root / lib / jqueue.py @ 22f0f71d
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# Copyright (C) 2006, 2007, 2008 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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Locking: there's a single, large lock in the L{JobQueue} class. It's
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used by all other classes in this module.
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@var JOBQUEUE_THREADS: the number of worker threads we start for
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processing jobs
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"""
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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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import weakref |
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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 jstore |
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from ganeti import rpc |
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JOBQUEUE_THREADS = 25
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JOBS_PER_ARCHIVE_DIRECTORY = 10000
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class CancelJob(Exception): |
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"""Special exception to cancel a job.
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"""
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def TimeStampNow(): |
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"""Returns the current timestamp.
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@rtype: tuple
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@return: the current time in the (seconds, microseconds) format
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"""
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return utils.SplitTime(time.time())
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class _QueuedOpCode(object): |
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"""Encasulates an opcode object.
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@ivar log: holds the execution log and consists of tuples
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of the form C{(log_serial, timestamp, level, message)}
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@ivar input: the OpCode we encapsulate
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@ivar status: the current status
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@ivar result: the result of the LU execution
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@ivar start_timestamp: timestamp for the start of the execution
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@ivar stop_timestamp: timestamp for the end of the execution
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"""
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def __init__(self, op): |
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"""Constructor for the _QuededOpCode.
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@type op: L{opcodes.OpCode}
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@param op: the opcode we encapsulate
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"""
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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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self.start_timestamp = None |
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self.end_timestamp = None |
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@classmethod
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def Restore(cls, state): |
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"""Restore the _QueuedOpCode from the serialized form.
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@type state: dict
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@param state: the serialized state
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@rtype: _QueuedOpCode
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@return: a new _QueuedOpCode instance
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"""
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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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obj.start_timestamp = state.get("start_timestamp", None) |
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obj.end_timestamp = state.get("end_timestamp", None) |
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return obj
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def Serialize(self): |
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"""Serializes this _QueuedOpCode.
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@rtype: dict
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@return: the dictionary holding the serialized state
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"""
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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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"start_timestamp": self.start_timestamp, |
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"end_timestamp": self.end_timestamp, |
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} |
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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. Locking must
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be taken care of by users of this class.
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@type queue: L{JobQueue}
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@ivar queue: the parent queue
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@ivar id: the job ID
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@type ops: list
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@ivar ops: the list of _QueuedOpCode that constitute the job
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@type run_op_index: int
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@ivar run_op_index: the currently executing opcode, or -1 if
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we didn't yet start executing
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@type log_serial: int
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@ivar log_serial: holds the index for the next log entry
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@ivar received_timestamp: the timestamp for when the job was received
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@ivar start_timestmap: the timestamp for start of execution
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@ivar end_timestamp: the timestamp for end of execution
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@ivar change: a Condition variable we use for waiting for job changes
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"""
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def __init__(self, queue, job_id, ops): |
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"""Constructor for the _QueuedJob.
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@type queue: L{JobQueue}
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@param queue: our parent queue
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@type job_id: job_id
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@param job_id: our job id
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@type ops: list
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@param ops: the list of opcodes we hold, which will be encapsulated
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in _QueuedOpCodes
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"""
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if not ops: |
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# TODO: use a better exception
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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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self.log_serial = 0 |
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self.received_timestamp = TimeStampNow()
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self.start_timestamp = None |
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self.end_timestamp = None |
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# Condition to wait for changes
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self.change = threading.Condition(self.queue._lock) |
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@classmethod
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def Restore(cls, queue, state): |
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"""Restore a _QueuedJob from serialized state:
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@type queue: L{JobQueue}
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@param queue: to which queue the restored job belongs
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@type state: dict
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@param state: the serialized state
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@rtype: _JobQueue
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@return: the restored _JobQueue instance
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"""
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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.run_op_index = state["run_op_index"]
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obj.received_timestamp = state.get("received_timestamp", None) |
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obj.start_timestamp = state.get("start_timestamp", None) |
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obj.end_timestamp = state.get("end_timestamp", None) |
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obj.ops = [] |
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obj.log_serial = 0
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for op_state in state["ops"]: |
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op = _QueuedOpCode.Restore(op_state) |
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for log_entry in op.log: |
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obj.log_serial = max(obj.log_serial, log_entry[0]) |
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obj.ops.append(op) |
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# Condition to wait for changes
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obj.change = threading.Condition(obj.queue._lock) |
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return obj
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def Serialize(self): |
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"""Serialize the _JobQueue instance.
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@rtype: dict
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@return: the serialized state
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"""
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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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"start_timestamp": self.start_timestamp, |
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"end_timestamp": self.end_timestamp, |
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"received_timestamp": self.received_timestamp, |
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} |
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def CalcStatus(self): |
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"""Compute the status of this job.
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This function iterates over all the _QueuedOpCodes in the job and
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based on their status, computes the job status.
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The algorithm is:
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- if we find a cancelled, or finished with error, the job
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status will be the same
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- otherwise, the last opcode with the status one of:
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- waitlock
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- canceling
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- running
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will determine the job status
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- otherwise, it means either all opcodes are queued, or success,
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and the job status will be the same
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@return: the job status
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"""
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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_WAITLOCK:
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status = constants.JOB_STATUS_WAITLOCK |
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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_CANCELING:
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status = constants.JOB_STATUS_CANCELING |
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break
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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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def GetLogEntries(self, newer_than): |
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"""Selectively returns the log entries.
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@type newer_than: None or int
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@param newer_than: if this is None, return all log enties,
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otherwise return only the log entries with serial higher
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than this value
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@rtype: list
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@return: the list of the log entries selected
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"""
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if newer_than is None: |
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serial = -1
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else:
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serial = newer_than |
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entries = [] |
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for op in self.ops: |
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entries.extend(filter(lambda entry: entry[0] > serial, op.log)) |
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return entries
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class _JobQueueWorker(workerpool.BaseWorker): |
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"""The actual job workers.
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"""
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def _NotifyStart(self): |
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"""Mark the opcode as running, not lock-waiting.
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This is called from the mcpu code as a notifier function, when the
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LU is finally about to start the Exec() method. Of course, to have
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end-user visible results, the opcode must be initially (before
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calling into Processor.ExecOpCode) set to OP_STATUS_WAITLOCK.
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"""
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assert self.queue, "Queue attribute is missing" |
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assert self.opcode, "Opcode attribute is missing" |
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self.queue.acquire()
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try:
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assert self.opcode.status in (constants.OP_STATUS_WAITLOCK, |
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constants.OP_STATUS_CANCELING) |
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# Cancel here if we were asked to
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if self.opcode.status == constants.OP_STATUS_CANCELING: |
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raise CancelJob()
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self.opcode.status = constants.OP_STATUS_RUNNING
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finally:
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self.queue.release()
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def RunTask(self, job): |
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"""Job executor.
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This functions processes a job. It is closely tied to the _QueuedJob and
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_QueuedOpCode classes.
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@type job: L{_QueuedJob}
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@param job: the job to be processed
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"""
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logging.info("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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self.queue = 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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op_summary = op.input.Summary() |
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try:
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logging.info("Op %s/%s: Starting opcode %s", idx + 1, count, |
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op_summary) |
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queue.acquire() |
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try:
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if op.status == constants.OP_STATUS_CANCELED:
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raise CancelJob()
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assert op.status == constants.OP_STATUS_QUEUED
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job.run_op_index = idx |
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op.status = constants.OP_STATUS_WAITLOCK |
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op.result = None
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op.start_timestamp = TimeStampNow() |
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if idx == 0: # first opcode |
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job.start_timestamp = op.start_timestamp |
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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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def _Log(*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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# The time is split to make serialization easier and not lose
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# precision.
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timestamp = utils.SplitTime(time.time()) |
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queue.acquire() |
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try:
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job.log_serial += 1
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op.log.append((job.log_serial, timestamp, log_type, log_msg)) |
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job.change.notifyAll() |
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finally:
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queue.release() |
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# Make sure not to hold lock while _Log is called
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self.opcode = op
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result = proc.ExecOpCode(input_opcode, _Log, self._NotifyStart)
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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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op.end_timestamp = TimeStampNow() |
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queue.UpdateJobUnlocked(job) |
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finally:
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queue.release() |
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logging.info("Op %s/%s: Successfully finished opcode %s",
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idx + 1, count, op_summary)
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except CancelJob:
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# Will be handled further up
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raise
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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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op.end_timestamp = TimeStampNow() |
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logging.info("Op %s/%s: Error in opcode %s", idx + 1, count, |
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op_summary) |
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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 CancelJob:
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queue.acquire() |
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try:
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queue.CancelJobUnlocked(job) |
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finally:
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queue.release() |
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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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try:
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job.run_op_idx = -1
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job.end_timestamp = TimeStampNow() |
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queue.UpdateJobUnlocked(job) |
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finally:
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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.info("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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"""Simple class implementing a job-processing workerpool.
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"""
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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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"""Quue used to manaage the jobs.
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@cvar _RE_JOB_FILE: regex matching the valid job file names
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"""
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_RE_JOB_FILE = re.compile(r"^job-(%s)$" % constants.JOB_ID_TEMPLATE)
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def _RequireOpenQueue(fn): |
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"""Decorator for "public" functions.
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This function should be used for all 'public' functions. That is,
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functions usually called from other classes.
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@warning: Use this decorator only after utils.LockedMethod!
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Example::
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@utils.LockedMethod
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@_RequireOpenQueue
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def Example(self):
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pass
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"""
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def wrapper(self, *args, **kwargs): |
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assert self._queue_lock is not None, "Queue should be open" |
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return fn(self, *args, **kwargs) |
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return wrapper
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def __init__(self, context): |
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"""Constructor for JobQueue.
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The constructor will initialize the job queue object and then
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start loading the current jobs from disk, either for starting them
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(if they were queue) or for aborting them (if they were already
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running).
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@type context: GanetiContext
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@param context: the context object for access to the configuration
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data and other ganeti objects
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"""
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self.context = context
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self._memcache = weakref.WeakValueDictionary()
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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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# Initialize
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self._queue_lock = jstore.InitAndVerifyQueue(must_lock=True) |
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# Read serial file
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self._last_serial = jstore.ReadSerial()
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assert self._last_serial is not None, ("Serial file was modified between" |
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" check in jstore and here")
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# Get initial list of nodes
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self._nodes = dict((n.name, n.primary_ip) |
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for n in self.context.cfg.GetAllNodesInfo().values() |
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if n.master_candidate)
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|
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# Remove master node
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try:
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del self._nodes[self._my_hostname] |
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except KeyError: |
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pass
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|
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# TODO: Check consistency across nodes
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|
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# Setup worker pool
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self._wpool = _JobQueueWorkerPool(self) |
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try:
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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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logging.info("Inspecting job queue")
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550 |
|
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all_job_ids = self._GetJobIDsUnlocked()
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jobs_count = len(all_job_ids)
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lastinfo = time.time() |
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for idx, job_id in enumerate(all_job_ids): |
555 |
# Give an update every 1000 jobs or 10 seconds
|
556 |
if (idx % 1000 == 0 or time.time() >= (lastinfo + 10.0) or |
557 |
idx == (jobs_count - 1)):
|
558 |
logging.info("Job queue inspection: %d/%d (%0.1f %%)",
|
559 |
idx, jobs_count - 1, 100.0 * (idx + 1) / jobs_count) |
560 |
lastinfo = time.time() |
561 |
|
562 |
job = self._LoadJobUnlocked(job_id)
|
563 |
|
564 |
# a failure in loading the job can cause 'None' to be returned
|
565 |
if job is None: |
566 |
continue
|
567 |
|
568 |
status = job.CalcStatus() |
569 |
|
570 |
if status in (constants.JOB_STATUS_QUEUED, ): |
571 |
self._wpool.AddTask(job)
|
572 |
|
573 |
elif status in (constants.JOB_STATUS_RUNNING, |
574 |
constants.JOB_STATUS_WAITLOCK, |
575 |
constants.JOB_STATUS_CANCELING): |
576 |
logging.warning("Unfinished job %s found: %s", job.id, job)
|
577 |
try:
|
578 |
for op in job.ops: |
579 |
op.status = constants.OP_STATUS_ERROR |
580 |
op.result = "Unclean master daemon shutdown"
|
581 |
finally:
|
582 |
self.UpdateJobUnlocked(job)
|
583 |
|
584 |
logging.info("Job queue inspection finished")
|
585 |
finally:
|
586 |
self.release()
|
587 |
except:
|
588 |
self._wpool.TerminateWorkers()
|
589 |
raise
|
590 |
|
591 |
@utils.LockedMethod
|
592 |
@_RequireOpenQueue
|
593 |
def AddNode(self, node): |
594 |
"""Register a new node with the queue.
|
595 |
|
596 |
@type node: L{objects.Node}
|
597 |
@param node: the node object to be added
|
598 |
|
599 |
"""
|
600 |
node_name = node.name |
601 |
assert node_name != self._my_hostname |
602 |
|
603 |
# Clean queue directory on added node
|
604 |
rpc.RpcRunner.call_jobqueue_purge(node_name) |
605 |
|
606 |
if not node.master_candidate: |
607 |
# remove if existing, ignoring errors
|
608 |
self._nodes.pop(node_name, None) |
609 |
# and skip the replication of the job ids
|
610 |
return
|
611 |
|
612 |
# Upload the whole queue excluding archived jobs
|
613 |
files = [self._GetJobPath(job_id) for job_id in self._GetJobIDsUnlocked()] |
614 |
|
615 |
# Upload current serial file
|
616 |
files.append(constants.JOB_QUEUE_SERIAL_FILE) |
617 |
|
618 |
for file_name in files: |
619 |
# Read file content
|
620 |
fd = open(file_name, "r") |
621 |
try:
|
622 |
content = fd.read() |
623 |
finally:
|
624 |
fd.close() |
625 |
|
626 |
result = rpc.RpcRunner.call_jobqueue_update([node_name], |
627 |
[node.primary_ip], |
628 |
file_name, content) |
629 |
if not result[node_name]: |
630 |
logging.error("Failed to upload %s to %s", file_name, node_name)
|
631 |
|
632 |
self._nodes[node_name] = node.primary_ip
|
633 |
|
634 |
@utils.LockedMethod
|
635 |
@_RequireOpenQueue
|
636 |
def RemoveNode(self, node_name): |
637 |
"""Callback called when removing nodes from the cluster.
|
638 |
|
639 |
@type node_name: str
|
640 |
@param node_name: the name of the node to remove
|
641 |
|
642 |
"""
|
643 |
try:
|
644 |
# The queue is removed by the "leave node" RPC call.
|
645 |
del self._nodes[node_name] |
646 |
except KeyError: |
647 |
pass
|
648 |
|
649 |
def _CheckRpcResult(self, result, nodes, failmsg): |
650 |
"""Verifies the status of an RPC call.
|
651 |
|
652 |
Since we aim to keep consistency should this node (the current
|
653 |
master) fail, we will log errors if our rpc fail, and especially
|
654 |
log the case when more than half of the nodes failes.
|
655 |
|
656 |
@param result: the data as returned from the rpc call
|
657 |
@type nodes: list
|
658 |
@param nodes: the list of nodes we made the call to
|
659 |
@type failmsg: str
|
660 |
@param failmsg: the identifier to be used for logging
|
661 |
|
662 |
"""
|
663 |
failed = [] |
664 |
success = [] |
665 |
|
666 |
for node in nodes: |
667 |
if result[node]:
|
668 |
success.append(node) |
669 |
else:
|
670 |
failed.append(node) |
671 |
|
672 |
if failed:
|
673 |
logging.error("%s failed on %s", failmsg, ", ".join(failed)) |
674 |
|
675 |
# +1 for the master node
|
676 |
if (len(success) + 1) < len(failed): |
677 |
# TODO: Handle failing nodes
|
678 |
logging.error("More than half of the nodes failed")
|
679 |
|
680 |
def _GetNodeIp(self): |
681 |
"""Helper for returning the node name/ip list.
|
682 |
|
683 |
@rtype: (list, list)
|
684 |
@return: a tuple of two lists, the first one with the node
|
685 |
names and the second one with the node addresses
|
686 |
|
687 |
"""
|
688 |
name_list = self._nodes.keys()
|
689 |
addr_list = [self._nodes[name] for name in name_list] |
690 |
return name_list, addr_list
|
691 |
|
692 |
def _WriteAndReplicateFileUnlocked(self, file_name, data): |
693 |
"""Writes a file locally and then replicates it to all nodes.
|
694 |
|
695 |
This function will replace the contents of a file on the local
|
696 |
node and then replicate it to all the other nodes we have.
|
697 |
|
698 |
@type file_name: str
|
699 |
@param file_name: the path of the file to be replicated
|
700 |
@type data: str
|
701 |
@param data: the new contents of the file
|
702 |
|
703 |
"""
|
704 |
utils.WriteFile(file_name, data=data) |
705 |
|
706 |
names, addrs = self._GetNodeIp()
|
707 |
result = rpc.RpcRunner.call_jobqueue_update(names, addrs, file_name, data) |
708 |
self._CheckRpcResult(result, self._nodes, |
709 |
"Updating %s" % file_name)
|
710 |
|
711 |
def _RenameFilesUnlocked(self, rename): |
712 |
"""Renames a file locally and then replicate the change.
|
713 |
|
714 |
This function will rename a file in the local queue directory
|
715 |
and then replicate this rename to all the other nodes we have.
|
716 |
|
717 |
@type rename: list of (old, new)
|
718 |
@param rename: List containing tuples mapping old to new names
|
719 |
|
720 |
"""
|
721 |
# Rename them locally
|
722 |
for old, new in rename: |
723 |
utils.RenameFile(old, new, mkdir=True)
|
724 |
|
725 |
# ... and on all nodes
|
726 |
names, addrs = self._GetNodeIp()
|
727 |
result = rpc.RpcRunner.call_jobqueue_rename(names, addrs, rename) |
728 |
self._CheckRpcResult(result, self._nodes, "Renaming files (%r)" % rename) |
729 |
|
730 |
def _FormatJobID(self, job_id): |
731 |
"""Convert a job ID to string format.
|
732 |
|
733 |
Currently this just does C{str(job_id)} after performing some
|
734 |
checks, but if we want to change the job id format this will
|
735 |
abstract this change.
|
736 |
|
737 |
@type job_id: int or long
|
738 |
@param job_id: the numeric job id
|
739 |
@rtype: str
|
740 |
@return: the formatted job id
|
741 |
|
742 |
"""
|
743 |
if not isinstance(job_id, (int, long)): |
744 |
raise errors.ProgrammerError("Job ID '%s' not numeric" % job_id) |
745 |
if job_id < 0: |
746 |
raise errors.ProgrammerError("Job ID %s is negative" % job_id) |
747 |
|
748 |
return str(job_id) |
749 |
|
750 |
@classmethod
|
751 |
def _GetArchiveDirectory(cls, job_id): |
752 |
"""Returns the archive directory for a job.
|
753 |
|
754 |
@type job_id: str
|
755 |
@param job_id: Job identifier
|
756 |
@rtype: str
|
757 |
@return: Directory name
|
758 |
|
759 |
"""
|
760 |
return str(int(job_id) / JOBS_PER_ARCHIVE_DIRECTORY) |
761 |
|
762 |
def _NewSerialUnlocked(self): |
763 |
"""Generates a new job identifier.
|
764 |
|
765 |
Job identifiers are unique during the lifetime of a cluster.
|
766 |
|
767 |
@rtype: str
|
768 |
@return: a string representing the job identifier.
|
769 |
|
770 |
"""
|
771 |
# New number
|
772 |
serial = self._last_serial + 1 |
773 |
|
774 |
# Write to file
|
775 |
self._WriteAndReplicateFileUnlocked(constants.JOB_QUEUE_SERIAL_FILE,
|
776 |
"%s\n" % serial)
|
777 |
|
778 |
# Keep it only if we were able to write the file
|
779 |
self._last_serial = serial
|
780 |
|
781 |
return self._FormatJobID(serial) |
782 |
|
783 |
@staticmethod
|
784 |
def _GetJobPath(job_id): |
785 |
"""Returns the job file for a given job id.
|
786 |
|
787 |
@type job_id: str
|
788 |
@param job_id: the job identifier
|
789 |
@rtype: str
|
790 |
@return: the path to the job file
|
791 |
|
792 |
"""
|
793 |
return os.path.join(constants.QUEUE_DIR, "job-%s" % job_id) |
794 |
|
795 |
@classmethod
|
796 |
def _GetArchivedJobPath(cls, job_id): |
797 |
"""Returns the archived job file for a give job id.
|
798 |
|
799 |
@type job_id: str
|
800 |
@param job_id: the job identifier
|
801 |
@rtype: str
|
802 |
@return: the path to the archived job file
|
803 |
|
804 |
"""
|
805 |
path = "%s/job-%s" % (cls._GetArchiveDirectory(job_id), job_id)
|
806 |
return os.path.join(constants.JOB_QUEUE_ARCHIVE_DIR, path)
|
807 |
|
808 |
@classmethod
|
809 |
def _ExtractJobID(cls, name): |
810 |
"""Extract the job id from a filename.
|
811 |
|
812 |
@type name: str
|
813 |
@param name: the job filename
|
814 |
@rtype: job id or None
|
815 |
@return: the job id corresponding to the given filename,
|
816 |
or None if the filename does not represent a valid
|
817 |
job file
|
818 |
|
819 |
"""
|
820 |
m = cls._RE_JOB_FILE.match(name) |
821 |
if m:
|
822 |
return m.group(1) |
823 |
else:
|
824 |
return None |
825 |
|
826 |
def _GetJobIDsUnlocked(self, archived=False): |
827 |
"""Return all known job IDs.
|
828 |
|
829 |
If the parameter archived is True, archived jobs IDs will be
|
830 |
included. Currently this argument is unused.
|
831 |
|
832 |
The method only looks at disk because it's a requirement that all
|
833 |
jobs are present on disk (so in the _memcache we don't have any
|
834 |
extra IDs).
|
835 |
|
836 |
@rtype: list
|
837 |
@return: the list of job IDs
|
838 |
|
839 |
"""
|
840 |
jlist = [self._ExtractJobID(name) for name in self._ListJobFiles()] |
841 |
jlist = utils.NiceSort(jlist) |
842 |
return jlist
|
843 |
|
844 |
def _ListJobFiles(self): |
845 |
"""Returns the list of current job files.
|
846 |
|
847 |
@rtype: list
|
848 |
@return: the list of job file names
|
849 |
|
850 |
"""
|
851 |
return [name for name in utils.ListVisibleFiles(constants.QUEUE_DIR) |
852 |
if self._RE_JOB_FILE.match(name)] |
853 |
|
854 |
def _LoadJobUnlocked(self, job_id): |
855 |
"""Loads a job from the disk or memory.
|
856 |
|
857 |
Given a job id, this will return the cached job object if
|
858 |
existing, or try to load the job from the disk. If loading from
|
859 |
disk, it will also add the job to the cache.
|
860 |
|
861 |
@param job_id: the job id
|
862 |
@rtype: L{_QueuedJob} or None
|
863 |
@return: either None or the job object
|
864 |
|
865 |
"""
|
866 |
job = self._memcache.get(job_id, None) |
867 |
if job:
|
868 |
logging.debug("Found job %s in memcache", job_id)
|
869 |
return job
|
870 |
|
871 |
filepath = self._GetJobPath(job_id)
|
872 |
logging.debug("Loading job from %s", filepath)
|
873 |
try:
|
874 |
fd = open(filepath, "r") |
875 |
except IOError, err: |
876 |
if err.errno in (errno.ENOENT, ): |
877 |
return None |
878 |
raise
|
879 |
try:
|
880 |
data = serializer.LoadJson(fd.read()) |
881 |
finally:
|
882 |
fd.close() |
883 |
|
884 |
try:
|
885 |
job = _QueuedJob.Restore(self, data)
|
886 |
except Exception, err: |
887 |
new_path = self._GetArchivedJobPath(job_id)
|
888 |
if filepath == new_path:
|
889 |
# job already archived (future case)
|
890 |
logging.exception("Can't parse job %s", job_id)
|
891 |
else:
|
892 |
# non-archived case
|
893 |
logging.exception("Can't parse job %s, will archive.", job_id)
|
894 |
self._RenameFilesUnlocked([(filepath, new_path)])
|
895 |
return None |
896 |
|
897 |
self._memcache[job_id] = job
|
898 |
logging.debug("Added job %s to the cache", job_id)
|
899 |
return job
|
900 |
|
901 |
def _GetJobsUnlocked(self, job_ids): |
902 |
"""Return a list of jobs based on their IDs.
|
903 |
|
904 |
@type job_ids: list
|
905 |
@param job_ids: either an empty list (meaning all jobs),
|
906 |
or a list of job IDs
|
907 |
@rtype: list
|
908 |
@return: the list of job objects
|
909 |
|
910 |
"""
|
911 |
if not job_ids: |
912 |
job_ids = self._GetJobIDsUnlocked()
|
913 |
|
914 |
return [self._LoadJobUnlocked(job_id) for job_id in job_ids] |
915 |
|
916 |
@staticmethod
|
917 |
def _IsQueueMarkedDrain(): |
918 |
"""Check if the queue is marked from drain.
|
919 |
|
920 |
This currently uses the queue drain file, which makes it a
|
921 |
per-node flag. In the future this can be moved to the config file.
|
922 |
|
923 |
@rtype: boolean
|
924 |
@return: True of the job queue is marked for draining
|
925 |
|
926 |
"""
|
927 |
return os.path.exists(constants.JOB_QUEUE_DRAIN_FILE)
|
928 |
|
929 |
@staticmethod
|
930 |
def SetDrainFlag(drain_flag): |
931 |
"""Sets the drain flag for the queue.
|
932 |
|
933 |
This is similar to the function L{backend.JobQueueSetDrainFlag},
|
934 |
and in the future we might merge them.
|
935 |
|
936 |
@type drain_flag: boolean
|
937 |
@param drain_flag: wheter to set or unset the drain flag
|
938 |
|
939 |
"""
|
940 |
if drain_flag:
|
941 |
utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True) |
942 |
else:
|
943 |
utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE) |
944 |
return True |
945 |
|
946 |
@utils.LockedMethod
|
947 |
@_RequireOpenQueue
|
948 |
def SubmitJob(self, ops): |
949 |
"""Create and store a new job.
|
950 |
|
951 |
This enters the job into our job queue and also puts it on the new
|
952 |
queue, in order for it to be picked up by the queue processors.
|
953 |
|
954 |
@type ops: list
|
955 |
@param ops: The list of OpCodes that will become the new job.
|
956 |
@rtype: job ID
|
957 |
@return: the job ID of the newly created job
|
958 |
@raise errors.JobQueueDrainError: if the job is marked for draining
|
959 |
|
960 |
"""
|
961 |
if self._IsQueueMarkedDrain(): |
962 |
raise errors.JobQueueDrainError()
|
963 |
|
964 |
# Check job queue size
|
965 |
size = len(self._ListJobFiles()) |
966 |
if size >= constants.JOB_QUEUE_SIZE_SOFT_LIMIT:
|
967 |
# TODO: Autoarchive jobs. Make sure it's not done on every job
|
968 |
# submission, though.
|
969 |
#size = ...
|
970 |
pass
|
971 |
|
972 |
if size >= constants.JOB_QUEUE_SIZE_HARD_LIMIT:
|
973 |
raise errors.JobQueueFull()
|
974 |
|
975 |
# Get job identifier
|
976 |
job_id = self._NewSerialUnlocked()
|
977 |
job = _QueuedJob(self, job_id, ops)
|
978 |
|
979 |
# Write to disk
|
980 |
self.UpdateJobUnlocked(job)
|
981 |
|
982 |
logging.debug("Adding new job %s to the cache", job_id)
|
983 |
self._memcache[job_id] = job
|
984 |
|
985 |
# Add to worker pool
|
986 |
self._wpool.AddTask(job)
|
987 |
|
988 |
return job.id
|
989 |
|
990 |
@_RequireOpenQueue
|
991 |
def UpdateJobUnlocked(self, job): |
992 |
"""Update a job's on disk storage.
|
993 |
|
994 |
After a job has been modified, this function needs to be called in
|
995 |
order to write the changes to disk and replicate them to the other
|
996 |
nodes.
|
997 |
|
998 |
@type job: L{_QueuedJob}
|
999 |
@param job: the changed job
|
1000 |
|
1001 |
"""
|
1002 |
filename = self._GetJobPath(job.id)
|
1003 |
data = serializer.DumpJson(job.Serialize(), indent=False)
|
1004 |
logging.debug("Writing job %s to %s", job.id, filename)
|
1005 |
self._WriteAndReplicateFileUnlocked(filename, data)
|
1006 |
|
1007 |
# Notify waiters about potential changes
|
1008 |
job.change.notifyAll() |
1009 |
|
1010 |
@utils.LockedMethod
|
1011 |
@_RequireOpenQueue
|
1012 |
def WaitForJobChanges(self, job_id, fields, prev_job_info, prev_log_serial, |
1013 |
timeout): |
1014 |
"""Waits for changes in a job.
|
1015 |
|
1016 |
@type job_id: string
|
1017 |
@param job_id: Job identifier
|
1018 |
@type fields: list of strings
|
1019 |
@param fields: Which fields to check for changes
|
1020 |
@type prev_job_info: list or None
|
1021 |
@param prev_job_info: Last job information returned
|
1022 |
@type prev_log_serial: int
|
1023 |
@param prev_log_serial: Last job message serial number
|
1024 |
@type timeout: float
|
1025 |
@param timeout: maximum time to wait
|
1026 |
@rtype: tuple (job info, log entries)
|
1027 |
@return: a tuple of the job information as required via
|
1028 |
the fields parameter, and the log entries as a list
|
1029 |
|
1030 |
if the job has not changed and the timeout has expired,
|
1031 |
we instead return a special value,
|
1032 |
L{constants.JOB_NOTCHANGED}, which should be interpreted
|
1033 |
as such by the clients
|
1034 |
|
1035 |
"""
|
1036 |
logging.debug("Waiting for changes in job %s", job_id)
|
1037 |
end_time = time.time() + timeout |
1038 |
while True: |
1039 |
delta_time = end_time - time.time() |
1040 |
if delta_time < 0: |
1041 |
return constants.JOB_NOTCHANGED
|
1042 |
|
1043 |
job = self._LoadJobUnlocked(job_id)
|
1044 |
if not job: |
1045 |
logging.debug("Job %s not found", job_id)
|
1046 |
break
|
1047 |
|
1048 |
status = job.CalcStatus() |
1049 |
job_info = self._GetJobInfoUnlocked(job, fields)
|
1050 |
log_entries = job.GetLogEntries(prev_log_serial) |
1051 |
|
1052 |
# Serializing and deserializing data can cause type changes (e.g. from
|
1053 |
# tuple to list) or precision loss. We're doing it here so that we get
|
1054 |
# the same modifications as the data received from the client. Without
|
1055 |
# this, the comparison afterwards might fail without the data being
|
1056 |
# significantly different.
|
1057 |
job_info = serializer.LoadJson(serializer.DumpJson(job_info)) |
1058 |
log_entries = serializer.LoadJson(serializer.DumpJson(log_entries)) |
1059 |
|
1060 |
if status not in (constants.JOB_STATUS_QUEUED, |
1061 |
constants.JOB_STATUS_RUNNING, |
1062 |
constants.JOB_STATUS_WAITLOCK): |
1063 |
# Don't even try to wait if the job is no longer running, there will be
|
1064 |
# no changes.
|
1065 |
break
|
1066 |
|
1067 |
if (prev_job_info != job_info or |
1068 |
(log_entries and prev_log_serial != log_entries[0][0])): |
1069 |
break
|
1070 |
|
1071 |
logging.debug("Waiting again")
|
1072 |
|
1073 |
# Release the queue lock while waiting
|
1074 |
job.change.wait(delta_time) |
1075 |
|
1076 |
logging.debug("Job %s changed", job_id)
|
1077 |
|
1078 |
return (job_info, log_entries)
|
1079 |
|
1080 |
@utils.LockedMethod
|
1081 |
@_RequireOpenQueue
|
1082 |
def CancelJob(self, job_id): |
1083 |
"""Cancels a job.
|
1084 |
|
1085 |
This will only succeed if the job has not started yet.
|
1086 |
|
1087 |
@type job_id: string
|
1088 |
@param job_id: job ID of job to be cancelled.
|
1089 |
|
1090 |
"""
|
1091 |
logging.info("Cancelling job %s", job_id)
|
1092 |
|
1093 |
job = self._LoadJobUnlocked(job_id)
|
1094 |
if not job: |
1095 |
logging.debug("Job %s not found", job_id)
|
1096 |
return (False, "Job %s not found" % job_id) |
1097 |
|
1098 |
job_status = job.CalcStatus() |
1099 |
|
1100 |
if job_status not in (constants.JOB_STATUS_QUEUED, |
1101 |
constants.JOB_STATUS_WAITLOCK): |
1102 |
logging.debug("Job %s is no longer in the queue", job.id)
|
1103 |
return (False, "Job %s is no longer in the queue" % job.id) |
1104 |
|
1105 |
if job_status == constants.JOB_STATUS_QUEUED:
|
1106 |
self.CancelJobUnlocked(job)
|
1107 |
return (True, "Job %s canceled" % job.id) |
1108 |
|
1109 |
elif job_status == constants.JOB_STATUS_WAITLOCK:
|
1110 |
# The worker will notice the new status and cancel the job
|
1111 |
try:
|
1112 |
for op in job.ops: |
1113 |
op.status = constants.OP_STATUS_CANCELING |
1114 |
finally:
|
1115 |
self.UpdateJobUnlocked(job)
|
1116 |
return (True, "Job %s will be canceled" % job.id) |
1117 |
|
1118 |
@_RequireOpenQueue
|
1119 |
def CancelJobUnlocked(self, job): |
1120 |
"""Marks a job as canceled.
|
1121 |
|
1122 |
"""
|
1123 |
try:
|
1124 |
for op in job.ops: |
1125 |
op.status = constants.OP_STATUS_CANCELED |
1126 |
op.result = "Job canceled by request"
|
1127 |
finally:
|
1128 |
self.UpdateJobUnlocked(job)
|
1129 |
|
1130 |
@_RequireOpenQueue
|
1131 |
def _ArchiveJobsUnlocked(self, jobs): |
1132 |
"""Archives jobs.
|
1133 |
|
1134 |
@type jobs: list of L{_QueuedJob}
|
1135 |
@param jobs: Job objects
|
1136 |
@rtype: int
|
1137 |
@return: Number of archived jobs
|
1138 |
|
1139 |
"""
|
1140 |
archive_jobs = [] |
1141 |
rename_files = [] |
1142 |
for job in jobs: |
1143 |
if job.CalcStatus() not in (constants.JOB_STATUS_CANCELED, |
1144 |
constants.JOB_STATUS_SUCCESS, |
1145 |
constants.JOB_STATUS_ERROR): |
1146 |
logging.debug("Job %s is not yet done", job.id)
|
1147 |
continue
|
1148 |
|
1149 |
archive_jobs.append(job) |
1150 |
|
1151 |
old = self._GetJobPath(job.id)
|
1152 |
new = self._GetArchivedJobPath(job.id)
|
1153 |
rename_files.append((old, new)) |
1154 |
|
1155 |
# TODO: What if 1..n files fail to rename?
|
1156 |
self._RenameFilesUnlocked(rename_files)
|
1157 |
|
1158 |
logging.debug("Successfully archived job(s) %s",
|
1159 |
", ".join(job.id for job in archive_jobs)) |
1160 |
|
1161 |
return len(archive_jobs) |
1162 |
|
1163 |
@utils.LockedMethod
|
1164 |
@_RequireOpenQueue
|
1165 |
def ArchiveJob(self, job_id): |
1166 |
"""Archives a job.
|
1167 |
|
1168 |
This is just a wrapper over L{_ArchiveJobsUnlocked}.
|
1169 |
|
1170 |
@type job_id: string
|
1171 |
@param job_id: Job ID of job to be archived.
|
1172 |
@rtype: bool
|
1173 |
@return: Whether job was archived
|
1174 |
|
1175 |
"""
|
1176 |
logging.info("Archiving job %s", job_id)
|
1177 |
|
1178 |
job = self._LoadJobUnlocked(job_id)
|
1179 |
if not job: |
1180 |
logging.debug("Job %s not found", job_id)
|
1181 |
return False |
1182 |
|
1183 |
return self._ArchiveJobsUnlocked([job]) == 1 |
1184 |
|
1185 |
@utils.LockedMethod
|
1186 |
@_RequireOpenQueue
|
1187 |
def AutoArchiveJobs(self, age, timeout): |
1188 |
"""Archives all jobs based on age.
|
1189 |
|
1190 |
The method will archive all jobs which are older than the age
|
1191 |
parameter. For jobs that don't have an end timestamp, the start
|
1192 |
timestamp will be considered. The special '-1' age will cause
|
1193 |
archival of all jobs (that are not running or queued).
|
1194 |
|
1195 |
@type age: int
|
1196 |
@param age: the minimum age in seconds
|
1197 |
|
1198 |
"""
|
1199 |
logging.info("Archiving jobs with age more than %s seconds", age)
|
1200 |
|
1201 |
now = time.time() |
1202 |
end_time = now + timeout |
1203 |
archived_count = 0
|
1204 |
last_touched = 0
|
1205 |
|
1206 |
all_job_ids = self._GetJobIDsUnlocked(archived=False) |
1207 |
pending = [] |
1208 |
for idx, job_id in enumerate(all_job_ids): |
1209 |
last_touched = idx |
1210 |
|
1211 |
# Not optimal because jobs could be pending
|
1212 |
# TODO: Measure average duration for job archival and take number of
|
1213 |
# pending jobs into account.
|
1214 |
if time.time() > end_time:
|
1215 |
break
|
1216 |
|
1217 |
# Returns None if the job failed to load
|
1218 |
job = self._LoadJobUnlocked(job_id)
|
1219 |
if job:
|
1220 |
if job.end_timestamp is None: |
1221 |
if job.start_timestamp is None: |
1222 |
job_age = job.received_timestamp |
1223 |
else:
|
1224 |
job_age = job.start_timestamp |
1225 |
else:
|
1226 |
job_age = job.end_timestamp |
1227 |
|
1228 |
if age == -1 or now - job_age[0] > age: |
1229 |
pending.append(job) |
1230 |
|
1231 |
# Archive 10 jobs at a time
|
1232 |
if len(pending) >= 10: |
1233 |
archived_count += self._ArchiveJobsUnlocked(pending)
|
1234 |
pending = [] |
1235 |
|
1236 |
if pending:
|
1237 |
archived_count += self._ArchiveJobsUnlocked(pending)
|
1238 |
|
1239 |
return (archived_count, len(all_job_ids) - last_touched - 1) |
1240 |
|
1241 |
def _GetJobInfoUnlocked(self, job, fields): |
1242 |
"""Returns information about a job.
|
1243 |
|
1244 |
@type job: L{_QueuedJob}
|
1245 |
@param job: the job which we query
|
1246 |
@type fields: list
|
1247 |
@param fields: names of fields to return
|
1248 |
@rtype: list
|
1249 |
@return: list with one element for each field
|
1250 |
@raise errors.OpExecError: when an invalid field
|
1251 |
has been passed
|
1252 |
|
1253 |
"""
|
1254 |
row = [] |
1255 |
for fname in fields: |
1256 |
if fname == "id": |
1257 |
row.append(job.id) |
1258 |
elif fname == "status": |
1259 |
row.append(job.CalcStatus()) |
1260 |
elif fname == "ops": |
1261 |
row.append([op.input.__getstate__() for op in job.ops]) |
1262 |
elif fname == "opresult": |
1263 |
row.append([op.result for op in job.ops]) |
1264 |
elif fname == "opstatus": |
1265 |
row.append([op.status for op in job.ops]) |
1266 |
elif fname == "oplog": |
1267 |
row.append([op.log for op in job.ops]) |
1268 |
elif fname == "opstart": |
1269 |
row.append([op.start_timestamp for op in job.ops]) |
1270 |
elif fname == "opend": |
1271 |
row.append([op.end_timestamp for op in job.ops]) |
1272 |
elif fname == "received_ts": |
1273 |
row.append(job.received_timestamp) |
1274 |
elif fname == "start_ts": |
1275 |
row.append(job.start_timestamp) |
1276 |
elif fname == "end_ts": |
1277 |
row.append(job.end_timestamp) |
1278 |
elif fname == "summary": |
1279 |
row.append([op.input.Summary() for op in job.ops]) |
1280 |
else:
|
1281 |
raise errors.OpExecError("Invalid job query field '%s'" % fname) |
1282 |
return row
|
1283 |
|
1284 |
@utils.LockedMethod
|
1285 |
@_RequireOpenQueue
|
1286 |
def QueryJobs(self, job_ids, fields): |
1287 |
"""Returns a list of jobs in queue.
|
1288 |
|
1289 |
This is a wrapper of L{_GetJobsUnlocked}, which actually does the
|
1290 |
processing for each job.
|
1291 |
|
1292 |
@type job_ids: list
|
1293 |
@param job_ids: sequence of job identifiers or None for all
|
1294 |
@type fields: list
|
1295 |
@param fields: names of fields to return
|
1296 |
@rtype: list
|
1297 |
@return: list one element per job, each element being list with
|
1298 |
the requested fields
|
1299 |
|
1300 |
"""
|
1301 |
jobs = [] |
1302 |
|
1303 |
for job in self._GetJobsUnlocked(job_ids): |
1304 |
if job is None: |
1305 |
jobs.append(None)
|
1306 |
else:
|
1307 |
jobs.append(self._GetJobInfoUnlocked(job, fields))
|
1308 |
|
1309 |
return jobs
|
1310 |
|
1311 |
@utils.LockedMethod
|
1312 |
@_RequireOpenQueue
|
1313 |
def Shutdown(self): |
1314 |
"""Stops the job queue.
|
1315 |
|
1316 |
This shutdowns all the worker threads an closes the queue.
|
1317 |
|
1318 |
"""
|
1319 |
self._wpool.TerminateWorkers()
|
1320 |
|
1321 |
self._queue_lock.Close()
|
1322 |
self._queue_lock = None |