root / Ganeti / HTools / Cluster.hs @ 4bc33d60
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{-| Implementation of cluster-wide logic. |
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|
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This module holds all pure cluster-logic; I\/O related functionality |
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goes into the "Main" module for the individual binaries. |
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|
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-} |
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|
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{- |
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|
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Copyright (C) 2009, 2010, 2011 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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|
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-} |
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|
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module Ganeti.HTools.Cluster |
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( |
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-- * Types |
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AllocSolution(..) |
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, Table(..) |
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, CStats(..) |
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, AllocStats |
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-- * Generic functions |
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, totalResources |
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, computeAllocationDelta |
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-- * First phase functions |
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, computeBadItems |
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-- * Second phase functions |
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, printSolutionLine |
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, formatCmds |
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, involvedNodes |
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, splitJobs |
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-- * Display functions |
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, printNodes |
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, printInsts |
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-- * Balacing functions |
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, checkMove |
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, doNextBalance |
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, tryBalance |
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, compCV |
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, compDetailedCV |
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, printStats |
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, iMoveToJob |
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-- * IAllocator functions |
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, tryAlloc |
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, tryMGAlloc |
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, tryReloc |
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, tryMGReloc |
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, tryEvac |
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, collapseFailures |
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-- * Allocation functions |
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, iterateAlloc |
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, tieredAlloc |
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, tieredSpecMap |
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-- * Node group functions |
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, instanceGroup |
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, findSplitInstances |
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, splitCluster |
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) where |
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|
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import Data.Function (on) |
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import Data.List |
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import Data.Ord (comparing) |
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import Text.Printf (printf) |
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import Control.Monad |
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import Control.Parallel.Strategies |
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|
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import qualified Ganeti.HTools.Container as Container |
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import qualified Ganeti.HTools.Instance as Instance |
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import qualified Ganeti.HTools.Node as Node |
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import qualified Ganeti.HTools.Group as Group |
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import Ganeti.HTools.Types |
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import Ganeti.HTools.Utils |
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import qualified Ganeti.OpCodes as OpCodes |
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|
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-- * Types |
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|
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-- | Allocation\/relocation solution. |
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data AllocSolution = AllocSolution |
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{ asFailures :: [FailMode] -- ^ Failure counts |
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, asAllocs :: Int -- ^ Good allocation count |
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, asSolutions :: [Node.AllocElement] -- ^ The actual result, length |
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-- of the list depends on the |
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-- allocation/relocation mode |
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, asLog :: [String] -- ^ A list of informational messages |
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} |
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|
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-- | The empty solution we start with when computing allocations |
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emptySolution :: AllocSolution |
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emptySolution = AllocSolution { asFailures = [], asAllocs = 0 |
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, asSolutions = [], asLog = [] } |
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|
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-- | The complete state for the balancing solution |
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data Table = Table Node.List Instance.List Score [Placement] |
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deriving (Show, Read) |
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|
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data CStats = CStats { csFmem :: Int -- ^ Cluster free mem |
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, csFdsk :: Int -- ^ Cluster free disk |
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, csAmem :: Int -- ^ Cluster allocatable mem |
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, csAdsk :: Int -- ^ Cluster allocatable disk |
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, csAcpu :: Int -- ^ Cluster allocatable cpus |
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, csMmem :: Int -- ^ Max node allocatable mem |
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, csMdsk :: Int -- ^ Max node allocatable disk |
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, csMcpu :: Int -- ^ Max node allocatable cpu |
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, csImem :: Int -- ^ Instance used mem |
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, csIdsk :: Int -- ^ Instance used disk |
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, csIcpu :: Int -- ^ Instance used cpu |
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, csTmem :: Double -- ^ Cluster total mem |
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, csTdsk :: Double -- ^ Cluster total disk |
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, csTcpu :: Double -- ^ Cluster total cpus |
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, csVcpu :: Int -- ^ Cluster virtual cpus (if |
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-- node pCpu has been set, |
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-- otherwise -1) |
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, csXmem :: Int -- ^ Unnacounted for mem |
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, csNmem :: Int -- ^ Node own memory |
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, csScore :: Score -- ^ The cluster score |
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, csNinst :: Int -- ^ The total number of instances |
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} |
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deriving (Show, Read) |
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|
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-- | Currently used, possibly to allocate, unallocable |
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type AllocStats = (RSpec, RSpec, RSpec) |
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|
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-- * Utility functions |
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|
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-- | Verifies the N+1 status and return the affected nodes. |
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verifyN1 :: [Node.Node] -> [Node.Node] |
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verifyN1 = filter Node.failN1 |
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|
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{-| Computes the pair of bad nodes and instances. |
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The bad node list is computed via a simple 'verifyN1' check, and the |
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bad instance list is the list of primary and secondary instances of |
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those nodes. |
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|
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-} |
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computeBadItems :: Node.List -> Instance.List -> |
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([Node.Node], [Instance.Instance]) |
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computeBadItems nl il = |
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let bad_nodes = verifyN1 $ getOnline nl |
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bad_instances = map (`Container.find` il) . |
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sort . nub $ |
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concatMap (\ n -> Node.sList n ++ Node.pList n) bad_nodes |
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in |
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(bad_nodes, bad_instances) |
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|
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-- | Zero-initializer for the CStats type |
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emptyCStats :: CStats |
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emptyCStats = CStats 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 |
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|
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-- | Update stats with data from a new node |
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updateCStats :: CStats -> Node.Node -> CStats |
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updateCStats cs node = |
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let CStats { csFmem = x_fmem, csFdsk = x_fdsk, |
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csAmem = x_amem, csAcpu = x_acpu, csAdsk = x_adsk, |
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csMmem = x_mmem, csMdsk = x_mdsk, csMcpu = x_mcpu, |
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csImem = x_imem, csIdsk = x_idsk, csIcpu = x_icpu, |
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csTmem = x_tmem, csTdsk = x_tdsk, csTcpu = x_tcpu, |
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csVcpu = x_vcpu, |
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csXmem = x_xmem, csNmem = x_nmem, csNinst = x_ninst |
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} |
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= cs |
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inc_amem = Node.fMem node - Node.rMem node |
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inc_amem' = if inc_amem > 0 then inc_amem else 0 |
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inc_adsk = Node.availDisk node |
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inc_imem = truncate (Node.tMem node) - Node.nMem node |
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- Node.xMem node - Node.fMem node |
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inc_icpu = Node.uCpu node |
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inc_idsk = truncate (Node.tDsk node) - Node.fDsk node |
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inc_vcpu = Node.hiCpu node |
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inc_acpu = Node.availCpu node |
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|
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in cs { csFmem = x_fmem + Node.fMem node |
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, csFdsk = x_fdsk + Node.fDsk node |
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, csAmem = x_amem + inc_amem' |
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, csAdsk = x_adsk + inc_adsk |
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, csAcpu = x_acpu + inc_acpu |
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, csMmem = max x_mmem inc_amem' |
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, csMdsk = max x_mdsk inc_adsk |
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, csMcpu = max x_mcpu inc_acpu |
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, csImem = x_imem + inc_imem |
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, csIdsk = x_idsk + inc_idsk |
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, csIcpu = x_icpu + inc_icpu |
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, csTmem = x_tmem + Node.tMem node |
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, csTdsk = x_tdsk + Node.tDsk node |
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, csTcpu = x_tcpu + Node.tCpu node |
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, csVcpu = x_vcpu + inc_vcpu |
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, csXmem = x_xmem + Node.xMem node |
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, csNmem = x_nmem + Node.nMem node |
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, csNinst = x_ninst + length (Node.pList node) |
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} |
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|
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-- | Compute the total free disk and memory in the cluster. |
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totalResources :: Node.List -> CStats |
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totalResources nl = |
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let cs = foldl' updateCStats emptyCStats . Container.elems $ nl |
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in cs { csScore = compCV nl } |
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|
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-- | Compute the delta between two cluster state. |
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-- |
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-- This is used when doing allocations, to understand better the |
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-- available cluster resources. The return value is a triple of the |
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-- current used values, the delta that was still allocated, and what |
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-- was left unallocated. |
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computeAllocationDelta :: CStats -> CStats -> AllocStats |
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computeAllocationDelta cini cfin = |
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let CStats {csImem = i_imem, csIdsk = i_idsk, csIcpu = i_icpu} = cini |
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CStats {csImem = f_imem, csIdsk = f_idsk, csIcpu = f_icpu, |
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csTmem = t_mem, csTdsk = t_dsk, csVcpu = v_cpu } = cfin |
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rini = RSpec i_icpu i_imem i_idsk |
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rfin = RSpec (f_icpu - i_icpu) (f_imem - i_imem) (f_idsk - i_idsk) |
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un_cpu = v_cpu - f_icpu |
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runa = RSpec un_cpu (truncate t_mem - f_imem) (truncate t_dsk - f_idsk) |
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in (rini, rfin, runa) |
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|
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-- | The names and weights of the individual elements in the CV list |
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detailedCVInfo :: [(Double, String)] |
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detailedCVInfo = [ (1, "free_mem_cv") |
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, (1, "free_disk_cv") |
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, (1, "n1_cnt") |
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, (1, "reserved_mem_cv") |
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, (4, "offline_all_cnt") |
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, (16, "offline_pri_cnt") |
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, (1, "vcpu_ratio_cv") |
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, (1, "cpu_load_cv") |
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, (1, "mem_load_cv") |
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, (1, "disk_load_cv") |
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, (1, "net_load_cv") |
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, (2, "pri_tags_score") |
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] |
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|
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detailedCVWeights :: [Double] |
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detailedCVWeights = map fst detailedCVInfo |
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|
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-- | Compute the mem and disk covariance. |
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compDetailedCV :: Node.List -> [Double] |
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compDetailedCV nl = |
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let |
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all_nodes = Container.elems nl |
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(offline, nodes) = partition Node.offline all_nodes |
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mem_l = map Node.pMem nodes |
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dsk_l = map Node.pDsk nodes |
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-- metric: memory covariance |
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mem_cv = stdDev mem_l |
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-- metric: disk covariance |
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dsk_cv = stdDev dsk_l |
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-- metric: count of instances living on N1 failing nodes |
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n1_score = fromIntegral . sum . map (\n -> length (Node.sList n) + |
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length (Node.pList n)) . |
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filter Node.failN1 $ nodes :: Double |
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res_l = map Node.pRem nodes |
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-- metric: reserved memory covariance |
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res_cv = stdDev res_l |
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-- offline instances metrics |
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offline_ipri = sum . map (length . Node.pList) $ offline |
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offline_isec = sum . map (length . Node.sList) $ offline |
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-- metric: count of instances on offline nodes |
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off_score = fromIntegral (offline_ipri + offline_isec)::Double |
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-- metric: count of primary instances on offline nodes (this |
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-- helps with evacuation/failover of primary instances on |
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-- 2-node clusters with one node offline) |
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off_pri_score = fromIntegral offline_ipri::Double |
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cpu_l = map Node.pCpu nodes |
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-- metric: covariance of vcpu/pcpu ratio |
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cpu_cv = stdDev cpu_l |
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-- metrics: covariance of cpu, memory, disk and network load |
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(c_load, m_load, d_load, n_load) = unzip4 $ |
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map (\n -> |
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let DynUtil c1 m1 d1 n1 = Node.utilLoad n |
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DynUtil c2 m2 d2 n2 = Node.utilPool n |
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in (c1/c2, m1/m2, d1/d2, n1/n2) |
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) nodes |
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-- metric: conflicting instance count |
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pri_tags_inst = sum $ map Node.conflictingPrimaries nodes |
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pri_tags_score = fromIntegral pri_tags_inst::Double |
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in [ mem_cv, dsk_cv, n1_score, res_cv, off_score, off_pri_score, cpu_cv |
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, stdDev c_load, stdDev m_load , stdDev d_load, stdDev n_load |
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, pri_tags_score ] |
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|
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-- | Compute the /total/ variance. |
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compCV :: Node.List -> Double |
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compCV = sum . zipWith (*) detailedCVWeights . compDetailedCV |
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|
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-- | Compute online nodes from a Node.List |
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getOnline :: Node.List -> [Node.Node] |
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getOnline = filter (not . Node.offline) . Container.elems |
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|
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-- * hbal functions |
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|
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-- | Compute best table. Note that the ordering of the arguments is important. |
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compareTables :: Table -> Table -> Table |
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compareTables a@(Table _ _ a_cv _) b@(Table _ _ b_cv _ ) = |
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if a_cv > b_cv then b else a |
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|
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-- | Applies an instance move to a given node list and instance. |
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applyMove :: Node.List -> Instance.Instance |
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-> IMove -> OpResult (Node.List, Instance.Instance, Ndx, Ndx) |
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-- Failover (f) |
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applyMove nl inst Failover = |
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let old_pdx = Instance.pNode inst |
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old_sdx = Instance.sNode inst |
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old_p = Container.find old_pdx nl |
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old_s = Container.find old_sdx nl |
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int_p = Node.removePri old_p inst |
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int_s = Node.removeSec old_s inst |
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force_p = Node.offline old_p |
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new_nl = do -- Maybe monad |
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new_p <- Node.addPriEx force_p int_s inst |
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new_s <- Node.addSec int_p inst old_sdx |
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let new_inst = Instance.setBoth inst old_sdx old_pdx |
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return (Container.addTwo old_pdx new_s old_sdx new_p nl, |
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new_inst, old_sdx, old_pdx) |
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in new_nl |
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|
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-- Replace the primary (f:, r:np, f) |
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applyMove nl inst (ReplacePrimary new_pdx) = |
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let old_pdx = Instance.pNode inst |
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old_sdx = Instance.sNode inst |
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old_p = Container.find old_pdx nl |
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old_s = Container.find old_sdx nl |
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tgt_n = Container.find new_pdx nl |
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int_p = Node.removePri old_p inst |
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int_s = Node.removeSec old_s inst |
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force_p = Node.offline old_p |
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new_nl = do -- Maybe monad |
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-- check that the current secondary can host the instance |
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-- during the migration |
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tmp_s <- Node.addPriEx force_p int_s inst |
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let tmp_s' = Node.removePri tmp_s inst |
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new_p <- Node.addPriEx force_p tgt_n inst |
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new_s <- Node.addSecEx force_p tmp_s' inst new_pdx |
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let new_inst = Instance.setPri inst new_pdx |
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return (Container.add new_pdx new_p $ |
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Container.addTwo old_pdx int_p old_sdx new_s nl, |
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new_inst, new_pdx, old_sdx) |
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in new_nl |
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|
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-- Replace the secondary (r:ns) |
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applyMove nl inst (ReplaceSecondary new_sdx) = |
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let old_pdx = Instance.pNode inst |
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old_sdx = Instance.sNode inst |
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old_s = Container.find old_sdx nl |
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tgt_n = Container.find new_sdx nl |
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int_s = Node.removeSec old_s inst |
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force_s = Node.offline old_s |
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new_inst = Instance.setSec inst new_sdx |
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new_nl = Node.addSecEx force_s tgt_n inst old_pdx >>= |
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\new_s -> return (Container.addTwo new_sdx |
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new_s old_sdx int_s nl, |
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new_inst, old_pdx, new_sdx) |
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in new_nl |
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|
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-- Replace the secondary and failover (r:np, f) |
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applyMove nl inst (ReplaceAndFailover new_pdx) = |
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let old_pdx = Instance.pNode inst |
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old_sdx = Instance.sNode inst |
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old_p = Container.find old_pdx nl |
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old_s = Container.find old_sdx nl |
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tgt_n = Container.find new_pdx nl |
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int_p = Node.removePri old_p inst |
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int_s = Node.removeSec old_s inst |
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force_s = Node.offline old_s |
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new_nl = do -- Maybe monad |
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new_p <- Node.addPri tgt_n inst |
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new_s <- Node.addSecEx force_s int_p inst new_pdx |
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let new_inst = Instance.setBoth inst new_pdx old_pdx |
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return (Container.add new_pdx new_p $ |
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Container.addTwo old_pdx new_s old_sdx int_s nl, |
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new_inst, new_pdx, old_pdx) |
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in new_nl |
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|
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-- Failver and replace the secondary (f, r:ns) |
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applyMove nl inst (FailoverAndReplace new_sdx) = |
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let old_pdx = Instance.pNode inst |
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old_sdx = Instance.sNode inst |
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old_p = Container.find old_pdx nl |
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old_s = Container.find old_sdx nl |
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tgt_n = Container.find new_sdx nl |
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int_p = Node.removePri old_p inst |
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int_s = Node.removeSec old_s inst |
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force_p = Node.offline old_p |
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new_nl = do -- Maybe monad |
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new_p <- Node.addPriEx force_p int_s inst |
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new_s <- Node.addSecEx force_p tgt_n inst old_sdx |
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let new_inst = Instance.setBoth inst old_sdx new_sdx |
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return (Container.add new_sdx new_s $ |
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Container.addTwo old_sdx new_p old_pdx int_p nl, |
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new_inst, old_sdx, new_sdx) |
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in new_nl |
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|
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-- | Tries to allocate an instance on one given node. |
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allocateOnSingle :: Node.List -> Instance.Instance -> Node.Node |
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-> OpResult Node.AllocElement |
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allocateOnSingle nl inst p = |
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let new_pdx = Node.idx p |
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new_inst = Instance.setBoth inst new_pdx Node.noSecondary |
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in Node.addPri p inst >>= \new_p -> do |
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let new_nl = Container.add new_pdx new_p nl |
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new_score = compCV nl |
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return (new_nl, new_inst, [new_p], new_score) |
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|
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-- | Tries to allocate an instance on a given pair of nodes. |
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allocateOnPair :: Node.List -> Instance.Instance -> Node.Node -> Node.Node |
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-> OpResult Node.AllocElement |
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allocateOnPair nl inst tgt_p tgt_s = |
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let new_pdx = Node.idx tgt_p |
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new_sdx = Node.idx tgt_s |
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in do |
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new_p <- Node.addPri tgt_p inst |
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new_s <- Node.addSec tgt_s inst new_pdx |
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let new_inst = Instance.setBoth inst new_pdx new_sdx |
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new_nl = Container.addTwo new_pdx new_p new_sdx new_s nl |
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return (new_nl, new_inst, [new_p, new_s], compCV new_nl) |
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|
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-- | Tries to perform an instance move and returns the best table |
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-- between the original one and the new one. |
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checkSingleStep :: Table -- ^ The original table |
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-> Instance.Instance -- ^ The instance to move |
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-> Table -- ^ The current best table |
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-> IMove -- ^ The move to apply |
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-> Table -- ^ The final best table |
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checkSingleStep ini_tbl target cur_tbl move = |
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let |
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Table ini_nl ini_il _ ini_plc = ini_tbl |
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tmp_resu = applyMove ini_nl target move |
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in |
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case tmp_resu of |
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OpFail _ -> cur_tbl |
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OpGood (upd_nl, new_inst, pri_idx, sec_idx) -> |
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let tgt_idx = Instance.idx target |
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upd_cvar = compCV upd_nl |
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upd_il = Container.add tgt_idx new_inst ini_il |
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upd_plc = (tgt_idx, pri_idx, sec_idx, move, upd_cvar):ini_plc |
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upd_tbl = Table upd_nl upd_il upd_cvar upd_plc |
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in |
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compareTables cur_tbl upd_tbl |
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|
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-- | Given the status of the current secondary as a valid new node and |
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-- the current candidate target node, generate the possible moves for |
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-- a instance. |
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possibleMoves :: Bool -- ^ Whether the secondary node is a valid new node |
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-> Ndx -- ^ Target node candidate |
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-> [IMove] -- ^ List of valid result moves |
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possibleMoves True tdx = |
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[ReplaceSecondary tdx, |
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ReplaceAndFailover tdx, |
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ReplacePrimary tdx, |
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FailoverAndReplace tdx] |
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|
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possibleMoves False tdx = |
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[ReplaceSecondary tdx, |
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ReplaceAndFailover tdx] |
466 |
|
467 |
-- | Compute the best move for a given instance. |
468 |
checkInstanceMove :: [Ndx] -- ^ Allowed target node indices |
469 |
-> Bool -- ^ Whether disk moves are allowed |
470 |
-> Table -- ^ Original table |
471 |
-> Instance.Instance -- ^ Instance to move |
472 |
-> Table -- ^ Best new table for this instance |
473 |
checkInstanceMove nodes_idx disk_moves ini_tbl target = |
474 |
let |
475 |
opdx = Instance.pNode target |
476 |
osdx = Instance.sNode target |
477 |
nodes = filter (\idx -> idx /= opdx && idx /= osdx) nodes_idx |
478 |
use_secondary = elem osdx nodes_idx |
479 |
aft_failover = if use_secondary -- if allowed to failover |
480 |
then checkSingleStep ini_tbl target ini_tbl Failover |
481 |
else ini_tbl |
482 |
all_moves = if disk_moves |
483 |
then concatMap (possibleMoves use_secondary) nodes |
484 |
else [] |
485 |
in |
486 |
-- iterate over the possible nodes for this instance |
487 |
foldl' (checkSingleStep ini_tbl target) aft_failover all_moves |
488 |
|
489 |
-- | Compute the best next move. |
490 |
checkMove :: [Ndx] -- ^ Allowed target node indices |
491 |
-> Bool -- ^ Whether disk moves are allowed |
492 |
-> Table -- ^ The current solution |
493 |
-> [Instance.Instance] -- ^ List of instances still to move |
494 |
-> Table -- ^ The new solution |
495 |
checkMove nodes_idx disk_moves ini_tbl victims = |
496 |
let Table _ _ _ ini_plc = ini_tbl |
497 |
-- we're using rwhnf from the Control.Parallel.Strategies |
498 |
-- package; we don't need to use rnf as that would force too |
499 |
-- much evaluation in single-threaded cases, and in |
500 |
-- multi-threaded case the weak head normal form is enough to |
501 |
-- spark the evaluation |
502 |
tables = parMap rwhnf (checkInstanceMove nodes_idx disk_moves ini_tbl) |
503 |
victims |
504 |
-- iterate over all instances, computing the best move |
505 |
best_tbl = |
506 |
foldl' |
507 |
(\ step_tbl new_tbl -> compareTables step_tbl new_tbl) |
508 |
ini_tbl tables |
509 |
Table _ _ _ best_plc = best_tbl |
510 |
in if length best_plc == length ini_plc |
511 |
then ini_tbl -- no advancement |
512 |
else best_tbl |
513 |
|
514 |
-- | Check if we are allowed to go deeper in the balancing |
515 |
doNextBalance :: Table -- ^ The starting table |
516 |
-> Int -- ^ Remaining length |
517 |
-> Score -- ^ Score at which to stop |
518 |
-> Bool -- ^ The resulting table and commands |
519 |
doNextBalance ini_tbl max_rounds min_score = |
520 |
let Table _ _ ini_cv ini_plc = ini_tbl |
521 |
ini_plc_len = length ini_plc |
522 |
in (max_rounds < 0 || ini_plc_len < max_rounds) && ini_cv > min_score |
523 |
|
524 |
-- | Run a balance move |
525 |
tryBalance :: Table -- ^ The starting table |
526 |
-> Bool -- ^ Allow disk moves |
527 |
-> Bool -- ^ Only evacuate moves |
528 |
-> Score -- ^ Min gain threshold |
529 |
-> Score -- ^ Min gain |
530 |
-> Maybe Table -- ^ The resulting table and commands |
531 |
tryBalance ini_tbl disk_moves evac_mode mg_limit min_gain = |
532 |
let Table ini_nl ini_il ini_cv _ = ini_tbl |
533 |
all_inst = Container.elems ini_il |
534 |
all_inst' = if evac_mode |
535 |
then let bad_nodes = map Node.idx . filter Node.offline $ |
536 |
Container.elems ini_nl |
537 |
in filter (\e -> Instance.sNode e `elem` bad_nodes || |
538 |
Instance.pNode e `elem` bad_nodes) |
539 |
all_inst |
540 |
else all_inst |
541 |
reloc_inst = filter Instance.movable all_inst' |
542 |
node_idx = map Node.idx . filter (not . Node.offline) $ |
543 |
Container.elems ini_nl |
544 |
fin_tbl = checkMove node_idx disk_moves ini_tbl reloc_inst |
545 |
(Table _ _ fin_cv _) = fin_tbl |
546 |
in |
547 |
if fin_cv < ini_cv && (ini_cv > mg_limit || ini_cv - fin_cv >= min_gain) |
548 |
then Just fin_tbl -- this round made success, return the new table |
549 |
else Nothing |
550 |
|
551 |
-- * Allocation functions |
552 |
|
553 |
-- | Build failure stats out of a list of failures |
554 |
collapseFailures :: [FailMode] -> FailStats |
555 |
collapseFailures flst = |
556 |
map (\k -> (k, length $ filter (k ==) flst)) [minBound..maxBound] |
557 |
|
558 |
-- | Update current Allocation solution and failure stats with new |
559 |
-- elements |
560 |
concatAllocs :: AllocSolution -> OpResult Node.AllocElement -> AllocSolution |
561 |
concatAllocs as (OpFail reason) = as { asFailures = reason : asFailures as } |
562 |
|
563 |
concatAllocs as (OpGood ns@(_, _, _, nscore)) = |
564 |
let -- Choose the old or new solution, based on the cluster score |
565 |
cntok = asAllocs as |
566 |
osols = asSolutions as |
567 |
nsols = case osols of |
568 |
[] -> [ns] |
569 |
(_, _, _, oscore):[] -> |
570 |
if oscore < nscore |
571 |
then osols |
572 |
else [ns] |
573 |
-- FIXME: here we simply concat to lists with more |
574 |
-- than one element; we should instead abort, since |
575 |
-- this is not a valid usage of this function |
576 |
xs -> ns:xs |
577 |
nsuc = cntok + 1 |
578 |
-- Note: we force evaluation of nsols here in order to keep the |
579 |
-- memory profile low - we know that we will need nsols for sure |
580 |
-- in the next cycle, so we force evaluation of nsols, since the |
581 |
-- foldl' in the caller will only evaluate the tuple, but not the |
582 |
-- elements of the tuple |
583 |
in nsols `seq` nsuc `seq` as { asAllocs = nsuc, asSolutions = nsols } |
584 |
|
585 |
-- | Given a solution, generates a reasonable description for it |
586 |
describeSolution :: AllocSolution -> String |
587 |
describeSolution as = |
588 |
let fcnt = asFailures as |
589 |
sols = asSolutions as |
590 |
freasons = |
591 |
intercalate ", " . map (\(a, b) -> printf "%s: %d" (show a) b) . |
592 |
filter ((> 0) . snd) . collapseFailures $ fcnt |
593 |
in if null sols |
594 |
then "No valid allocation solutions, failure reasons: " ++ |
595 |
(if null fcnt |
596 |
then "unknown reasons" |
597 |
else freasons) |
598 |
else let (_, _, nodes, cv) = head sols |
599 |
in printf ("score: %.8f, successes %d, failures %d (%s)" ++ |
600 |
" for node(s) %s") cv (asAllocs as) (length fcnt) freasons |
601 |
(intercalate "/" . map Node.name $ nodes) |
602 |
|
603 |
-- | Annotates a solution with the appropriate string |
604 |
annotateSolution :: AllocSolution -> AllocSolution |
605 |
annotateSolution as = as { asLog = describeSolution as : asLog as } |
606 |
|
607 |
-- | Try to allocate an instance on the cluster. |
608 |
tryAlloc :: (Monad m) => |
609 |
Node.List -- ^ The node list |
610 |
-> Instance.List -- ^ The instance list |
611 |
-> Instance.Instance -- ^ The instance to allocate |
612 |
-> Int -- ^ Required number of nodes |
613 |
-> m AllocSolution -- ^ Possible solution list |
614 |
tryAlloc nl _ inst 2 = |
615 |
let all_nodes = getOnline nl |
616 |
all_pairs = liftM2 (,) all_nodes all_nodes |
617 |
ok_pairs = filter (\(x, y) -> Node.idx x /= Node.idx y) all_pairs |
618 |
sols = foldl' (\cstate (p, s) -> |
619 |
concatAllocs cstate $ allocateOnPair nl inst p s |
620 |
) emptySolution ok_pairs |
621 |
|
622 |
in if null ok_pairs -- means we have just one node |
623 |
then fail "Not enough online nodes" |
624 |
else return $ annotateSolution sols |
625 |
|
626 |
tryAlloc nl _ inst 1 = |
627 |
let all_nodes = getOnline nl |
628 |
sols = foldl' (\cstate -> |
629 |
concatAllocs cstate . allocateOnSingle nl inst |
630 |
) emptySolution all_nodes |
631 |
in if null all_nodes |
632 |
then fail "No online nodes" |
633 |
else return $ annotateSolution sols |
634 |
|
635 |
tryAlloc _ _ _ reqn = fail $ "Unsupported number of allocation \ |
636 |
\destinations required (" ++ show reqn ++ |
637 |
"), only two supported" |
638 |
|
639 |
-- | Given a group/result, describe it as a nice (list of) messages |
640 |
solutionDescription :: Group.List -> (Gdx, Result AllocSolution) -> [String] |
641 |
solutionDescription gl (groupId, result) = |
642 |
case result of |
643 |
Ok solution -> map (printf "Group %s (%s): %s" gname pol) (asLog solution) |
644 |
Bad message -> [printf "Group %s: error %s" gname message] |
645 |
where grp = Container.find groupId gl |
646 |
gname = Group.name grp |
647 |
pol = apolToString (Group.allocPolicy grp) |
648 |
|
649 |
-- | From a list of possibly bad and possibly empty solutions, filter |
650 |
-- only the groups with a valid result |
651 |
filterMGResults :: Group.List |
652 |
-> [(Gdx, Result AllocSolution)] |
653 |
-> [(Gdx, AllocSolution)] |
654 |
filterMGResults gl= |
655 |
filter ((/= AllocUnallocable) . Group.allocPolicy . |
656 |
flip Container.find gl . fst) . |
657 |
filter (not . null . asSolutions . snd) . |
658 |
map (\(y, Ok x) -> (y, x)) . |
659 |
filter (isOk . snd) |
660 |
|
661 |
-- | Sort multigroup results based on policy and score |
662 |
sortMGResults :: Group.List |
663 |
-> [(Gdx, AllocSolution)] |
664 |
-> [(Gdx, AllocSolution)] |
665 |
sortMGResults gl sols = |
666 |
let extractScore = \(_, _, _, x) -> x |
667 |
solScore (gdx, sol) = (Group.allocPolicy (Container.find gdx gl), |
668 |
(extractScore . head . asSolutions) sol) |
669 |
in sortBy (comparing solScore) sols |
670 |
|
671 |
-- | Try to allocate an instance on a multi-group cluster. |
672 |
tryMGAlloc :: Group.List -- ^ The group list |
673 |
-> Node.List -- ^ The node list |
674 |
-> Instance.List -- ^ The instance list |
675 |
-> Instance.Instance -- ^ The instance to allocate |
676 |
-> Int -- ^ Required number of nodes |
677 |
-> Result AllocSolution -- ^ Possible solution list |
678 |
tryMGAlloc mggl mgnl mgil inst cnt = |
679 |
let groups = splitCluster mgnl mgil |
680 |
-- TODO: currently we consider all groups preferred |
681 |
sols = map (\(gid, (nl, il)) -> |
682 |
(gid, tryAlloc nl il inst cnt)) groups:: |
683 |
[(Gdx, Result AllocSolution)] |
684 |
all_msgs = concatMap (solutionDescription mggl) sols |
685 |
goodSols = filterMGResults mggl sols |
686 |
sortedSols = sortMGResults mggl goodSols |
687 |
in if null sortedSols |
688 |
then Bad $ intercalate ", " all_msgs |
689 |
else let (final_group, final_sol) = head sortedSols |
690 |
final_name = Group.name $ Container.find final_group mggl |
691 |
selmsg = "Selected group: " ++ final_name |
692 |
in Ok $ final_sol { asLog = selmsg:all_msgs } |
693 |
|
694 |
-- | Try to relocate an instance on the cluster. |
695 |
tryReloc :: (Monad m) => |
696 |
Node.List -- ^ The node list |
697 |
-> Instance.List -- ^ The instance list |
698 |
-> Idx -- ^ The index of the instance to move |
699 |
-> Int -- ^ The number of nodes required |
700 |
-> [Ndx] -- ^ Nodes which should not be used |
701 |
-> m AllocSolution -- ^ Solution list |
702 |
tryReloc nl il xid 1 ex_idx = |
703 |
let all_nodes = getOnline nl |
704 |
inst = Container.find xid il |
705 |
ex_idx' = Instance.pNode inst:ex_idx |
706 |
valid_nodes = filter (not . flip elem ex_idx' . Node.idx) all_nodes |
707 |
valid_idxes = map Node.idx valid_nodes |
708 |
sols1 = foldl' (\cstate x -> |
709 |
let em = do |
710 |
(mnl, i, _, _) <- |
711 |
applyMove nl inst (ReplaceSecondary x) |
712 |
return (mnl, i, [Container.find x mnl], |
713 |
compCV mnl) |
714 |
in concatAllocs cstate em |
715 |
) emptySolution valid_idxes |
716 |
in return sols1 |
717 |
|
718 |
tryReloc _ _ _ reqn _ = fail $ "Unsupported number of relocation \ |
719 |
\destinations required (" ++ show reqn ++ |
720 |
"), only one supported" |
721 |
|
722 |
tryMGReloc :: (Monad m) => |
723 |
Group.List -- ^ The group list |
724 |
-> Node.List -- ^ The node list |
725 |
-> Instance.List -- ^ The instance list |
726 |
-> Idx -- ^ The index of the instance to move |
727 |
-> Int -- ^ The number of nodes required |
728 |
-> [Ndx] -- ^ Nodes which should not be used |
729 |
-> m AllocSolution -- ^ Solution list |
730 |
tryMGReloc _ mgnl mgil xid ncount ex_ndx = do |
731 |
let groups = splitCluster mgnl mgil |
732 |
-- TODO: we only relocate inside the group for now |
733 |
inst = Container.find xid mgil |
734 |
(nl, il) <- case lookup (instancePriGroup mgnl inst) groups of |
735 |
Nothing -> fail $ "Cannot find group for instance " ++ |
736 |
Instance.name inst |
737 |
Just v -> return v |
738 |
tryReloc nl il xid ncount ex_ndx |
739 |
|
740 |
-- | Try to evacuate a list of nodes. |
741 |
tryEvac :: (Monad m) => |
742 |
Node.List -- ^ The node list |
743 |
-> Instance.List -- ^ The instance list |
744 |
-> [Ndx] -- ^ Nodes to be evacuated |
745 |
-> m AllocSolution -- ^ Solution list |
746 |
tryEvac nl il ex_ndx = |
747 |
let ex_nodes = map (`Container.find` nl) ex_ndx |
748 |
all_insts = nub . concatMap Node.sList $ ex_nodes |
749 |
in do |
750 |
(_, sol) <- foldM (\(nl', old_as) idx -> do |
751 |
-- FIXME: hardcoded one node here |
752 |
-- (fm, cs, aes) |
753 |
new_as <- tryReloc nl' il idx 1 ex_ndx |
754 |
case asSolutions new_as of |
755 |
csol@(nl'', _, _, _):_ -> |
756 |
-- an individual relocation succeeded, |
757 |
-- we kind of compose the data from |
758 |
-- the two solutions |
759 |
return (nl'', |
760 |
new_as { asSolutions = |
761 |
csol:asSolutions old_as }) |
762 |
-- this relocation failed, so we fail |
763 |
-- the entire evac |
764 |
_ -> fail $ "Can't evacuate instance " ++ |
765 |
Instance.name (Container.find idx il) ++ |
766 |
": " ++ describeSolution new_as |
767 |
) (nl, emptySolution) all_insts |
768 |
return $ annotateSolution sol |
769 |
|
770 |
-- | Recursively place instances on the cluster until we're out of space |
771 |
iterateAlloc :: Node.List |
772 |
-> Instance.List |
773 |
-> Instance.Instance |
774 |
-> Int |
775 |
-> [Instance.Instance] |
776 |
-> [CStats] |
777 |
-> Result (FailStats, Node.List, Instance.List, |
778 |
[Instance.Instance], [CStats]) |
779 |
iterateAlloc nl il newinst nreq ixes cstats = |
780 |
let depth = length ixes |
781 |
newname = printf "new-%d" depth::String |
782 |
newidx = length (Container.elems il) + depth |
783 |
newi2 = Instance.setIdx (Instance.setName newinst newname) newidx |
784 |
in case tryAlloc nl il newi2 nreq of |
785 |
Bad s -> Bad s |
786 |
Ok (AllocSolution { asFailures = errs, asSolutions = sols3 }) -> |
787 |
case sols3 of |
788 |
[] -> Ok (collapseFailures errs, nl, il, ixes, cstats) |
789 |
(xnl, xi, _, _):[] -> |
790 |
iterateAlloc xnl (Container.add newidx xi il) |
791 |
newinst nreq (xi:ixes) |
792 |
(totalResources xnl:cstats) |
793 |
_ -> Bad "Internal error: multiple solutions for single\ |
794 |
\ allocation" |
795 |
|
796 |
-- | The core of the tiered allocation mode |
797 |
tieredAlloc :: Node.List |
798 |
-> Instance.List |
799 |
-> Instance.Instance |
800 |
-> Int |
801 |
-> [Instance.Instance] |
802 |
-> [CStats] |
803 |
-> Result (FailStats, Node.List, Instance.List, |
804 |
[Instance.Instance], [CStats]) |
805 |
tieredAlloc nl il newinst nreq ixes cstats = |
806 |
case iterateAlloc nl il newinst nreq ixes cstats of |
807 |
Bad s -> Bad s |
808 |
Ok (errs, nl', il', ixes', cstats') -> |
809 |
case Instance.shrinkByType newinst . fst . last $ |
810 |
sortBy (comparing snd) errs of |
811 |
Bad _ -> Ok (errs, nl', il', ixes', cstats') |
812 |
Ok newinst' -> |
813 |
tieredAlloc nl' il' newinst' nreq ixes' cstats' |
814 |
|
815 |
-- | Compute the tiered spec string description from a list of |
816 |
-- allocated instances. |
817 |
tieredSpecMap :: [Instance.Instance] |
818 |
-> [String] |
819 |
tieredSpecMap trl_ixes = |
820 |
let fin_trl_ixes = reverse trl_ixes |
821 |
ix_byspec = groupBy ((==) `on` Instance.specOf) fin_trl_ixes |
822 |
spec_map = map (\ixs -> (Instance.specOf $ head ixs, length ixs)) |
823 |
ix_byspec |
824 |
in map (\(spec, cnt) -> printf "%d,%d,%d=%d" (rspecMem spec) |
825 |
(rspecDsk spec) (rspecCpu spec) cnt) spec_map |
826 |
|
827 |
-- * Formatting functions |
828 |
|
829 |
-- | Given the original and final nodes, computes the relocation description. |
830 |
computeMoves :: Instance.Instance -- ^ The instance to be moved |
831 |
-> String -- ^ The instance name |
832 |
-> IMove -- ^ The move being performed |
833 |
-> String -- ^ New primary |
834 |
-> String -- ^ New secondary |
835 |
-> (String, [String]) |
836 |
-- ^ Tuple of moves and commands list; moves is containing |
837 |
-- either @/f/@ for failover or @/r:name/@ for replace |
838 |
-- secondary, while the command list holds gnt-instance |
839 |
-- commands (without that prefix), e.g \"@failover instance1@\" |
840 |
computeMoves i inam mv c d = |
841 |
case mv of |
842 |
Failover -> ("f", [mig]) |
843 |
FailoverAndReplace _ -> (printf "f r:%s" d, [mig, rep d]) |
844 |
ReplaceSecondary _ -> (printf "r:%s" d, [rep d]) |
845 |
ReplaceAndFailover _ -> (printf "r:%s f" c, [rep c, mig]) |
846 |
ReplacePrimary _ -> (printf "f r:%s f" c, [mig, rep c, mig]) |
847 |
where morf = if Instance.running i then "migrate" else "failover" |
848 |
mig = printf "%s -f %s" morf inam::String |
849 |
rep n = printf "replace-disks -n %s %s" n inam |
850 |
|
851 |
-- | Converts a placement to string format. |
852 |
printSolutionLine :: Node.List -- ^ The node list |
853 |
-> Instance.List -- ^ The instance list |
854 |
-> Int -- ^ Maximum node name length |
855 |
-> Int -- ^ Maximum instance name length |
856 |
-> Placement -- ^ The current placement |
857 |
-> Int -- ^ The index of the placement in |
858 |
-- the solution |
859 |
-> (String, [String]) |
860 |
printSolutionLine nl il nmlen imlen plc pos = |
861 |
let |
862 |
pmlen = (2*nmlen + 1) |
863 |
(i, p, s, mv, c) = plc |
864 |
inst = Container.find i il |
865 |
inam = Instance.alias inst |
866 |
npri = Node.alias $ Container.find p nl |
867 |
nsec = Node.alias $ Container.find s nl |
868 |
opri = Node.alias $ Container.find (Instance.pNode inst) nl |
869 |
osec = Node.alias $ Container.find (Instance.sNode inst) nl |
870 |
(moves, cmds) = computeMoves inst inam mv npri nsec |
871 |
ostr = printf "%s:%s" opri osec::String |
872 |
nstr = printf "%s:%s" npri nsec::String |
873 |
in |
874 |
(printf " %3d. %-*s %-*s => %-*s %.8f a=%s" |
875 |
pos imlen inam pmlen ostr |
876 |
pmlen nstr c moves, |
877 |
cmds) |
878 |
|
879 |
-- | Return the instance and involved nodes in an instance move. |
880 |
involvedNodes :: Instance.List -> Placement -> [Ndx] |
881 |
involvedNodes il plc = |
882 |
let (i, np, ns, _, _) = plc |
883 |
inst = Container.find i il |
884 |
op = Instance.pNode inst |
885 |
os = Instance.sNode inst |
886 |
in nub [np, ns, op, os] |
887 |
|
888 |
-- | Inner function for splitJobs, that either appends the next job to |
889 |
-- the current jobset, or starts a new jobset. |
890 |
mergeJobs :: ([JobSet], [Ndx]) -> MoveJob -> ([JobSet], [Ndx]) |
891 |
mergeJobs ([], _) n@(ndx, _, _, _) = ([[n]], ndx) |
892 |
mergeJobs (cjs@(j:js), nbuf) n@(ndx, _, _, _) |
893 |
| null (ndx `intersect` nbuf) = ((n:j):js, ndx ++ nbuf) |
894 |
| otherwise = ([n]:cjs, ndx) |
895 |
|
896 |
-- | Break a list of moves into independent groups. Note that this |
897 |
-- will reverse the order of jobs. |
898 |
splitJobs :: [MoveJob] -> [JobSet] |
899 |
splitJobs = fst . foldl mergeJobs ([], []) |
900 |
|
901 |
-- | Given a list of commands, prefix them with @gnt-instance@ and |
902 |
-- also beautify the display a little. |
903 |
formatJob :: Int -> Int -> (Int, MoveJob) -> [String] |
904 |
formatJob jsn jsl (sn, (_, _, _, cmds)) = |
905 |
let out = |
906 |
printf " echo job %d/%d" jsn sn: |
907 |
printf " check": |
908 |
map (" gnt-instance " ++) cmds |
909 |
in if sn == 1 |
910 |
then ["", printf "echo jobset %d, %d jobs" jsn jsl] ++ out |
911 |
else out |
912 |
|
913 |
-- | Given a list of commands, prefix them with @gnt-instance@ and |
914 |
-- also beautify the display a little. |
915 |
formatCmds :: [JobSet] -> String |
916 |
formatCmds = |
917 |
unlines . |
918 |
concatMap (\(jsn, js) -> concatMap (formatJob jsn (length js)) |
919 |
(zip [1..] js)) . |
920 |
zip [1..] |
921 |
|
922 |
-- | Print the node list. |
923 |
printNodes :: Node.List -> [String] -> String |
924 |
printNodes nl fs = |
925 |
let fields = case fs of |
926 |
[] -> Node.defaultFields |
927 |
"+":rest -> Node.defaultFields ++ rest |
928 |
_ -> fs |
929 |
snl = sortBy (comparing Node.idx) (Container.elems nl) |
930 |
(header, isnum) = unzip $ map Node.showHeader fields |
931 |
in unlines . map ((:) ' ' . intercalate " ") $ |
932 |
formatTable (header:map (Node.list fields) snl) isnum |
933 |
|
934 |
-- | Print the instance list. |
935 |
printInsts :: Node.List -> Instance.List -> String |
936 |
printInsts nl il = |
937 |
let sil = sortBy (comparing Instance.idx) (Container.elems il) |
938 |
helper inst = [ if Instance.running inst then "R" else " " |
939 |
, Instance.name inst |
940 |
, Container.nameOf nl (Instance.pNode inst) |
941 |
, let sdx = Instance.sNode inst |
942 |
in if sdx == Node.noSecondary |
943 |
then "" |
944 |
else Container.nameOf nl sdx |
945 |
, printf "%3d" $ Instance.vcpus inst |
946 |
, printf "%5d" $ Instance.mem inst |
947 |
, printf "%5d" $ Instance.dsk inst `div` 1024 |
948 |
, printf "%5.3f" lC |
949 |
, printf "%5.3f" lM |
950 |
, printf "%5.3f" lD |
951 |
, printf "%5.3f" lN |
952 |
] |
953 |
where DynUtil lC lM lD lN = Instance.util inst |
954 |
header = [ "F", "Name", "Pri_node", "Sec_node", "vcpu", "mem" |
955 |
, "dsk", "lCpu", "lMem", "lDsk", "lNet" ] |
956 |
isnum = False:False:False:False:repeat True |
957 |
in unlines . map ((:) ' ' . intercalate " ") $ |
958 |
formatTable (header:map helper sil) isnum |
959 |
|
960 |
-- | Shows statistics for a given node list. |
961 |
printStats :: Node.List -> String |
962 |
printStats nl = |
963 |
let dcvs = compDetailedCV nl |
964 |
(weights, names) = unzip detailedCVInfo |
965 |
hd = zip3 (weights ++ repeat 1) (names ++ repeat "unknown") dcvs |
966 |
formatted = map (\(w, header, val) -> |
967 |
printf "%s=%.8f(x%.2f)" header val w::String) hd |
968 |
in intercalate ", " formatted |
969 |
|
970 |
-- | Convert a placement into a list of OpCodes (basically a job). |
971 |
iMoveToJob :: Node.List -> Instance.List |
972 |
-> Idx -> IMove -> [OpCodes.OpCode] |
973 |
iMoveToJob nl il idx move = |
974 |
let inst = Container.find idx il |
975 |
iname = Instance.name inst |
976 |
lookNode = Just . Container.nameOf nl |
977 |
opF = if Instance.running inst |
978 |
then OpCodes.OpMigrateInstance iname True False |
979 |
else OpCodes.OpFailoverInstance iname False |
980 |
opR n = OpCodes.OpReplaceDisks iname (lookNode n) |
981 |
OpCodes.ReplaceNewSecondary [] Nothing |
982 |
in case move of |
983 |
Failover -> [ opF ] |
984 |
ReplacePrimary np -> [ opF, opR np, opF ] |
985 |
ReplaceSecondary ns -> [ opR ns ] |
986 |
ReplaceAndFailover np -> [ opR np, opF ] |
987 |
FailoverAndReplace ns -> [ opF, opR ns ] |
988 |
|
989 |
-- * Node group functions |
990 |
|
991 |
-- | Computes the group of an instance |
992 |
instanceGroup :: Node.List -> Instance.Instance -> Result Gdx |
993 |
instanceGroup nl i = |
994 |
let sidx = Instance.sNode i |
995 |
pnode = Container.find (Instance.pNode i) nl |
996 |
snode = if sidx == Node.noSecondary |
997 |
then pnode |
998 |
else Container.find sidx nl |
999 |
pgroup = Node.group pnode |
1000 |
sgroup = Node.group snode |
1001 |
in if pgroup /= sgroup |
1002 |
then fail ("Instance placed accross two node groups, primary " ++ |
1003 |
show pgroup ++ ", secondary " ++ show sgroup) |
1004 |
else return pgroup |
1005 |
|
1006 |
-- | Computes the group of an instance per the primary node |
1007 |
instancePriGroup :: Node.List -> Instance.Instance -> Gdx |
1008 |
instancePriGroup nl i = |
1009 |
let pnode = Container.find (Instance.pNode i) nl |
1010 |
in Node.group pnode |
1011 |
|
1012 |
-- | Compute the list of badly allocated instances (split across node |
1013 |
-- groups) |
1014 |
findSplitInstances :: Node.List -> Instance.List -> [Instance.Instance] |
1015 |
findSplitInstances nl il = |
1016 |
filter (not . isOk . instanceGroup nl) (Container.elems il) |
1017 |
|
1018 |
-- | Splits a cluster into the component node groups |
1019 |
splitCluster :: Node.List -> Instance.List -> |
1020 |
[(Gdx, (Node.List, Instance.List))] |
1021 |
splitCluster nl il = |
1022 |
let ngroups = Node.computeGroups (Container.elems nl) |
1023 |
in map (\(guuid, nodes) -> |
1024 |
let nidxs = map Node.idx nodes |
1025 |
nodes' = zip nidxs nodes |
1026 |
instances = Container.filter ((`elem` nidxs) . Instance.pNode) il |
1027 |
in (guuid, (Container.fromList nodes', instances))) ngroups |