root / lib / jqueue.py @ 5bdce580
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module implementing the job queue handling."""
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import os |
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import logging |
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import threading |
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import errno |
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import re |
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import time |
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from ganeti import constants |
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from ganeti import serializer |
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from ganeti import workerpool |
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from ganeti import opcodes |
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from ganeti import errors |
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from ganeti import mcpu |
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from ganeti import utils |
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from ganeti import rpc |
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JOBQUEUE_THREADS = 5
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class _QueuedOpCode(object): |
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"""Encasulates an opcode object.
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Access is synchronized by the '_lock' attribute.
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The 'log' attribute holds the execution log and consists of tuples
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of the form (timestamp, level, message).
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"""
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def __new__(cls, *args, **kwargs): |
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obj = object.__new__(cls, *args, **kwargs)
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# Create a special lock for logging
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obj._log_lock = threading.Lock() |
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return obj
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def __init__(self, op): |
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self.input = op
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self.status = constants.OP_STATUS_QUEUED
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self.result = None |
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self.log = []
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@classmethod
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def Restore(cls, state): |
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obj = _QueuedOpCode.__new__(cls) |
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obj.input = opcodes.OpCode.LoadOpCode(state["input"])
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obj.status = state["status"]
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obj.result = state["result"]
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obj.log = state["log"]
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return obj
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def Serialize(self): |
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self._log_lock.acquire()
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try:
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return {
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"input": self.input.__getstate__(), |
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"status": self.status, |
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"result": self.result, |
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"log": self.log, |
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} |
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finally:
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self._log_lock.release()
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def Log(self, *args): |
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"""Append a log entry.
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"""
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assert len(args) < 3 |
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if len(args) == 1: |
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log_type = constants.ELOG_MESSAGE |
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log_msg = args[0]
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else:
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log_type, log_msg = args |
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self._log_lock.acquire()
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try:
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self.log.append((time.time(), log_type, log_msg))
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finally:
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self._log_lock.release()
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def RetrieveLog(self, start_at=0): |
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"""Retrieve (a part of) the execution log.
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"""
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self._log_lock.acquire()
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try:
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return self.log[start_at:] |
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finally:
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self._log_lock.release()
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class _QueuedJob(object): |
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"""In-memory job representation.
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This is what we use to track the user-submitted jobs.
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"""
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def __init__(self, queue, job_id, ops): |
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if not ops: |
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# TODO
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raise Exception("No opcodes") |
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self.queue = queue
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self.id = job_id
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self.ops = [_QueuedOpCode(op) for op in ops] |
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self.run_op_index = -1 |
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@classmethod
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def Restore(cls, queue, state): |
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obj = _QueuedJob.__new__(cls) |
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obj.queue = queue |
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obj.id = state["id"]
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obj.ops = [_QueuedOpCode.Restore(op_state) for op_state in state["ops"]] |
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obj.run_op_index = state["run_op_index"]
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return obj
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def Serialize(self): |
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return {
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"id": self.id, |
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"ops": [op.Serialize() for op in self.ops], |
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"run_op_index": self.run_op_index, |
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} |
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def CalcStatus(self): |
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status = constants.JOB_STATUS_QUEUED |
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all_success = True
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for op in self.ops: |
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if op.status == constants.OP_STATUS_SUCCESS:
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continue
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all_success = False
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if op.status == constants.OP_STATUS_QUEUED:
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pass
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elif op.status == constants.OP_STATUS_RUNNING:
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status = constants.JOB_STATUS_RUNNING |
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elif op.status == constants.OP_STATUS_ERROR:
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status = constants.JOB_STATUS_ERROR |
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# The whole job fails if one opcode failed
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break
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elif op.status == constants.OP_STATUS_CANCELED:
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status = constants.OP_STATUS_CANCELED |
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break
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if all_success:
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status = constants.JOB_STATUS_SUCCESS |
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return status
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class _JobQueueWorker(workerpool.BaseWorker): |
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def RunTask(self, job): |
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"""Job executor.
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This functions processes a job.
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"""
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logging.debug("Worker %s processing job %s",
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self.worker_id, job.id)
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proc = mcpu.Processor(self.pool.queue.context)
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queue = job.queue |
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try:
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try:
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count = len(job.ops)
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for idx, op in enumerate(job.ops): |
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try:
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logging.debug("Op %s/%s: Starting %s", idx + 1, count, op) |
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queue.acquire() |
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try:
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job.run_op_index = idx |
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op.status = constants.OP_STATUS_RUNNING |
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op.result = None
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queue.UpdateJobUnlocked(job) |
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input_opcode = op.input |
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finally:
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queue.release() |
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result = proc.ExecOpCode(input_opcode, op.Log) |
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queue.acquire() |
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try:
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op.status = constants.OP_STATUS_SUCCESS |
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op.result = result |
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queue.UpdateJobUnlocked(job) |
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finally:
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queue.release() |
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logging.debug("Op %s/%s: Successfully finished %s",
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idx + 1, count, op)
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except Exception, err: |
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queue.acquire() |
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try:
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try:
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op.status = constants.OP_STATUS_ERROR |
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op.result = str(err)
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logging.debug("Op %s/%s: Error in %s", idx + 1, count, op) |
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finally:
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queue.UpdateJobUnlocked(job) |
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finally:
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queue.release() |
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raise
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except errors.GenericError, err:
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logging.exception("Ganeti exception")
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except:
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logging.exception("Unhandled exception")
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finally:
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queue.acquire() |
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try:
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job_id = job.id |
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status = job.CalcStatus() |
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finally:
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queue.release() |
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logging.debug("Worker %s finished job %s, status = %s",
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self.worker_id, job_id, status)
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class _JobQueueWorkerPool(workerpool.WorkerPool): |
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def __init__(self, queue): |
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super(_JobQueueWorkerPool, self).__init__(JOBQUEUE_THREADS, |
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_JobQueueWorker) |
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self.queue = queue
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class JobQueue(object): |
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_RE_JOB_FILE = re.compile(r"^job-(%s)$" % constants.JOB_ID_TEMPLATE)
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def __init__(self, context): |
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self.context = context
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self._memcache = {}
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self._my_hostname = utils.HostInfo().name
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# Locking
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self._lock = threading.Lock()
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self.acquire = self._lock.acquire |
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self.release = self._lock.release |
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# Make sure our directories exists
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for path in (constants.QUEUE_DIR, constants.JOB_QUEUE_ARCHIVE_DIR): |
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try:
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os.mkdir(path, 0700)
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except OSError, err: |
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if err.errno not in (errno.EEXIST, ): |
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raise
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# Get queue lock
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self.lock_fd = open(constants.JOB_QUEUE_LOCK_FILE, "w") |
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try:
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utils.LockFile(self.lock_fd)
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except:
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self.lock_fd.close()
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raise
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# Read version
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try:
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version_fd = open(constants.JOB_QUEUE_VERSION_FILE, "r") |
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except IOError, err: |
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if err.errno not in (errno.ENOENT, ): |
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raise
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# Setup a new queue
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self._InitQueueUnlocked()
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# Try to open again
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version_fd = open(constants.JOB_QUEUE_VERSION_FILE, "r") |
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try:
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# Try to read version
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version = int(version_fd.read(128)) |
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# Verify version
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if version != constants.JOB_QUEUE_VERSION:
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raise errors.JobQueueError("Found version %s, expected %s", |
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version, constants.JOB_QUEUE_VERSION) |
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finally:
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version_fd.close() |
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self._last_serial = self._ReadSerial() |
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if self._last_serial is None: |
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raise errors.ConfigurationError("Can't read/parse the job queue serial" |
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" file")
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# Setup worker pool
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self._wpool = _JobQueueWorkerPool(self) |
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# We need to lock here because WorkerPool.AddTask() may start a job while
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# we're still doing our work.
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self.acquire()
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try:
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for job in self._GetJobsUnlocked(None): |
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status = job.CalcStatus() |
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if status in (constants.JOB_STATUS_QUEUED, ): |
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self._wpool.AddTask(job)
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elif status in (constants.JOB_STATUS_RUNNING, ): |
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logging.warning("Unfinished job %s found: %s", job.id, job)
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try:
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for op in job.ops: |
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op.status = constants.OP_STATUS_ERROR |
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op.result = "Unclean master daemon shutdown"
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finally:
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self.UpdateJobUnlocked(job)
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finally:
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self.release()
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@staticmethod
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def _ReadSerial(): |
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"""Try to read the job serial file.
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@rtype: None or int
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@return: If the serial can be read, then it is returned. Otherwise None
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is returned.
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"""
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try:
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serial_fd = open(constants.JOB_QUEUE_SERIAL_FILE, "r") |
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try:
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# Read last serial
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serial = int(serial_fd.read(1024).strip()) |
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finally:
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serial_fd.close() |
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except (ValueError, EnvironmentError): |
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serial = None
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return serial
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def _InitQueueUnlocked(self): |
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assert self.lock_fd, "Queue should be open" |
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utils.WriteFile(constants.JOB_QUEUE_VERSION_FILE, |
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data="%s\n" % constants.JOB_QUEUE_VERSION)
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if self._ReadSerial() is None: |
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utils.WriteFile(constants.JOB_QUEUE_SERIAL_FILE, |
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data="%s\n" % 0) |
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def _FormatJobID(self, job_id): |
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if not isinstance(job_id, (int, long)): |
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raise errors.ProgrammerError("Job ID '%s' not numeric" % job_id) |
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if job_id < 0: |
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raise errors.ProgrammerError("Job ID %s is negative" % job_id) |
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return str(job_id) |
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def _NewSerialUnlocked(self, nodes): |
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"""Generates a new job identifier.
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Job identifiers are unique during the lifetime of a cluster.
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Returns: A string representing the job identifier.
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"""
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assert self.lock_fd, "Queue should be open" |
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# New number
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serial = self._last_serial + 1 |
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# Write to file
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utils.WriteFile(constants.JOB_QUEUE_SERIAL_FILE, |
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data="%s\n" % serial)
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# Keep it only if we were able to write the file
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self._last_serial = serial
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# Distribute the serial to the other nodes
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try:
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nodes.remove(self._my_hostname)
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except ValueError: |
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pass
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result = rpc.call_upload_file(nodes, constants.JOB_QUEUE_SERIAL_FILE) |
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for node in nodes: |
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if not result[node]: |
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logging.error("copy of job queue file to node %s failed", node)
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return self._FormatJobID(serial) |
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@staticmethod
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def _GetJobPath(job_id): |
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return os.path.join(constants.QUEUE_DIR, "job-%s" % job_id) |
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@staticmethod
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def _GetArchivedJobPath(job_id): |
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return os.path.join(constants.JOB_QUEUE_ARCHIVE_DIR, "job-%s" % job_id) |
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@classmethod
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def _ExtractJobID(cls, name): |
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m = cls._RE_JOB_FILE.match(name) |
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if m:
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return m.group(1) |
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else:
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return None |
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def _GetJobIDsUnlocked(self, archived=False): |
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"""Return all known job IDs.
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If the parameter archived is True, archived jobs IDs will be
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included. Currently this argument is unused.
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The method only looks at disk because it's a requirement that all
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jobs are present on disk (so in the _memcache we don't have any
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extra IDs).
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"""
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jlist = [self._ExtractJobID(name) for name in self._ListJobFiles()] |
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jlist.sort() |
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return jlist
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def _ListJobFiles(self): |
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assert self.lock_fd, "Queue should be open" |
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return [name for name in utils.ListVisibleFiles(constants.QUEUE_DIR) |
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if self._RE_JOB_FILE.match(name)] |
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def _LoadJobUnlocked(self, job_id): |
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assert self.lock_fd, "Queue should be open" |
443 |
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if job_id in self._memcache: |
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logging.debug("Found job %s in memcache", job_id)
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return self._memcache[job_id] |
447 |
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filepath = self._GetJobPath(job_id)
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logging.debug("Loading job from %s", filepath)
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try:
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fd = open(filepath, "r") |
452 |
except IOError, err: |
453 |
if err.errno in (errno.ENOENT, ): |
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return None |
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raise
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try:
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data = serializer.LoadJson(fd.read()) |
458 |
finally:
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fd.close() |
460 |
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job = _QueuedJob.Restore(self, data)
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self._memcache[job_id] = job
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logging.debug("Added job %s to the cache", job_id)
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return job
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def _GetJobsUnlocked(self, job_ids): |
467 |
if not job_ids: |
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job_ids = self._GetJobIDsUnlocked()
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return [self._LoadJobUnlocked(job_id) for job_id in job_ids] |
471 |
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@utils.LockedMethod
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def SubmitJob(self, ops, nodes): |
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"""Create and store a new job.
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475 |
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This enters the job into our job queue and also puts it on the new
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queue, in order for it to be picked up by the queue processors.
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@type ops: list
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@param ops: The list of OpCodes that will become the new job.
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@type nodes: list
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@param nodes: The list of nodes to which the new job serial will be
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distributed.
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"""
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assert self.lock_fd, "Queue should be open" |
487 |
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# Get job identifier
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job_id = self._NewSerialUnlocked(nodes)
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job = _QueuedJob(self, job_id, ops)
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# Write to disk
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self.UpdateJobUnlocked(job)
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logging.debug("Added new job %s to the cache", job_id)
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self._memcache[job_id] = job
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# Add to worker pool
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self._wpool.AddTask(job)
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return job.id
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def UpdateJobUnlocked(self, job): |
504 |
assert self.lock_fd, "Queue should be open" |
505 |
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filename = self._GetJobPath(job.id)
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logging.debug("Writing job %s to %s", job.id, filename)
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utils.WriteFile(filename, |
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data=serializer.DumpJson(job.Serialize(), indent=False))
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self._CleanCacheUnlocked([job.id])
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def _CleanCacheUnlocked(self, exclude): |
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"""Clean the memory cache.
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The exceptions argument contains job IDs that should not be
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cleaned.
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"""
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assert isinstance(exclude, list) |
520 |
|
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for job in self._memcache.values(): |
522 |
if job.id in exclude: |
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continue
|
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if job.CalcStatus() not in (constants.JOB_STATUS_QUEUED, |
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constants.JOB_STATUS_RUNNING): |
526 |
logging.debug("Cleaning job %s from the cache", job.id)
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try:
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del self._memcache[job.id] |
529 |
except KeyError: |
530 |
pass
|
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|
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@utils.LockedMethod
|
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def CancelJob(self, job_id): |
534 |
"""Cancels a job.
|
535 |
|
536 |
@type job_id: string
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@param job_id: Job ID of job to be cancelled.
|
538 |
|
539 |
"""
|
540 |
logging.debug("Cancelling job %s", job_id)
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541 |
|
542 |
job = self._LoadJobUnlocked(job_id)
|
543 |
if not job: |
544 |
logging.debug("Job %s not found", job_id)
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return
|
546 |
|
547 |
if job.CalcStatus() not in (constants.JOB_STATUS_QUEUED,): |
548 |
logging.debug("Job %s is no longer in the queue", job.id)
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return
|
550 |
|
551 |
try:
|
552 |
for op in job.ops: |
553 |
op.status = constants.OP_STATUS_ERROR |
554 |
op.result = "Job cancelled by request"
|
555 |
finally:
|
556 |
self.UpdateJobUnlocked(job)
|
557 |
|
558 |
@utils.LockedMethod
|
559 |
def ArchiveJob(self, job_id): |
560 |
"""Archives a job.
|
561 |
|
562 |
@type job_id: string
|
563 |
@param job_id: Job ID of job to be archived.
|
564 |
|
565 |
"""
|
566 |
logging.debug("Archiving job %s", job_id)
|
567 |
|
568 |
job = self._LoadJobUnlocked(job_id)
|
569 |
if not job: |
570 |
logging.debug("Job %s not found", job_id)
|
571 |
return
|
572 |
|
573 |
if job.CalcStatus() not in (constants.JOB_STATUS_CANCELED, |
574 |
constants.JOB_STATUS_SUCCESS, |
575 |
constants.JOB_STATUS_ERROR): |
576 |
logging.debug("Job %s is not yet done", job.id)
|
577 |
return
|
578 |
|
579 |
try:
|
580 |
old = self._GetJobPath(job.id)
|
581 |
new = self._GetArchivedJobPath(job.id)
|
582 |
|
583 |
os.rename(old, new) |
584 |
|
585 |
logging.debug("Successfully archived job %s", job.id)
|
586 |
finally:
|
587 |
# Cleaning the cache because we don't know what os.rename actually did
|
588 |
# and to be on the safe side.
|
589 |
self._CleanCacheUnlocked([])
|
590 |
|
591 |
def _GetJobInfoUnlocked(self, job, fields): |
592 |
row = [] |
593 |
for fname in fields: |
594 |
if fname == "id": |
595 |
row.append(job.id) |
596 |
elif fname == "status": |
597 |
row.append(job.CalcStatus()) |
598 |
elif fname == "ops": |
599 |
row.append([op.input.__getstate__() for op in job.ops]) |
600 |
elif fname == "opresult": |
601 |
row.append([op.result for op in job.ops]) |
602 |
elif fname == "opstatus": |
603 |
row.append([op.status for op in job.ops]) |
604 |
elif fname == "ticker": |
605 |
ji = job.run_op_index |
606 |
if ji < 0: |
607 |
lmsg = None
|
608 |
else:
|
609 |
lmsg = job.ops[ji].RetrieveLog(-1)
|
610 |
# message might be empty here
|
611 |
if lmsg:
|
612 |
lmsg = lmsg[0]
|
613 |
else:
|
614 |
lmsg = None
|
615 |
row.append(lmsg) |
616 |
else:
|
617 |
raise errors.OpExecError("Invalid job query field '%s'" % fname) |
618 |
return row
|
619 |
|
620 |
@utils.LockedMethod
|
621 |
def QueryJobs(self, job_ids, fields): |
622 |
"""Returns a list of jobs in queue.
|
623 |
|
624 |
Args:
|
625 |
- job_ids: Sequence of job identifiers or None for all
|
626 |
- fields: Names of fields to return
|
627 |
|
628 |
"""
|
629 |
jobs = [] |
630 |
|
631 |
for job in self._GetJobsUnlocked(job_ids): |
632 |
if job is None: |
633 |
jobs.append(None)
|
634 |
else:
|
635 |
jobs.append(self._GetJobInfoUnlocked(job, fields))
|
636 |
|
637 |
return jobs
|
638 |
|
639 |
@utils.LockedMethod
|
640 |
def Shutdown(self): |
641 |
"""Stops the job queue.
|
642 |
|
643 |
"""
|
644 |
assert self.lock_fd, "Queue should be open" |
645 |
|
646 |
self._wpool.TerminateWorkers()
|
647 |
|
648 |
self.lock_fd.close()
|
649 |
self.lock_fd = None |