ """
+ path = "%s/job-%s" % (cls._GetArchiveDirectory(job_id), job_id)
+ return os.path.join(constants.JOB_QUEUE_ARCHIVE_DIR, path)
+
+ @classmethod
+ def _ExtractJobID(cls, name):
+ """Extract the job id from a filename.
+
+ @type name: str
+ @param name: the job filename
+ @rtype: job id or None
+ @return: the job id corresponding to the given filename,
+ or None if the filename does not represent a valid
+ job file
+
+ """
+ m = cls._RE_JOB_FILE.match(name)
+ if m:
+ return m.group(1)
+ else:
+ return None
+
+ def _GetJobIDsUnlocked(self, archived=False):
+ """Return all known job IDs.
+
+ If the parameter archived is True, archived jobs IDs will be
+ included. Currently this argument is unused.
+
+ The method only looks at disk because it's a requirement that all
+ jobs are present on disk (so in the _memcache we don't have any
+ extra IDs).
+
+ @rtype: list
+ @return: the list of job IDs
"""
- self.lock.acquire()
+ jlist = [self._ExtractJobID(name) for name in self._ListJobFiles()]
+ jlist = utils.NiceSort(jlist)
+ return jlist
+
+ def _ListJobFiles(self):
+ """Returns the list of current job files.
+
+ @rtype: list
+ @return: the list of job file names
+
+ """
+ return [name for name in utils.ListVisibleFiles(constants.QUEUE_DIR)
+ if self._RE_JOB_FILE.match(name)]
+
+ def _LoadJobUnlocked(self, job_id):
+ """Loads a job from the disk or memory.
+
+ Given a job id, this will return the cached job object if
+ existing, or try to load the job from the disk. If loading from
+ disk, it will also add the job to the cache.
+
+ @param job_id: the job id
+ @rtype: L{_QueuedJob} or None
+ @return: either None or the job object
+
+ """
+ job = self._memcache.get(job_id, None)
+ if job:
+ logging.debug("Found job %s in memcache", job_id)
+ return job
+
+ filepath = self._GetJobPath(job_id)
+ logging.debug("Loading job from %s", filepath)
+ try:
+ fd = open(filepath, "r")
+ except IOError, err:
+ if err.errno in (errno.ENOENT, ):
+ return None
+ raise
try:
- rid = self.jid
- self.jid += 1
- job = JobObject(rid, item)
- self.job_queue[rid] = job
+ data = serializer.LoadJson(fd.read())
finally:
- self.lock.release()
- self.new_queue.put(job)
- return rid
+ fd.close()
+
+ try:
+ job = _QueuedJob.Restore(self, data)
+ except Exception, err:
+ new_path = self._GetArchivedJobPath(job_id)
+ if filepath == new_path:
+ # job already archived (future case)
+ logging.exception("Can't parse job %s", job_id)
+ else:
+ # non-archived case
+ logging.exception("Can't parse job %s, will archive.", job_id)
+ self._RenameFilesUnlocked([(filepath, new_path)])
+ return None
+
+ self._memcache[job_id] = job
+ logging.debug("Added job %s to the cache", job_id)
+ return job
+
+ def _GetJobsUnlocked(self, job_ids):
+ """Return a list of jobs based on their IDs.
+
+ @type job_ids: list
+ @param job_ids: either an empty list (meaning all jobs),
+ or a list of job IDs
+ @rtype: list
+ @return: the list of job objects
+
+ """
+ if not job_ids:
+ job_ids = self._GetJobIDsUnlocked()
+
+ return [self._LoadJobUnlocked(job_id) for job_id in job_ids]
+
+ @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.
- def query(self, rid):
- """Query a given job ID.
+ @rtype: boolean
+ @return: True of the job queue is marked for draining
"""
- self.lock.acquire()
- result = self.job_queue.get(rid, None)
- self.lock.release()
- return result
+ return os.path.exists(constants.JOB_QUEUE_DRAIN_FILE)
- def query_jobs(self, fields, names):
- """Query all jobs.
+ @staticmethod
+ def SetDrainFlag(drain_flag):
+ """Sets the drain flag for the queue.
- The fields and names parameters are similar to the ones passed to
- the OpQueryInstances.
+ This is similar to the function L{backend.JobQueueSetDrainFlag},
+ and in the future we might merge them.
+
+ @type drain_flag: boolean
+ @param drain_flag: Whether to set or unset the drain flag
"""
- result = []
- self.lock.acquire()
- if names:
- values = [self.job_queue[j_id] for j_id in names]
+ if drain_flag:
+ utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True)
else:
- values = self.job_queue.itervalues()
+ utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE)
+ return True
+
+ @_RequireOpenQueue
+ def _SubmitJobUnlocked(self, ops):
+ """Create and store a new job.
+
+ This enters the job into our job queue and also puts it on the new
+ queue, in order for it to be picked up by the queue processors.
+
+ @type ops: list
+ @param ops: The list of OpCodes that will become the new job.
+ @rtype: job ID
+ @return: the job ID of the newly created job
+ @raise errors.JobQueueDrainError: if the job is marked for draining
+
+ """
+ if self._IsQueueMarkedDrain():
+ raise errors.JobQueueDrainError("Job queue is drained, refusing job")
+
+ # Check job queue size
+ size = len(self._ListJobFiles())
+ if size >= constants.JOB_QUEUE_SIZE_SOFT_LIMIT:
+ # TODO: Autoarchive jobs. Make sure it's not done on every job
+ # submission, though.
+ #size = ...
+ pass
+
+ if size >= constants.JOB_QUEUE_SIZE_HARD_LIMIT:
+ raise errors.JobQueueFull()
+
+ # Get job identifier
+ job_id = self._NewSerialUnlocked()
+ job = _QueuedJob(self, job_id, ops)
+
+ # Write to disk
+ self.UpdateJobUnlocked(job)
+
+ logging.debug("Adding new job %s to the cache", job_id)
+ self._memcache[job_id] = job
+
+ # Add to worker pool
+ self._wpool.AddTask(job)
+
+ return job.id
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def SubmitJob(self, ops):
+ """Create and store a new job.
+
+ @see: L{_SubmitJobUnlocked}
+
+ """
+ return self._SubmitJobUnlocked(ops)
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def SubmitManyJobs(self, jobs):
+ """Create and store multiple jobs.
+
+ @see: L{_SubmitJobUnlocked}
+
+ """
+ results = []
+ for ops in jobs:
+ try:
+ data = self._SubmitJobUnlocked(ops)
+ status = True
+ except errors.GenericError, err:
+ data = str(err)
+ status = False
+ results.append((status, data))
+
+ return results
+
+
+ @_RequireOpenQueue
+ def UpdateJobUnlocked(self, job):
+ """Update a job's on disk storage.
+
+ After a job has been modified, this function needs to be called in
+ order to write the changes to disk and replicate them to the other
+ nodes.
+
+ @type job: L{_QueuedJob}
+ @param job: the changed job
+
+ """
+ filename = self._GetJobPath(job.id)
+ data = serializer.DumpJson(job.Serialize(), indent=False)
+ logging.debug("Writing job %s to %s", job.id, filename)
+ self._WriteAndReplicateFileUnlocked(filename, data)
+
+ # Notify waiters about potential changes
+ job.change.notifyAll()
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def WaitForJobChanges(self, job_id, fields, prev_job_info, prev_log_serial,
+ timeout):
+ """Waits for changes in a job.
+
+ @type job_id: string
+ @param job_id: Job identifier
+ @type fields: list of strings
+ @param fields: Which fields to check for changes
+ @type prev_job_info: list or None
+ @param prev_job_info: Last job information returned
+ @type prev_log_serial: int
+ @param prev_log_serial: Last job message serial number
+ @type timeout: float
+ @param timeout: maximum time to wait
+ @rtype: tuple (job info, log entries)
+ @return: a tuple of the job information as required via
+ the fields parameter, and the log entries as a list
+
+ if the job has not changed and the timeout has expired,
+ we instead return a special value,
+ L{constants.JOB_NOTCHANGED}, which should be interpreted
+ as such by the clients
+
+ """
+ logging.debug("Waiting for changes in job %s", job_id)
+ end_time = time.time() + timeout
+ while True:
+ delta_time = end_time - time.time()
+ if delta_time < 0:
+ return constants.JOB_NOTCHANGED
+
+ job = self._LoadJobUnlocked(job_id)
+ if not job:
+ logging.debug("Job %s not found", job_id)
+ break
+
+ status = job.CalcStatus()
+ job_info = self._GetJobInfoUnlocked(job, fields)
+ log_entries = job.GetLogEntries(prev_log_serial)
+
+ # Serializing and deserializing data can cause type changes (e.g. from
+ # tuple to list) or precision loss. We're doing it here so that we get
+ # the same modifications as the data received from the client. Without
+ # this, the comparison afterwards might fail without the data being
+ # significantly different.
+ job_info = serializer.LoadJson(serializer.DumpJson(job_info))
+ log_entries = serializer.LoadJson(serializer.DumpJson(log_entries))
+
+ if status not in (constants.JOB_STATUS_QUEUED,
+ constants.JOB_STATUS_RUNNING,
+ constants.JOB_STATUS_WAITLOCK):
+ # Don't even try to wait if the job is no longer running, there will be
+ # no changes.
+ break
+
+ if (prev_job_info != job_info or
+ (log_entries and prev_log_serial != log_entries[0][0])):
+ break
+
+ logging.debug("Waiting again")
+
+ # Release the queue lock while waiting
+ job.change.wait(delta_time)
+
+ logging.debug("Job %s changed", job_id)
+
+ return (job_info, log_entries)
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def CancelJob(self, job_id):
+ """Cancels a job.
+
+ This will only succeed if the job has not started yet.
+
+ @type job_id: string
+ @param job_id: job ID of job to be cancelled.
+
+ """
+ logging.info("Cancelling job %s", job_id)
+
+ job = self._LoadJobUnlocked(job_id)
+ if not job:
+ logging.debug("Job %s not found", job_id)
+ return (False, "Job %s not found" % job_id)
+
+ job_status = job.CalcStatus()
+
+ if job_status not in (constants.JOB_STATUS_QUEUED,
+ constants.JOB_STATUS_WAITLOCK):
+ logging.debug("Job %s is no longer in the queue", job.id)
+ return (False, "Job %s is no longer in the queue" % job.id)
+
+ if job_status == constants.JOB_STATUS_QUEUED:
+ self.CancelJobUnlocked(job)
+ return (True, "Job %s canceled" % job.id)
+
+ elif job_status == constants.JOB_STATUS_WAITLOCK:
+ # The worker will notice the new status and cancel the job
+ try:
+ for op in job.ops:
+ op.status = constants.OP_STATUS_CANCELING
+ finally:
+ self.UpdateJobUnlocked(job)
+ return (True, "Job %s will be canceled" % job.id)
+
+ @_RequireOpenQueue
+ def CancelJobUnlocked(self, job):
+ """Marks a job as canceled.
+
+ """
try:
- for jobj in values:
- row = []
- jdata = jobj.data
- for fname in fields:
- if fname == "id":
- row.append(jdata.job_id)
- elif fname == "status":
- row.append(jdata.status)
- elif fname == "opcodes":
- row.append(",".join([op.OP_ID for op in jdata.op_list]))
- else:
- raise errors.OpExecError("Invalid job query field '%s'" %
- fname)
- result.append(row)
+ for op in job.ops:
+ op.status = constants.OP_STATUS_CANCELED
+ op.result = "Job canceled by request"
finally:
- self.lock.release()
- return result
+ self.UpdateJobUnlocked(job)
+
+ @_RequireOpenQueue
+ def _ArchiveJobsUnlocked(self, jobs):
+ """Archives jobs.
+
+ @type jobs: list of L{_QueuedJob}
+ @param jobs: Job objects
+ @rtype: int
+ @return: Number of archived jobs
+
+ """
+ archive_jobs = []
+ rename_files = []
+ for job in jobs:
+ if job.CalcStatus() not in (constants.JOB_STATUS_CANCELED,
+ constants.JOB_STATUS_SUCCESS,
+ constants.JOB_STATUS_ERROR):
+ logging.debug("Job %s is not yet done", job.id)
+ continue
+
+ archive_jobs.append(job)
+
+ old = self._GetJobPath(job.id)
+ new = self._GetArchivedJobPath(job.id)
+ rename_files.append((old, new))
+
+ # TODO: What if 1..n files fail to rename?
+ self._RenameFilesUnlocked(rename_files)
+
+ logging.debug("Successfully archived job(s) %s",
+ ", ".join(job.id for job in archive_jobs))
+
+ return len(archive_jobs)
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def ArchiveJob(self, job_id):
+ """Archives a job.
+
+ This is just a wrapper over L{_ArchiveJobsUnlocked}.
+
+ @type job_id: string
+ @param job_id: Job ID of job to be archived.
+ @rtype: bool
+ @return: Whether job was archived
+
+ """
+ logging.info("Archiving job %s", job_id)
+
+ job = self._LoadJobUnlocked(job_id)
+ if not job:
+ logging.debug("Job %s not found", job_id)
+ return False
+
+ return self._ArchiveJobsUnlocked([job]) == 1
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def AutoArchiveJobs(self, age, timeout):
+ """Archives all jobs based on age.
+
+ The method will archive all jobs which are older than the age
+ parameter. For jobs that don't have an end timestamp, the start
+ timestamp will be considered. The special '-1' age will cause
+ archival of all jobs (that are not running or queued).
+
+ @type age: int
+ @param age: the minimum age in seconds
+
+ """
+ logging.info("Archiving jobs with age more than %s seconds", age)
+
+ now = time.time()
+ end_time = now + timeout
+ archived_count = 0
+ last_touched = 0
+
+ all_job_ids = self._GetJobIDsUnlocked(archived=False)
+ pending = []
+ for idx, job_id in enumerate(all_job_ids):
+ last_touched = idx
+
+ # Not optimal because jobs could be pending
+ # TODO: Measure average duration for job archival and take number of
+ # pending jobs into account.
+ if time.time() > end_time:
+ break
+
+ # Returns None if the job failed to load
+ job = self._LoadJobUnlocked(job_id)
+ if job:
+ if job.end_timestamp is None:
+ if job.start_timestamp is None:
+ job_age = job.received_timestamp
+ else:
+ job_age = job.start_timestamp
+ else:
+ job_age = job.end_timestamp
+
+ if age == -1 or now - job_age[0] > age:
+ pending.append(job)
+
+ # Archive 10 jobs at a time
+ if len(pending) >= 10:
+ archived_count += self._ArchiveJobsUnlocked(pending)
+ pending = []
+
+ if pending:
+ archived_count += self._ArchiveJobsUnlocked(pending)
+
+ return (archived_count, len(all_job_ids) - last_touched - 1)
+
+ def _GetJobInfoUnlocked(self, job, fields):
+ """Returns information about a job.
+
+ @type job: L{_QueuedJob}
+ @param job: the job which we query
+ @type fields: list
+ @param fields: names of fields to return
+ @rtype: list
+ @return: list with one element for each field
+ @raise errors.OpExecError: when an invalid field
+ has been passed
+
+ """
+ row = []
+ for fname in fields:
+ if fname == "id":
+ row.append(job.id)
+ elif fname == "status":
+ row.append(job.CalcStatus())
+ elif fname == "ops":
+ row.append([op.input.__getstate__() for op in job.ops])
+ elif fname == "opresult":
+ row.append([op.result for op in job.ops])
+ elif fname == "opstatus":
+ row.append([op.status for op in job.ops])
+ elif fname == "oplog":
+ row.append([op.log for op in job.ops])
+ elif fname == "opstart":
+ row.append([op.start_timestamp for op in job.ops])
+ elif fname == "opend":
+ row.append([op.end_timestamp for op in job.ops])
+ elif fname == "received_ts":
+ row.append(job.received_timestamp)
+ elif fname == "start_ts":
+ row.append(job.start_timestamp)
+ elif fname == "end_ts":
+ row.append(job.end_timestamp)
+ elif fname == "summary":
+ row.append([op.input.Summary() for op in job.ops])
+ else:
+ raise errors.OpExecError("Invalid job query field '%s'" % fname)
+ return row
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def QueryJobs(self, job_ids, fields):
+ """Returns a list of jobs in queue.
+
+ This is a wrapper of L{_GetJobsUnlocked}, which actually does the
+ processing for each job.
+
+ @type job_ids: list
+ @param job_ids: sequence of job identifiers or None for all
+ @type fields: list
+ @param fields: names of fields to return
+ @rtype: list
+ @return: list one element per job, each element being list with
+ the requested fields
+
+ """
+ jobs = []
+
+ for job in self._GetJobsUnlocked(job_ids):
+ if job is None:
+ jobs.append(None)
+ else:
+ jobs.append(self._GetJobInfoUnlocked(job, fields))
+
+ return jobs
+
+ @utils.LockedMethod
+ @_RequireOpenQueue
+ def Shutdown(self):
+ """Stops the job queue.
+
+ This shutdowns all the worker threads an closes the queue.
+
+ """
+ self._wpool.TerminateWorkers()
+
+ self._queue_lock.Close()
+ self._queue_lock = None
projects / ganeti-local / blobdiff