root / lib / mcpu.py @ 355d1f32
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# Copyright (C) 2006, 2007, 2011, 2012 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 logic behind the cluster operations
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This module implements the logic for doing operations in the cluster. There
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are two kinds of classes defined:
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- logical units, which know how to deal with their specific opcode only
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- the processor, which dispatches the opcodes to their logical units
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"""
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import sys |
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import logging |
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import random |
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import time |
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import itertools |
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import traceback |
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from ganeti import opcodes |
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from ganeti import opcodes_base |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import hooksmaster |
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from ganeti import cmdlib |
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from ganeti import locking |
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from ganeti import utils |
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from ganeti import compat |
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_OP_PREFIX = "Op"
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_LU_PREFIX = "LU"
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#: LU classes which don't need to acquire the node allocation lock
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#: (L{locking.NAL}) when they acquire all node or node resource locks
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_NODE_ALLOC_WHITELIST = frozenset([])
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#: LU classes which don't need to acquire the node allocation lock
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#: (L{locking.NAL}) in the same mode (shared/exclusive) as the node
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#: or node resource locks
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_NODE_ALLOC_MODE_WHITELIST = compat.UniqueFrozenset([ |
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cmdlib.LUBackupExport, |
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cmdlib.LUBackupRemove, |
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cmdlib.LUOobCommand, |
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]) |
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class LockAcquireTimeout(Exception): |
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"""Exception to report timeouts on acquiring locks.
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"""
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def _CalculateLockAttemptTimeouts(): |
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"""Calculate timeouts for lock attempts.
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"""
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result = [constants.LOCK_ATTEMPTS_MINWAIT] |
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running_sum = result[0]
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# Wait for a total of at least LOCK_ATTEMPTS_TIMEOUT before doing a
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# blocking acquire
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while running_sum < constants.LOCK_ATTEMPTS_TIMEOUT:
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timeout = (result[-1] * 1.05) ** 1.25 |
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# Cap max timeout. This gives other jobs a chance to run even if
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# we're still trying to get our locks, before finally moving to a
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# blocking acquire.
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timeout = min(timeout, constants.LOCK_ATTEMPTS_MAXWAIT)
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# And also cap the lower boundary for safety
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timeout = max(timeout, constants.LOCK_ATTEMPTS_MINWAIT)
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result.append(timeout) |
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running_sum += timeout |
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return result
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class LockAttemptTimeoutStrategy(object): |
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"""Class with lock acquire timeout strategy.
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"""
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__slots__ = [ |
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"_timeouts",
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"_random_fn",
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"_time_fn",
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] |
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_TIMEOUT_PER_ATTEMPT = _CalculateLockAttemptTimeouts() |
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def __init__(self, _time_fn=time.time, _random_fn=random.random): |
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"""Initializes this class.
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@param _time_fn: Time function for unittests
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@param _random_fn: Random number generator for unittests
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"""
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object.__init__(self) |
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self._timeouts = iter(self._TIMEOUT_PER_ATTEMPT) |
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self._time_fn = _time_fn
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self._random_fn = _random_fn
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def NextAttempt(self): |
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"""Returns the timeout for the next attempt.
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"""
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try:
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timeout = self._timeouts.next()
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except StopIteration: |
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# No more timeouts, do blocking acquire
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timeout = None
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if timeout is not None: |
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# Add a small variation (-/+ 5%) to timeout. This helps in situations
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# where two or more jobs are fighting for the same lock(s).
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variation_range = timeout * 0.1
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timeout += ((self._random_fn() * variation_range) -
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(variation_range * 0.5))
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return timeout
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class OpExecCbBase: # pylint: disable=W0232 |
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"""Base class for OpCode execution callbacks.
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"""
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def NotifyStart(self): |
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"""Called when we are about to execute the LU.
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This function is called when we're about to start the lu's Exec() method,
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that is, after we have acquired all locks.
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"""
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def Feedback(self, *args): |
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"""Sends feedback from the LU code to the end-user.
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"""
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def CurrentPriority(self): # pylint: disable=R0201 |
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"""Returns current priority or C{None}.
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"""
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return None |
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def SubmitManyJobs(self, jobs): |
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"""Submits jobs for processing.
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See L{jqueue.JobQueue.SubmitManyJobs}.
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"""
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raise NotImplementedError |
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def _LUNameForOpName(opname): |
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"""Computes the LU name for a given OpCode name.
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"""
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assert opname.startswith(_OP_PREFIX), \
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"Invalid OpCode name, doesn't start with %s: %s" % (_OP_PREFIX, opname)
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return _LU_PREFIX + opname[len(_OP_PREFIX):] |
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def _ComputeDispatchTable(): |
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"""Computes the opcode-to-lu dispatch table.
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"""
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return dict((op, getattr(cmdlib, _LUNameForOpName(op.__name__))) |
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for op in opcodes.OP_MAPPING.values() |
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if op.WITH_LU)
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def _SetBaseOpParams(src, defcomment, dst): |
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"""Copies basic opcode parameters.
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@type src: L{opcodes.OpCode}
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@param src: Source opcode
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@type defcomment: string
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@param defcomment: Comment to specify if not already given
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@type dst: L{opcodes.OpCode}
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@param dst: Destination opcode
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"""
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if hasattr(src, "debug_level"): |
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dst.debug_level = src.debug_level |
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if (getattr(dst, "priority", None) is None and |
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hasattr(src, "priority")): |
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dst.priority = src.priority |
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if not getattr(dst, opcodes_base.COMMENT_ATTR, None): |
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dst.comment = defcomment |
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def _ProcessResult(submit_fn, op, result): |
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"""Examines opcode result.
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If necessary, additional processing on the result is done.
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"""
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if isinstance(result, cmdlib.ResultWithJobs): |
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# Copy basic parameters (e.g. priority)
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map(compat.partial(_SetBaseOpParams, op,
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"Submitted by %s" % op.OP_ID),
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itertools.chain(*result.jobs)) |
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# Submit jobs
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job_submission = submit_fn(result.jobs) |
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# Build dictionary
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result = result.other |
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assert constants.JOB_IDS_KEY not in result, \ |
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"Key '%s' found in additional return values" % constants.JOB_IDS_KEY
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result[constants.JOB_IDS_KEY] = job_submission |
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return result
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def _FailingSubmitManyJobs(_): |
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"""Implementation of L{OpExecCbBase.SubmitManyJobs} to raise an exception.
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"""
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raise errors.ProgrammerError("Opcodes processed without callbacks (e.g." |
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" queries) can not submit jobs")
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def _VerifyLocks(lu, glm, _mode_whitelist=_NODE_ALLOC_MODE_WHITELIST, |
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_nal_whitelist=_NODE_ALLOC_WHITELIST): |
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"""Performs consistency checks on locks acquired by a logical unit.
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@type lu: L{cmdlib.LogicalUnit}
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@param lu: Logical unit instance
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@type glm: L{locking.GanetiLockManager}
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@param glm: Lock manager
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"""
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if not __debug__: |
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return
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have_nal = glm.check_owned(locking.LEVEL_NODE_ALLOC, locking.NAL) |
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for level in [locking.LEVEL_NODE, locking.LEVEL_NODE_RES]: |
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# TODO: Verify using actual lock mode, not using LU variables
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if level in lu.needed_locks: |
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share_node_alloc = lu.share_locks[locking.LEVEL_NODE_ALLOC] |
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share_level = lu.share_locks[level] |
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if lu.__class__ in _mode_whitelist: |
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assert share_node_alloc != share_level, \
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"LU is whitelisted to use different modes for node allocation lock"
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else:
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assert bool(share_node_alloc) == bool(share_level), \ |
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("Node allocation lock must be acquired using the same mode as nodes"
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" and node resources")
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if lu.__class__ in _nal_whitelist: |
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assert not have_nal, \ |
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"LU is whitelisted for not acquiring the node allocation lock"
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elif lu.needed_locks[level] == locking.ALL_SET or glm.owning_all(level): |
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assert have_nal, \
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("Node allocation lock must be used if an LU acquires all nodes"
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" or node resources")
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class Processor(object): |
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"""Object which runs OpCodes"""
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DISPATCH_TABLE = _ComputeDispatchTable() |
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def __init__(self, context, ec_id, enable_locks=True): |
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"""Constructor for Processor
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@type context: GanetiContext
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@param context: global Ganeti context
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@type ec_id: string
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@param ec_id: execution context identifier
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"""
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self.context = context
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self._ec_id = ec_id
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self._cbs = None |
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self.rpc = context.rpc
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self.hmclass = hooksmaster.HooksMaster
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self._enable_locks = enable_locks
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def _CheckLocksEnabled(self): |
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"""Checks if locking is enabled.
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@raise errors.ProgrammerError: In case locking is not enabled
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"""
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if not self._enable_locks: |
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raise errors.ProgrammerError("Attempted to use disabled locks") |
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def _AcquireLocks(self, level, names, shared, opportunistic, timeout): |
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"""Acquires locks via the Ganeti lock manager.
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@type level: int
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@param level: Lock level
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@type names: list or string
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@param names: Lock names
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@type shared: bool
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@param shared: Whether the locks should be acquired in shared mode
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@type opportunistic: bool
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@param opportunistic: Whether to acquire opportunistically
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@type timeout: None or float
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@param timeout: Timeout for acquiring the locks
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@raise LockAcquireTimeout: In case locks couldn't be acquired in specified
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amount of time
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"""
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self._CheckLocksEnabled()
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if self._cbs: |
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priority = self._cbs.CurrentPriority()
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else:
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priority = None
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acquired = self.context.glm.acquire(level, names, shared=shared,
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timeout=timeout, priority=priority, |
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opportunistic=opportunistic) |
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if acquired is None: |
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raise LockAcquireTimeout()
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return acquired
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def _ExecLU(self, lu): |
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"""Logical Unit execution sequence.
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"""
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write_count = self.context.cfg.write_count
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lu.CheckPrereq() |
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hm = self.BuildHooksManager(lu)
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h_results = hm.RunPhase(constants.HOOKS_PHASE_PRE) |
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lu.HooksCallBack(constants.HOOKS_PHASE_PRE, h_results, |
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self.Log, None) |
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if getattr(lu.op, "dry_run", False): |
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# in this mode, no post-hooks are run, and the config is not
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# written (as it might have been modified by another LU, and we
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# shouldn't do writeout on behalf of other threads
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self.LogInfo("dry-run mode requested, not actually executing" |
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" the operation")
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return lu.dry_run_result
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if self._cbs: |
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submit_mj_fn = self._cbs.SubmitManyJobs
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else:
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submit_mj_fn = _FailingSubmitManyJobs |
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try:
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result = _ProcessResult(submit_mj_fn, lu.op, lu.Exec(self.Log))
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h_results = hm.RunPhase(constants.HOOKS_PHASE_POST) |
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result = lu.HooksCallBack(constants.HOOKS_PHASE_POST, h_results, |
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self.Log, result)
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finally:
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# FIXME: This needs locks if not lu_class.REQ_BGL
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if write_count != self.context.cfg.write_count: |
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hm.RunConfigUpdate() |
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return result
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def BuildHooksManager(self, lu): |
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return self.hmclass.BuildFromLu(lu.rpc.call_hooks_runner, lu) |
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def _LockAndExecLU(self, lu, level, calc_timeout): |
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"""Execute a Logical Unit, with the needed locks.
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This is a recursive function that starts locking the given level, and
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proceeds up, till there are no more locks to acquire. Then it executes the
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given LU and its opcodes.
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"""
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glm = self.context.glm
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adding_locks = level in lu.add_locks
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acquiring_locks = level in lu.needed_locks
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if level not in locking.LEVELS: |
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_VerifyLocks(lu, glm) |
403 |
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if self._cbs: |
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self._cbs.NotifyStart()
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try:
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result = self._ExecLU(lu)
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except AssertionError, err: |
410 |
# this is a bit ugly, as we don't know from which phase
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# (prereq, exec) this comes; but it's better than an exception
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# with no information
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(_, _, tb) = sys.exc_info() |
414 |
err_info = traceback.format_tb(tb) |
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del tb
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logging.exception("Detected AssertionError")
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raise errors.OpExecError("Internal assertion error: please report" |
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" this as a bug.\nError message: '%s';"
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" location:\n%s" % (str(err), err_info[-1])) |
420 |
|
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elif adding_locks and acquiring_locks: |
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# We could both acquire and add locks at the same level, but for now we
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# don't need this, so we'll avoid the complicated code needed.
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raise NotImplementedError("Can't declare locks to acquire when adding" |
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" others")
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|
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elif adding_locks or acquiring_locks: |
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self._CheckLocksEnabled()
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|
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lu.DeclareLocks(level) |
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share = lu.share_locks[level] |
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opportunistic = lu.opportunistic_locks[level] |
433 |
|
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try:
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assert adding_locks ^ acquiring_locks, \
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"Locks must be either added or acquired"
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if acquiring_locks:
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# Acquiring locks
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needed_locks = lu.needed_locks[level] |
441 |
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self._AcquireLocks(level, needed_locks, share, opportunistic,
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calc_timeout()) |
444 |
else:
|
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# Adding locks
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add_locks = lu.add_locks[level] |
447 |
lu.remove_locks[level] = add_locks |
448 |
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try:
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glm.add(level, add_locks, acquired=1, shared=share)
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except errors.LockError:
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logging.exception("Detected lock error in level %s for locks"
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" %s, shared=%s", level, add_locks, share)
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raise errors.OpPrereqError(
|
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"Couldn't add locks (%s), most likely because of another"
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" job who added them first" % add_locks,
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errors.ECODE_NOTUNIQUE) |
458 |
|
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try:
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result = self._LockAndExecLU(lu, level + 1, calc_timeout) |
461 |
finally:
|
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if level in lu.remove_locks: |
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glm.remove(level, lu.remove_locks[level]) |
464 |
finally:
|
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if glm.is_owned(level):
|
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glm.release(level) |
467 |
|
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else:
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result = self._LockAndExecLU(lu, level + 1, calc_timeout) |
470 |
|
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return result
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|
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# pylint: disable=R0201
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def _CheckLUResult(self, op, result): |
475 |
"""Check the LU result against the contract in the opcode.
|
476 |
|
477 |
"""
|
478 |
resultcheck_fn = op.OP_RESULT |
479 |
if not (resultcheck_fn is None or resultcheck_fn(result)): |
480 |
logging.error("Expected opcode result matching %s, got %s",
|
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resultcheck_fn, result) |
482 |
if not getattr(op, "dry_run", False): |
483 |
# FIXME: LUs should still behave in dry_run mode, or
|
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# alternately we should have OP_DRYRUN_RESULT; in the
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# meantime, we simply skip the OP_RESULT check in dry-run mode
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raise errors.OpResultError("Opcode result does not match %s: %s" % |
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(resultcheck_fn, utils.Truncate(result, 80)))
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|
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def ExecOpCode(self, op, cbs, timeout=None): |
490 |
"""Execute an opcode.
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|
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@type op: an OpCode instance
|
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@param op: the opcode to be executed
|
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@type cbs: L{OpExecCbBase}
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@param cbs: Runtime callbacks
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@type timeout: float or None
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@param timeout: Maximum time to acquire all locks, None for no timeout
|
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@raise LockAcquireTimeout: In case locks couldn't be acquired in specified
|
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amount of time
|
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|
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"""
|
502 |
if not isinstance(op, opcodes.OpCode): |
503 |
raise errors.ProgrammerError("Non-opcode instance passed" |
504 |
" to ExecOpcode (%s)" % type(op)) |
505 |
|
506 |
lu_class = self.DISPATCH_TABLE.get(op.__class__, None) |
507 |
if lu_class is None: |
508 |
raise errors.OpCodeUnknown("Unknown opcode") |
509 |
|
510 |
if timeout is None: |
511 |
calc_timeout = lambda: None |
512 |
else:
|
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calc_timeout = utils.RunningTimeout(timeout, False).Remaining
|
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|
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self._cbs = cbs
|
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try:
|
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if self._enable_locks: |
518 |
# Acquire the Big Ganeti Lock exclusively if this LU requires it,
|
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# and in a shared fashion otherwise (to prevent concurrent run with
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# an exclusive LU.
|
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self._AcquireLocks(locking.LEVEL_CLUSTER, locking.BGL,
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not lu_class.REQ_BGL, False, calc_timeout()) |
523 |
elif lu_class.REQ_BGL:
|
524 |
raise errors.ProgrammerError("Opcode '%s' requires BGL, but locks are" |
525 |
" disabled" % op.OP_ID)
|
526 |
|
527 |
try:
|
528 |
lu = lu_class(self, op, self.context, self.rpc) |
529 |
lu.ExpandNames() |
530 |
assert lu.needed_locks is not None, "needed_locks not set by LU" |
531 |
|
532 |
try:
|
533 |
result = self._LockAndExecLU(lu, locking.LEVEL_CLUSTER + 1, |
534 |
calc_timeout) |
535 |
finally:
|
536 |
if self._ec_id: |
537 |
self.context.cfg.DropECReservations(self._ec_id) |
538 |
finally:
|
539 |
# Release BGL if owned
|
540 |
if self.context.glm.is_owned(locking.LEVEL_CLUSTER): |
541 |
assert self._enable_locks |
542 |
self.context.glm.release(locking.LEVEL_CLUSTER)
|
543 |
finally:
|
544 |
self._cbs = None |
545 |
|
546 |
self._CheckLUResult(op, result)
|
547 |
|
548 |
return result
|
549 |
|
550 |
def Log(self, *args): |
551 |
"""Forward call to feedback callback function.
|
552 |
|
553 |
"""
|
554 |
if self._cbs: |
555 |
self._cbs.Feedback(*args)
|
556 |
|
557 |
def LogStep(self, current, total, message): |
558 |
"""Log a change in LU execution progress.
|
559 |
|
560 |
"""
|
561 |
logging.debug("Step %d/%d %s", current, total, message)
|
562 |
self.Log("STEP %d/%d %s" % (current, total, message)) |
563 |
|
564 |
def LogWarning(self, message, *args, **kwargs): |
565 |
"""Log a warning to the logs and the user.
|
566 |
|
567 |
The optional keyword argument is 'hint' and can be used to show a
|
568 |
hint to the user (presumably related to the warning). If the
|
569 |
message is empty, it will not be printed at all, allowing one to
|
570 |
show only a hint.
|
571 |
|
572 |
"""
|
573 |
assert not kwargs or (len(kwargs) == 1 and "hint" in kwargs), \ |
574 |
"Invalid keyword arguments for LogWarning (%s)" % str(kwargs) |
575 |
if args:
|
576 |
message = message % tuple(args)
|
577 |
if message:
|
578 |
logging.warning(message) |
579 |
self.Log(" - WARNING: %s" % message) |
580 |
if "hint" in kwargs: |
581 |
self.Log(" Hint: %s" % kwargs["hint"]) |
582 |
|
583 |
def LogInfo(self, message, *args): |
584 |
"""Log an informational message to the logs and the user.
|
585 |
|
586 |
"""
|
587 |
if args:
|
588 |
message = message % tuple(args)
|
589 |
logging.info(message) |
590 |
self.Log(" - INFO: %s" % message) |
591 |
|
592 |
def GetECId(self): |
593 |
"""Returns the current execution context ID.
|
594 |
|
595 |
"""
|
596 |
if not self._ec_id: |
597 |
raise errors.ProgrammerError("Tried to use execution context id when" |
598 |
" not set")
|
599 |
return self._ec_id |