7 Copyright (C) 2009 Google Inc.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 module Main (main) where
28 import Control.Concurrent (threadDelay)
29 import Control.Exception (bracket)
32 import Data.Maybe (isJust, fromJust)
36 import qualified System
38 import Text.Printf (printf, hPrintf)
39 import Text.JSON (showJSON)
41 import qualified Ganeti.HTools.Container as Container
42 import qualified Ganeti.HTools.Cluster as Cluster
43 import qualified Ganeti.HTools.Node as Node
44 import qualified Ganeti.HTools.Instance as Instance
46 import Ganeti.HTools.CLI
47 import Ganeti.HTools.ExtLoader
48 import Ganeti.HTools.Utils
49 import Ganeti.HTools.Types
51 import qualified Ganeti.Luxi as L
52 import qualified Ganeti.OpCodes as OpCodes
55 -- | Options list and functions
78 {- | Start computing the solution at the given depth and recurse until
79 we find a valid solution or we exceed the maximum depth.
82 iterateDepth :: Cluster.Table -- ^ The starting table
83 -> Int -- ^ Remaining length
84 -> Bool -- ^ Allow disk moves
85 -> Int -- ^ Max node name len
86 -> Int -- ^ Max instance name len
87 -> [MoveJob] -- ^ Current command list
88 -> Bool -- ^ Whether to be silent
89 -> Score -- ^ Score at which to stop
90 -> IO (Cluster.Table, [MoveJob]) -- ^ The resulting table
92 iterateDepth ini_tbl max_rounds disk_moves nmlen imlen
93 cmd_strs oneline min_score =
94 let Cluster.Table ini_nl ini_il _ _ = ini_tbl
95 m_fin_tbl = Cluster.tryBalance ini_tbl max_rounds disk_moves min_score
101 (Cluster.Table _ _ _ fin_plc) = fin_tbl
102 fin_plc_len = length fin_plc
103 cur_plc@(idx, _, _, move, _) = head fin_plc
104 (sol_line, cmds) = Cluster.printSolutionLine ini_nl ini_il
105 nmlen imlen cur_plc fin_plc_len
106 afn = Cluster.involvedNodes ini_il cur_plc
107 upd_cmd_strs = (afn, idx, move, cmds):cmd_strs
111 iterateDepth fin_tbl max_rounds disk_moves
112 nmlen imlen upd_cmd_strs oneline min_score
113 Nothing -> return (ini_tbl, cmd_strs)
115 -- | Formats the solution for the oneline display
116 formatOneline :: Double -> Int -> Double -> String
117 formatOneline ini_cv plc_len fin_cv =
118 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
119 (if fin_cv == 0 then 1 else ini_cv / fin_cv)
121 -- | Submits a list of jobs and waits for all to finish execution
122 execJobs :: L.Client -> [[OpCodes.OpCode]] -> IO (Result [String])
123 execJobs client = L.submitManyJobs client . showJSON
125 -- | Polls a set of jobs at a fixed interval until all are finished
126 -- one way or another
127 waitForJobs :: L.Client -> [String] -> IO (Result [JobStatus])
128 waitForJobs client jids = do
129 sts <- L.queryJobsStatus client jids
131 Bad x -> return $ Bad x
132 Ok s -> if any (<= JobRunning) s
134 -- TODO: replace hardcoded value with a better thing
135 threadDelay (1000000 * 15)
136 waitForJobs client jids
139 -- | Check that a set of job statuses is all success
140 checkJobsStatus :: [JobStatus] -> Bool
141 checkJobsStatus = all (== JobSuccess)
143 -- | Execute an entire jobset
144 execJobSet :: String -> String -> Node.List
145 -> Instance.List -> [JobSet] -> IO ()
146 execJobSet _ _ _ _ [] = return ()
147 execJobSet master csf nl il (js:jss) = do
148 -- map from jobset (htools list of positions) to [[opcodes]]
149 let jobs = map (\(_, idx, move, _) ->
150 Cluster.iMoveToJob csf nl il idx move) js
151 let descr = map (\(_, idx, _, _) -> Container.nameOf il idx) js
152 putStrLn $ "Executing jobset for instances " ++ commaJoin descr
153 jrs <- bracket (L.getClient master) L.closeClient
155 jids <- execJobs client jobs
157 Bad x -> return $ Bad x
159 putStrLn $ "Got job IDs " ++ commaJoin x
164 hPutStrLn stderr $ "Cannot compute job status, aborting: " ++ show x
166 Ok x -> if checkJobsStatus x
167 then execJobSet master csf nl il jss
169 hPutStrLn stderr $ "Not all jobs completed successfully: " ++
171 hPutStrLn stderr "Aborting.")
176 cmd_args <- System.getArgs
177 (opts, args) <- parseOpts cmd_args "hbal" options
179 unless (null args) $ do
180 hPutStrLn stderr "Error: this program doesn't take any arguments."
181 exitWith $ ExitFailure 1
183 let oneline = optOneline opts
184 verbose = optVerbose opts
186 (fixed_nl, il, csf) <- loadExternalData opts
188 let offline_names = optOffline opts
189 all_nodes = Container.elems fixed_nl
190 all_names = map Node.name all_nodes
191 offline_wrong = filter (flip notElem all_names) offline_names
192 offline_indices = map Node.idx $
193 filter (\n -> elem (Node.name n) offline_names)
198 when (length offline_wrong > 0) $ do
199 hPrintf stderr "Wrong node name(s) set as offline: %s\n"
200 (commaJoin offline_wrong)
201 exitWith $ ExitFailure 1
203 let nm = Container.map (\n -> if elem (Node.idx n) offline_indices
204 then Node.setOffline n True
206 nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)
209 when (Container.size il == 0) $ do
210 (if oneline then putStrLn $ formatOneline 0 0 0
211 else printf "Cluster is empty, exiting.\n")
214 unless oneline $ printf "Loaded %d nodes, %d instances\n"
218 when (length csf > 0 && not oneline && verbose > 1) $
219 printf "Note: Stripping common suffix of '%s' from names\n" csf
221 let (bad_nodes, bad_instances) = Cluster.computeBadItems nl il
222 unless (oneline || verbose == 0) $ printf
223 "Initial check done: %d bad nodes, %d bad instances.\n"
224 (length bad_nodes) (length bad_instances)
226 when (length bad_nodes > 0) $
227 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
228 \that the cluster will end N+1 happy."
230 when (optShowNodes opts) $
232 putStrLn "Initial cluster status:"
233 putStrLn $ Cluster.printNodes nl
235 let ini_cv = Cluster.compCV nl
236 ini_tbl = Cluster.Table nl il ini_cv []
237 min_cv = optMinScore opts
239 when (ini_cv < min_cv) $ do
241 putStrLn $ formatOneline ini_cv 0 ini_cv
242 else printf "Cluster is already well balanced (initial score %.6g,\n\
243 \minimum score %.6g).\nNothing to do, exiting\n"
247 unless oneline (if verbose > 2 then
248 printf "Initial coefficients: overall %.8f, %s\n"
249 ini_cv (Cluster.printStats nl)
251 printf "Initial score: %.8f\n" ini_cv)
253 unless oneline $ putStrLn "Trying to minimize the CV..."
254 let imlen = Container.maxNameLen il
255 nmlen = Container.maxNameLen nl
257 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
259 nmlen imlen [] oneline min_cv
260 let (Cluster.Table fin_nl _ fin_cv fin_plc) = fin_tbl
261 ord_plc = reverse fin_plc
262 sol_msg = if null fin_plc
263 then printf "No solution found\n"
265 then printf "Final coefficients: overall %.8f, %s\n"
266 fin_cv (Cluster.printStats fin_nl)
267 else printf "Cluster score improved from %.8f to %.8f\n"
271 unless oneline $ putStr sol_msg
273 unless (oneline || verbose == 0) $
274 printf "Solution length=%d\n" (length ord_plc)
276 let cmd_jobs = Cluster.splitJobs cmd_strs
277 cmd_data = Cluster.formatCmds cmd_jobs
279 when (isJust $ optShowCmds opts) $
281 let out_path = fromJust $ optShowCmds opts
283 (if out_path == "-" then
284 printf "Commands to run to reach the above solution:\n%s"
285 (unlines . map (" " ++) .
286 filter (/= " check") .
289 writeFile out_path (shTemplate ++ cmd_data)
290 printf "The commands have been written to file '%s'\n" out_path)
292 when (optExecJobs opts && not (null ord_plc))
293 (case optLuxi opts of
295 hPutStrLn stderr "Execution of commands possible only on LUXI"
296 exitWith $ ExitFailure 1
297 Just master -> execJobSet master csf fin_nl il cmd_jobs)
299 when (optShowNodes opts) $
301 let ini_cs = Cluster.totalResources nl
302 fin_cs = Cluster.totalResources fin_nl
304 putStrLn "Final cluster status:"
305 putStrLn $ Cluster.printNodes fin_nl
308 printf "Original: mem=%d disk=%d\n"
309 (Cluster.csFmem ini_cs) (Cluster.csFdsk ini_cs)
310 printf "Final: mem=%d disk=%d\n"
311 (Cluster.csFmem fin_cs) (Cluster.csFdsk fin_cs)
313 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv