root / lib / jqueue.py @ a8efbb40
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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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class CancelJob: |
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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.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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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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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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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.debug("Op %s/%s: Successfully finished %s",
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idx + 1, count, op)
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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.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 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.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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"""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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# 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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# 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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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): |
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# Give an update every 1000 jobs or 10 seconds
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if (idx % 1000 == 0 or time.time() >= (lastinfo + 10.0) or |
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idx == (jobs_count - 1)):
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logging.info("Job queue inspection: %d/%d (%0.1f %%)",
|
553 |
idx, jobs_count - 1, 100.0 * (idx + 1) / jobs_count) |
554 |
lastinfo = time.time() |
555 |
|
556 |
job = self._LoadJobUnlocked(job_id)
|
557 |
|
558 |
# a failure in loading the job can cause 'None' to be returned
|
559 |
if job is None: |
560 |
continue
|
561 |
|
562 |
status = job.CalcStatus() |
563 |
|
564 |
if status in (constants.JOB_STATUS_QUEUED, ): |
565 |
self._wpool.AddTask(job)
|
566 |
|
567 |
elif status in (constants.JOB_STATUS_RUNNING, |
568 |
constants.JOB_STATUS_WAITLOCK, |
569 |
constants.JOB_STATUS_CANCELING): |
570 |
logging.warning("Unfinished job %s found: %s", job.id, job)
|
571 |
try:
|
572 |
for op in job.ops: |
573 |
op.status = constants.OP_STATUS_ERROR |
574 |
op.result = "Unclean master daemon shutdown"
|
575 |
finally:
|
576 |
self.UpdateJobUnlocked(job)
|
577 |
|
578 |
logging.info("Job queue inspection finished")
|
579 |
finally:
|
580 |
self.release()
|
581 |
except:
|
582 |
self._wpool.TerminateWorkers()
|
583 |
raise
|
584 |
|
585 |
@utils.LockedMethod
|
586 |
@_RequireOpenQueue
|
587 |
def AddNode(self, node): |
588 |
"""Register a new node with the queue.
|
589 |
|
590 |
@type node: L{objects.Node}
|
591 |
@param node: the node object to be added
|
592 |
|
593 |
"""
|
594 |
node_name = node.name |
595 |
assert node_name != self._my_hostname |
596 |
|
597 |
# Clean queue directory on added node
|
598 |
rpc.RpcRunner.call_jobqueue_purge(node_name) |
599 |
|
600 |
if not node.master_candidate: |
601 |
# remove if existing, ignoring errors
|
602 |
self._nodes.pop(node_name, None) |
603 |
# and skip the replication of the job ids
|
604 |
return
|
605 |
|
606 |
# Upload the whole queue excluding archived jobs
|
607 |
files = [self._GetJobPath(job_id) for job_id in self._GetJobIDsUnlocked()] |
608 |
|
609 |
# Upload current serial file
|
610 |
files.append(constants.JOB_QUEUE_SERIAL_FILE) |
611 |
|
612 |
for file_name in files: |
613 |
# Read file content
|
614 |
fd = open(file_name, "r") |
615 |
try:
|
616 |
content = fd.read() |
617 |
finally:
|
618 |
fd.close() |
619 |
|
620 |
result = rpc.RpcRunner.call_jobqueue_update([node_name], |
621 |
[node.primary_ip], |
622 |
file_name, content) |
623 |
if not result[node_name]: |
624 |
logging.error("Failed to upload %s to %s", file_name, node_name)
|
625 |
|
626 |
self._nodes[node_name] = node.primary_ip
|
627 |
|
628 |
@utils.LockedMethod
|
629 |
@_RequireOpenQueue
|
630 |
def RemoveNode(self, node_name): |
631 |
"""Callback called when removing nodes from the cluster.
|
632 |
|
633 |
@type node_name: str
|
634 |
@param node_name: the name of the node to remove
|
635 |
|
636 |
"""
|
637 |
try:
|
638 |
# The queue is removed by the "leave node" RPC call.
|
639 |
del self._nodes[node_name] |
640 |
except KeyError: |
641 |
pass
|
642 |
|
643 |
def _CheckRpcResult(self, result, nodes, failmsg): |
644 |
"""Verifies the status of an RPC call.
|
645 |
|
646 |
Since we aim to keep consistency should this node (the current
|
647 |
master) fail, we will log errors if our rpc fail, and especially
|
648 |
log the case when more than half of the nodes failes.
|
649 |
|
650 |
@param result: the data as returned from the rpc call
|
651 |
@type nodes: list
|
652 |
@param nodes: the list of nodes we made the call to
|
653 |
@type failmsg: str
|
654 |
@param failmsg: the identifier to be used for logging
|
655 |
|
656 |
"""
|
657 |
failed = [] |
658 |
success = [] |
659 |
|
660 |
for node in nodes: |
661 |
if result[node]:
|
662 |
success.append(node) |
663 |
else:
|
664 |
failed.append(node) |
665 |
|
666 |
if failed:
|
667 |
logging.error("%s failed on %s", failmsg, ", ".join(failed)) |
668 |
|
669 |
# +1 for the master node
|
670 |
if (len(success) + 1) < len(failed): |
671 |
# TODO: Handle failing nodes
|
672 |
logging.error("More than half of the nodes failed")
|
673 |
|
674 |
def _GetNodeIp(self): |
675 |
"""Helper for returning the node name/ip list.
|
676 |
|
677 |
@rtype: (list, list)
|
678 |
@return: a tuple of two lists, the first one with the node
|
679 |
names and the second one with the node addresses
|
680 |
|
681 |
"""
|
682 |
name_list = self._nodes.keys()
|
683 |
addr_list = [self._nodes[name] for name in name_list] |
684 |
return name_list, addr_list
|
685 |
|
686 |
def _WriteAndReplicateFileUnlocked(self, file_name, data): |
687 |
"""Writes a file locally and then replicates it to all nodes.
|
688 |
|
689 |
This function will replace the contents of a file on the local
|
690 |
node and then replicate it to all the other nodes we have.
|
691 |
|
692 |
@type file_name: str
|
693 |
@param file_name: the path of the file to be replicated
|
694 |
@type data: str
|
695 |
@param data: the new contents of the file
|
696 |
|
697 |
"""
|
698 |
utils.WriteFile(file_name, data=data) |
699 |
|
700 |
names, addrs = self._GetNodeIp()
|
701 |
result = rpc.RpcRunner.call_jobqueue_update(names, addrs, file_name, data) |
702 |
self._CheckRpcResult(result, self._nodes, |
703 |
"Updating %s" % file_name)
|
704 |
|
705 |
def _RenameFileUnlocked(self, old, new): |
706 |
"""Renames a file locally and then replicate the change.
|
707 |
|
708 |
This function will rename a file in the local queue directory
|
709 |
and then replicate this rename to all the other nodes we have.
|
710 |
|
711 |
@type old: str
|
712 |
@param old: the current name of the file
|
713 |
@type new: str
|
714 |
@param new: the new name of the file
|
715 |
|
716 |
"""
|
717 |
os.rename(old, new) |
718 |
|
719 |
names, addrs = self._GetNodeIp()
|
720 |
result = rpc.RpcRunner.call_jobqueue_rename(names, addrs, old, new) |
721 |
self._CheckRpcResult(result, self._nodes, |
722 |
"Moving %s to %s" % (old, new))
|
723 |
|
724 |
def _FormatJobID(self, job_id): |
725 |
"""Convert a job ID to string format.
|
726 |
|
727 |
Currently this just does C{str(job_id)} after performing some
|
728 |
checks, but if we want to change the job id format this will
|
729 |
abstract this change.
|
730 |
|
731 |
@type job_id: int or long
|
732 |
@param job_id: the numeric job id
|
733 |
@rtype: str
|
734 |
@return: the formatted job id
|
735 |
|
736 |
"""
|
737 |
if not isinstance(job_id, (int, long)): |
738 |
raise errors.ProgrammerError("Job ID '%s' not numeric" % job_id) |
739 |
if job_id < 0: |
740 |
raise errors.ProgrammerError("Job ID %s is negative" % job_id) |
741 |
|
742 |
return str(job_id) |
743 |
|
744 |
def _NewSerialUnlocked(self): |
745 |
"""Generates a new job identifier.
|
746 |
|
747 |
Job identifiers are unique during the lifetime of a cluster.
|
748 |
|
749 |
@rtype: str
|
750 |
@return: a string representing the job identifier.
|
751 |
|
752 |
"""
|
753 |
# New number
|
754 |
serial = self._last_serial + 1 |
755 |
|
756 |
# Write to file
|
757 |
self._WriteAndReplicateFileUnlocked(constants.JOB_QUEUE_SERIAL_FILE,
|
758 |
"%s\n" % serial)
|
759 |
|
760 |
# Keep it only if we were able to write the file
|
761 |
self._last_serial = serial
|
762 |
|
763 |
return self._FormatJobID(serial) |
764 |
|
765 |
@staticmethod
|
766 |
def _GetJobPath(job_id): |
767 |
"""Returns the job file for a given job id.
|
768 |
|
769 |
@type job_id: str
|
770 |
@param job_id: the job identifier
|
771 |
@rtype: str
|
772 |
@return: the path to the job file
|
773 |
|
774 |
"""
|
775 |
return os.path.join(constants.QUEUE_DIR, "job-%s" % job_id) |
776 |
|
777 |
@staticmethod
|
778 |
def _GetArchivedJobPath(job_id): |
779 |
"""Returns the archived job file for a give job id.
|
780 |
|
781 |
@type job_id: str
|
782 |
@param job_id: the job identifier
|
783 |
@rtype: str
|
784 |
@return: the path to the archived job file
|
785 |
|
786 |
"""
|
787 |
return os.path.join(constants.JOB_QUEUE_ARCHIVE_DIR, "job-%s" % job_id) |
788 |
|
789 |
@classmethod
|
790 |
def _ExtractJobID(cls, name): |
791 |
"""Extract the job id from a filename.
|
792 |
|
793 |
@type name: str
|
794 |
@param name: the job filename
|
795 |
@rtype: job id or None
|
796 |
@return: the job id corresponding to the given filename,
|
797 |
or None if the filename does not represent a valid
|
798 |
job file
|
799 |
|
800 |
"""
|
801 |
m = cls._RE_JOB_FILE.match(name) |
802 |
if m:
|
803 |
return m.group(1) |
804 |
else:
|
805 |
return None |
806 |
|
807 |
def _GetJobIDsUnlocked(self, archived=False): |
808 |
"""Return all known job IDs.
|
809 |
|
810 |
If the parameter archived is True, archived jobs IDs will be
|
811 |
included. Currently this argument is unused.
|
812 |
|
813 |
The method only looks at disk because it's a requirement that all
|
814 |
jobs are present on disk (so in the _memcache we don't have any
|
815 |
extra IDs).
|
816 |
|
817 |
@rtype: list
|
818 |
@return: the list of job IDs
|
819 |
|
820 |
"""
|
821 |
jlist = [self._ExtractJobID(name) for name in self._ListJobFiles()] |
822 |
jlist = utils.NiceSort(jlist) |
823 |
return jlist
|
824 |
|
825 |
def _ListJobFiles(self): |
826 |
"""Returns the list of current job files.
|
827 |
|
828 |
@rtype: list
|
829 |
@return: the list of job file names
|
830 |
|
831 |
"""
|
832 |
return [name for name in utils.ListVisibleFiles(constants.QUEUE_DIR) |
833 |
if self._RE_JOB_FILE.match(name)] |
834 |
|
835 |
def _LoadJobUnlocked(self, job_id): |
836 |
"""Loads a job from the disk or memory.
|
837 |
|
838 |
Given a job id, this will return the cached job object if
|
839 |
existing, or try to load the job from the disk. If loading from
|
840 |
disk, it will also add the job to the cache.
|
841 |
|
842 |
@param job_id: the job id
|
843 |
@rtype: L{_QueuedJob} or None
|
844 |
@return: either None or the job object
|
845 |
|
846 |
"""
|
847 |
job = self._memcache.get(job_id, None) |
848 |
if job:
|
849 |
logging.debug("Found job %s in memcache", job_id)
|
850 |
return job
|
851 |
|
852 |
filepath = self._GetJobPath(job_id)
|
853 |
logging.debug("Loading job from %s", filepath)
|
854 |
try:
|
855 |
fd = open(filepath, "r") |
856 |
except IOError, err: |
857 |
if err.errno in (errno.ENOENT, ): |
858 |
return None |
859 |
raise
|
860 |
try:
|
861 |
data = serializer.LoadJson(fd.read()) |
862 |
finally:
|
863 |
fd.close() |
864 |
|
865 |
try:
|
866 |
job = _QueuedJob.Restore(self, data)
|
867 |
except Exception, err: |
868 |
new_path = self._GetArchivedJobPath(job_id)
|
869 |
if filepath == new_path:
|
870 |
# job already archived (future case)
|
871 |
logging.exception("Can't parse job %s", job_id)
|
872 |
else:
|
873 |
# non-archived case
|
874 |
logging.exception("Can't parse job %s, will archive.", job_id)
|
875 |
self._RenameFileUnlocked(filepath, new_path)
|
876 |
return None |
877 |
|
878 |
self._memcache[job_id] = job
|
879 |
logging.debug("Added job %s to the cache", job_id)
|
880 |
return job
|
881 |
|
882 |
def _GetJobsUnlocked(self, job_ids): |
883 |
"""Return a list of jobs based on their IDs.
|
884 |
|
885 |
@type job_ids: list
|
886 |
@param job_ids: either an empty list (meaning all jobs),
|
887 |
or a list of job IDs
|
888 |
@rtype: list
|
889 |
@return: the list of job objects
|
890 |
|
891 |
"""
|
892 |
if not job_ids: |
893 |
job_ids = self._GetJobIDsUnlocked()
|
894 |
|
895 |
return [self._LoadJobUnlocked(job_id) for job_id in job_ids] |
896 |
|
897 |
@staticmethod
|
898 |
def _IsQueueMarkedDrain(): |
899 |
"""Check if the queue is marked from drain.
|
900 |
|
901 |
This currently uses the queue drain file, which makes it a
|
902 |
per-node flag. In the future this can be moved to the config file.
|
903 |
|
904 |
@rtype: boolean
|
905 |
@return: True of the job queue is marked for draining
|
906 |
|
907 |
"""
|
908 |
return os.path.exists(constants.JOB_QUEUE_DRAIN_FILE)
|
909 |
|
910 |
@staticmethod
|
911 |
def SetDrainFlag(drain_flag): |
912 |
"""Sets the drain flag for the queue.
|
913 |
|
914 |
This is similar to the function L{backend.JobQueueSetDrainFlag},
|
915 |
and in the future we might merge them.
|
916 |
|
917 |
@type drain_flag: boolean
|
918 |
@param drain_flag: wheter to set or unset the drain flag
|
919 |
|
920 |
"""
|
921 |
if drain_flag:
|
922 |
utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True) |
923 |
else:
|
924 |
utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE) |
925 |
return True |
926 |
|
927 |
@utils.LockedMethod
|
928 |
@_RequireOpenQueue
|
929 |
def SubmitJob(self, ops): |
930 |
"""Create and store a new job.
|
931 |
|
932 |
This enters the job into our job queue and also puts it on the new
|
933 |
queue, in order for it to be picked up by the queue processors.
|
934 |
|
935 |
@type ops: list
|
936 |
@param ops: The list of OpCodes that will become the new job.
|
937 |
@rtype: job ID
|
938 |
@return: the job ID of the newly created job
|
939 |
@raise errors.JobQueueDrainError: if the job is marked for draining
|
940 |
|
941 |
"""
|
942 |
if self._IsQueueMarkedDrain(): |
943 |
raise errors.JobQueueDrainError()
|
944 |
# Get job identifier
|
945 |
job_id = self._NewSerialUnlocked()
|
946 |
job = _QueuedJob(self, job_id, ops)
|
947 |
|
948 |
# Write to disk
|
949 |
self.UpdateJobUnlocked(job)
|
950 |
|
951 |
logging.debug("Adding new job %s to the cache", job_id)
|
952 |
self._memcache[job_id] = job
|
953 |
|
954 |
# Add to worker pool
|
955 |
self._wpool.AddTask(job)
|
956 |
|
957 |
return job.id
|
958 |
|
959 |
@_RequireOpenQueue
|
960 |
def UpdateJobUnlocked(self, job): |
961 |
"""Update a job's on disk storage.
|
962 |
|
963 |
After a job has been modified, this function needs to be called in
|
964 |
order to write the changes to disk and replicate them to the other
|
965 |
nodes.
|
966 |
|
967 |
@type job: L{_QueuedJob}
|
968 |
@param job: the changed job
|
969 |
|
970 |
"""
|
971 |
filename = self._GetJobPath(job.id)
|
972 |
data = serializer.DumpJson(job.Serialize(), indent=False)
|
973 |
logging.debug("Writing job %s to %s", job.id, filename)
|
974 |
self._WriteAndReplicateFileUnlocked(filename, data)
|
975 |
|
976 |
# Notify waiters about potential changes
|
977 |
job.change.notifyAll() |
978 |
|
979 |
@utils.LockedMethod
|
980 |
@_RequireOpenQueue
|
981 |
def WaitForJobChanges(self, job_id, fields, prev_job_info, prev_log_serial, |
982 |
timeout): |
983 |
"""Waits for changes in a job.
|
984 |
|
985 |
@type job_id: string
|
986 |
@param job_id: Job identifier
|
987 |
@type fields: list of strings
|
988 |
@param fields: Which fields to check for changes
|
989 |
@type prev_job_info: list or None
|
990 |
@param prev_job_info: Last job information returned
|
991 |
@type prev_log_serial: int
|
992 |
@param prev_log_serial: Last job message serial number
|
993 |
@type timeout: float
|
994 |
@param timeout: maximum time to wait
|
995 |
@rtype: tuple (job info, log entries)
|
996 |
@return: a tuple of the job information as required via
|
997 |
the fields parameter, and the log entries as a list
|
998 |
|
999 |
if the job has not changed and the timeout has expired,
|
1000 |
we instead return a special value,
|
1001 |
L{constants.JOB_NOTCHANGED}, which should be interpreted
|
1002 |
as such by the clients
|
1003 |
|
1004 |
"""
|
1005 |
logging.debug("Waiting for changes in job %s", job_id)
|
1006 |
end_time = time.time() + timeout |
1007 |
while True: |
1008 |
delta_time = end_time - time.time() |
1009 |
if delta_time < 0: |
1010 |
return constants.JOB_NOTCHANGED
|
1011 |
|
1012 |
job = self._LoadJobUnlocked(job_id)
|
1013 |
if not job: |
1014 |
logging.debug("Job %s not found", job_id)
|
1015 |
break
|
1016 |
|
1017 |
status = job.CalcStatus() |
1018 |
job_info = self._GetJobInfoUnlocked(job, fields)
|
1019 |
log_entries = job.GetLogEntries(prev_log_serial) |
1020 |
|
1021 |
# Serializing and deserializing data can cause type changes (e.g. from
|
1022 |
# tuple to list) or precision loss. We're doing it here so that we get
|
1023 |
# the same modifications as the data received from the client. Without
|
1024 |
# this, the comparison afterwards might fail without the data being
|
1025 |
# significantly different.
|
1026 |
job_info = serializer.LoadJson(serializer.DumpJson(job_info)) |
1027 |
log_entries = serializer.LoadJson(serializer.DumpJson(log_entries)) |
1028 |
|
1029 |
if status not in (constants.JOB_STATUS_QUEUED, |
1030 |
constants.JOB_STATUS_RUNNING, |
1031 |
constants.JOB_STATUS_WAITLOCK): |
1032 |
# Don't even try to wait if the job is no longer running, there will be
|
1033 |
# no changes.
|
1034 |
break
|
1035 |
|
1036 |
if (prev_job_info != job_info or |
1037 |
(log_entries and prev_log_serial != log_entries[0][0])): |
1038 |
break
|
1039 |
|
1040 |
logging.debug("Waiting again")
|
1041 |
|
1042 |
# Release the queue lock while waiting
|
1043 |
job.change.wait(delta_time) |
1044 |
|
1045 |
logging.debug("Job %s changed", job_id)
|
1046 |
|
1047 |
return (job_info, log_entries)
|
1048 |
|
1049 |
@utils.LockedMethod
|
1050 |
@_RequireOpenQueue
|
1051 |
def CancelJob(self, job_id): |
1052 |
"""Cancels a job.
|
1053 |
|
1054 |
This will only succeed if the job has not started yet.
|
1055 |
|
1056 |
@type job_id: string
|
1057 |
@param job_id: job ID of job to be cancelled.
|
1058 |
|
1059 |
"""
|
1060 |
logging.info("Cancelling job %s", job_id)
|
1061 |
|
1062 |
job = self._LoadJobUnlocked(job_id)
|
1063 |
if not job: |
1064 |
logging.debug("Job %s not found", job_id)
|
1065 |
return (False, "Job %s not found" % job_id) |
1066 |
|
1067 |
job_status = job.CalcStatus() |
1068 |
|
1069 |
if job_status not in (constants.JOB_STATUS_QUEUED, |
1070 |
constants.JOB_STATUS_WAITLOCK): |
1071 |
logging.debug("Job %s is no longer in the queue", job.id)
|
1072 |
return (False, "Job %s is no longer in the queue" % job.id) |
1073 |
|
1074 |
if job_status == constants.JOB_STATUS_QUEUED:
|
1075 |
self.CancelJobUnlocked(job)
|
1076 |
return (True, "Job %s canceled" % job.id) |
1077 |
|
1078 |
elif job_status == constants.JOB_STATUS_WAITLOCK:
|
1079 |
# The worker will notice the new status and cancel the job
|
1080 |
try:
|
1081 |
for op in job.ops: |
1082 |
op.status = constants.OP_STATUS_CANCELING |
1083 |
finally:
|
1084 |
self.UpdateJobUnlocked(job)
|
1085 |
return (True, "Job %s will be canceled" % job.id) |
1086 |
|
1087 |
@_RequireOpenQueue
|
1088 |
def CancelJobUnlocked(self, job): |
1089 |
"""Marks a job as canceled.
|
1090 |
|
1091 |
"""
|
1092 |
try:
|
1093 |
for op in job.ops: |
1094 |
op.status = constants.OP_STATUS_ERROR |
1095 |
op.result = "Job canceled by request"
|
1096 |
finally:
|
1097 |
self.UpdateJobUnlocked(job)
|
1098 |
|
1099 |
@_RequireOpenQueue
|
1100 |
def _ArchiveJobUnlocked(self, job_id): |
1101 |
"""Archives a job.
|
1102 |
|
1103 |
@type job_id: string
|
1104 |
@param job_id: Job ID of job to be archived.
|
1105 |
|
1106 |
"""
|
1107 |
logging.info("Archiving job %s", job_id)
|
1108 |
|
1109 |
job = self._LoadJobUnlocked(job_id)
|
1110 |
if not job: |
1111 |
logging.debug("Job %s not found", job_id)
|
1112 |
return
|
1113 |
|
1114 |
if job.CalcStatus() not in (constants.JOB_STATUS_CANCELED, |
1115 |
constants.JOB_STATUS_SUCCESS, |
1116 |
constants.JOB_STATUS_ERROR): |
1117 |
logging.debug("Job %s is not yet done", job.id)
|
1118 |
return
|
1119 |
|
1120 |
old = self._GetJobPath(job.id)
|
1121 |
new = self._GetArchivedJobPath(job.id)
|
1122 |
|
1123 |
self._RenameFileUnlocked(old, new)
|
1124 |
|
1125 |
logging.debug("Successfully archived job %s", job.id)
|
1126 |
|
1127 |
@utils.LockedMethod
|
1128 |
@_RequireOpenQueue
|
1129 |
def ArchiveJob(self, job_id): |
1130 |
"""Archives a job.
|
1131 |
|
1132 |
This is just a wrapper over L{_ArchiveJobUnlocked}.
|
1133 |
|
1134 |
@type job_id: string
|
1135 |
@param job_id: Job ID of job to be archived.
|
1136 |
|
1137 |
"""
|
1138 |
return self._ArchiveJobUnlocked(job_id) |
1139 |
|
1140 |
@utils.LockedMethod
|
1141 |
@_RequireOpenQueue
|
1142 |
def AutoArchiveJobs(self, age): |
1143 |
"""Archives all jobs based on age.
|
1144 |
|
1145 |
The method will archive all jobs which are older than the age
|
1146 |
parameter. For jobs that don't have an end timestamp, the start
|
1147 |
timestamp will be considered. The special '-1' age will cause
|
1148 |
archival of all jobs (that are not running or queued).
|
1149 |
|
1150 |
@type age: int
|
1151 |
@param age: the minimum age in seconds
|
1152 |
|
1153 |
"""
|
1154 |
logging.info("Archiving jobs with age more than %s seconds", age)
|
1155 |
|
1156 |
now = time.time() |
1157 |
for jid in self._GetJobIDsUnlocked(archived=False): |
1158 |
job = self._LoadJobUnlocked(jid)
|
1159 |
if job.CalcStatus() not in (constants.OP_STATUS_SUCCESS, |
1160 |
constants.OP_STATUS_ERROR, |
1161 |
constants.OP_STATUS_CANCELED): |
1162 |
continue
|
1163 |
if job.end_timestamp is None: |
1164 |
if job.start_timestamp is None: |
1165 |
job_age = job.received_timestamp |
1166 |
else:
|
1167 |
job_age = job.start_timestamp |
1168 |
else:
|
1169 |
job_age = job.end_timestamp |
1170 |
|
1171 |
if age == -1 or now - job_age[0] > age: |
1172 |
self._ArchiveJobUnlocked(jid)
|
1173 |
|
1174 |
def _GetJobInfoUnlocked(self, job, fields): |
1175 |
"""Returns information about a job.
|
1176 |
|
1177 |
@type job: L{_QueuedJob}
|
1178 |
@param job: the job which we query
|
1179 |
@type fields: list
|
1180 |
@param fields: names of fields to return
|
1181 |
@rtype: list
|
1182 |
@return: list with one element for each field
|
1183 |
@raise errors.OpExecError: when an invalid field
|
1184 |
has been passed
|
1185 |
|
1186 |
"""
|
1187 |
row = [] |
1188 |
for fname in fields: |
1189 |
if fname == "id": |
1190 |
row.append(job.id) |
1191 |
elif fname == "status": |
1192 |
row.append(job.CalcStatus()) |
1193 |
elif fname == "ops": |
1194 |
row.append([op.input.__getstate__() for op in job.ops]) |
1195 |
elif fname == "opresult": |
1196 |
row.append([op.result for op in job.ops]) |
1197 |
elif fname == "opstatus": |
1198 |
row.append([op.status for op in job.ops]) |
1199 |
elif fname == "oplog": |
1200 |
row.append([op.log for op in job.ops]) |
1201 |
elif fname == "opstart": |
1202 |
row.append([op.start_timestamp for op in job.ops]) |
1203 |
elif fname == "opend": |
1204 |
row.append([op.end_timestamp for op in job.ops]) |
1205 |
elif fname == "received_ts": |
1206 |
row.append(job.received_timestamp) |
1207 |
elif fname == "start_ts": |
1208 |
row.append(job.start_timestamp) |
1209 |
elif fname == "end_ts": |
1210 |
row.append(job.end_timestamp) |
1211 |
elif fname == "summary": |
1212 |
row.append([op.input.Summary() for op in job.ops]) |
1213 |
else:
|
1214 |
raise errors.OpExecError("Invalid job query field '%s'" % fname) |
1215 |
return row
|
1216 |
|
1217 |
@utils.LockedMethod
|
1218 |
@_RequireOpenQueue
|
1219 |
def QueryJobs(self, job_ids, fields): |
1220 |
"""Returns a list of jobs in queue.
|
1221 |
|
1222 |
This is a wrapper of L{_GetJobsUnlocked}, which actually does the
|
1223 |
processing for each job.
|
1224 |
|
1225 |
@type job_ids: list
|
1226 |
@param job_ids: sequence of job identifiers or None for all
|
1227 |
@type fields: list
|
1228 |
@param fields: names of fields to return
|
1229 |
@rtype: list
|
1230 |
@return: list one element per job, each element being list with
|
1231 |
the requested fields
|
1232 |
|
1233 |
"""
|
1234 |
jobs = [] |
1235 |
|
1236 |
for job in self._GetJobsUnlocked(job_ids): |
1237 |
if job is None: |
1238 |
jobs.append(None)
|
1239 |
else:
|
1240 |
jobs.append(self._GetJobInfoUnlocked(job, fields))
|
1241 |
|
1242 |
return jobs
|
1243 |
|
1244 |
@utils.LockedMethod
|
1245 |
@_RequireOpenQueue
|
1246 |
def Shutdown(self): |
1247 |
"""Stops the job queue.
|
1248 |
|
1249 |
This shutdowns all the worker threads an closes the queue.
|
1250 |
|
1251 |
"""
|
1252 |
self._wpool.TerminateWorkers()
|
1253 |
|
1254 |
self._queue_lock.Close()
|
1255 |
self._queue_lock = None |