Module mcpu

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Module implementing the logic behind the cluster operations

This module implements the logic for doing operations in the cluster. There are two kinds of classes defined:

logical units, which know how to deal with their specific opcode only
the processor, which dispatches the opcodes to their logical units

Classes

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LockAcquireTimeout
Exception to report timeouts on acquiring locks.

LockAttemptTimeoutStrategy
Class with lock acquire timeout strategy.

OpExecCbBase
Base class for OpCode execution callbacks.

Processor
Object which runs OpCodes

Functions

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_CalculateLockAttemptTimeouts()
Calculate timeouts for lock attempts.

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_LUNameForOpName(opname)
Computes the LU name for a given OpCode name.

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_ComputeDispatchTable()
Computes the opcode-to-lu dispatch table.

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_SetBaseOpParams(src, defcomment, dst)
Copies basic opcode parameters.

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_ProcessResult(submit_fn, op, result)
Examines opcode result.

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_FailingSubmitManyJobs(_)
Implementation of OpExecCbBase.SubmitManyJobs to raise an exception.

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_VerifyLocks(lu, glm, _mode_whitelist=_NODE_ALLOC_MODE_WHITELIST, _nal_whitelist=_NODE_ALLOC_WHITELIST)
Performs consistency checks on locks acquired by a logical unit.

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Variables

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_OP_PREFIX = "Op"

_LU_PREFIX = "LU"

_NODE_ALLOC_WHITELIST = frozenset([])
LU classes which don't need to acquire the node allocation lock (locking.NAL) when they acquire all node or node resource locks

_NODE_ALLOC_MODE_WHITELIST = compat.UniqueFrozenset([cmdlib.LU...
LU classes which don't need to acquire the node allocation lock (locking.NAL) in the same mode (shared/exclusive) as the node or node resource locks

Imports: sys, logging, random, time, itertools, traceback, opcodes, constants, errors, hooksmaster, cmdlib, locking, utils, compat

Function Details

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_SetBaseOpParams(src, defcomment, dst)

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Copies basic opcode parameters.

Parameters:

src (opcodes.OpCode) - Source opcode
defcomment (string) - Comment to specify if not already given
dst (opcodes.OpCode) - Destination opcode

_ProcessResult(submit_fn, op, result)

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Examines opcode result.

If necessary, additional processing on the result is done.

_VerifyLocks(lu, glm, _mode_whitelist=_NODE_ALLOC_MODE_WHITELIST, _nal_whitelist=_NODE_ALLOC_WHITELIST)

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Performs consistency checks on locks acquired by a logical unit.

Parameters:

lu (cmdlib.LogicalUnit) - Logical unit instance
glm (locking.GanetiLockManager) - Lock manager

Variables Details

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_NODE_ALLOC_MODE_WHITELIST

LU classes which don't need to acquire the node allocation lock (locking.NAL) in the same mode (shared/exclusive) as the node or node resource locks

Value:

compat.UniqueFrozenset([cmdlib.LUBackupExport, cmdlib.LUBackupRemove, 
cmdlib.LUOobCommand,])