Safe Haskell	None

Ganeti.HTools.Cluster.Evacuate

Description

Implementation of node evacuation

Synopsis

data EvacSolution = EvacSolution {
- esMoved :: [(Idx, Gdx, [Ndx])]
- esFailed :: [(Idx, String)]
- esOpCodes :: [[OpCode]]
}
emptyEvacSolution :: EvacSolution
reverseEvacSolution :: EvacSolution -> EvacSolution
nodeEvacInstance :: AlgorithmOptions -> List -> List -> EvacMode -> Instance -> Gdx -> [Ndx] -> Result (List, List, [OpCode])
updateEvacSolution :: (List, List, EvacSolution) -> Idx -> Result (List, List, [OpCode]) -> (List, List, EvacSolution)
tryNodeEvac :: AlgorithmOptions -> List -> List -> List -> EvacMode -> [Idx] -> Result (List, List, EvacSolution)

Documentation

data EvacSolution Source #

Node evacuation/group change iallocator result type. This result type consists of actual opcodes (a restricted subset) that are transmitted back to Ganeti.

Constructors

EvacSolution
Fields esMoved :: [(Idx, Gdx, [Ndx])] Instances moved successfully esFailed :: [(Idx, String)] Instances which were not relocated esOpCodes :: [[OpCode]] List of jobs

Instances

Show EvacSolution #
Instance details Defined in Ganeti.HTools.Cluster.Evacuate Methods showsPrec :: Int -> EvacSolution -> ShowS show :: EvacSolution -> String showList :: [EvacSolution] -> ShowS

emptyEvacSolution :: EvacSolution Source #

The empty evac solution.

reverseEvacSolution :: EvacSolution -> EvacSolution Source #

Reverses an evacuation solution.

Rationale: we always concat the results to the top of the lists, so for proper jobset execution, we should reverse all lists.

nodeEvacInstance Source #

Arguments

:: AlgorithmOptions
-> List	The node list (cluster-wide)
-> List	Instance list (cluster-wide)
-> EvacMode	The evacuation mode
-> Instance	The instance to be evacuated
-> Gdx	The group we're targetting
-> [Ndx]	The list of available nodes for allocation
-> Result (List, List, [OpCode])

Run evacuation for a single instance.

Note: this function should correctly execute both intra-group evacuations (in all modes) and inter-group evacuations (in the ChangeAll mode). Of course, this requires that the correct list of target nodes is passed.

updateEvacSolution :: (List, List, EvacSolution) -> Idx -> Result (List, List, [OpCode]) -> (List, List, EvacSolution) Source #

Updates the evac solution with the results of an instance evacuation.

tryNodeEvac Source #

Arguments

:: AlgorithmOptions
-> List	The cluster groups
-> List	The node list (cluster-wide, not per group)
-> List	Instance list (cluster-wide)
-> EvacMode	The evacuation mode
-> [Idx]	List of instance (indices) to be evacuated
-> Result (List, List, EvacSolution)

Node-evacuation IAllocator mode main function.