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
80 {- | Start computing the solution at the given depth and recurse until
81 we find a valid solution or we exceed the maximum depth.
84 iterateDepth :: Cluster.Table -- ^ The starting table
85 -> Int -- ^ Remaining length
86 -> Bool -- ^ Allow disk moves
87 -> Int -- ^ Max node name len
88 -> Int -- ^ Max instance name len
89 -> [MoveJob] -- ^ Current command list
90 -> Bool -- ^ Whether to be silent
91 -> Score -- ^ Score at which to stop
92 -> IO (Cluster.Table, [MoveJob]) -- ^ The resulting table
94 iterateDepth ini_tbl max_rounds disk_moves nmlen imlen
95 cmd_strs oneline min_score =
96 let Cluster.Table ini_nl ini_il _ _ = ini_tbl
97 m_fin_tbl = Cluster.tryBalance ini_tbl max_rounds disk_moves min_score
103 (Cluster.Table _ _ _ fin_plc) = fin_tbl
104 fin_plc_len = length fin_plc
105 cur_plc@(idx, _, _, move, _) = head fin_plc
106 (sol_line, cmds) = Cluster.printSolutionLine ini_nl ini_il
107 nmlen imlen cur_plc fin_plc_len
108 afn = Cluster.involvedNodes ini_il cur_plc
109 upd_cmd_strs = (afn, idx, move, cmds):cmd_strs
113 iterateDepth fin_tbl max_rounds disk_moves
114 nmlen imlen upd_cmd_strs oneline min_score
115 Nothing -> return (ini_tbl, cmd_strs)
117 -- | Formats the solution for the oneline display
118 formatOneline :: Double -> Int -> Double -> String
119 formatOneline ini_cv plc_len fin_cv =
120 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
121 (if fin_cv == 0 then 1 else ini_cv / fin_cv)
123 -- | Submits a list of jobs and waits for all to finish execution
124 execJobs :: L.Client -> [[OpCodes.OpCode]] -> IO (Result [String])
125 execJobs client = L.submitManyJobs client . showJSON
127 -- | Polls a set of jobs at a fixed interval until all are finished
128 -- one way or another
129 waitForJobs :: L.Client -> [String] -> IO (Result [JobStatus])
130 waitForJobs client jids = do
131 sts <- L.queryJobsStatus client jids
133 Bad x -> return $ Bad x
134 Ok s -> if any (<= JobRunning) s
136 -- TODO: replace hardcoded value with a better thing
137 threadDelay (1000000 * 15)
138 waitForJobs client jids
141 -- | Check that a set of job statuses is all success
142 checkJobsStatus :: [JobStatus] -> Bool
143 checkJobsStatus = all (== JobSuccess)
145 -- | Execute an entire jobset
146 execJobSet :: String -> String -> Node.List
147 -> Instance.List -> [JobSet] -> IO ()
148 execJobSet _ _ _ _ [] = return ()
149 execJobSet master csf nl il (js:jss) = do
150 -- map from jobset (htools list of positions) to [[opcodes]]
151 let jobs = map (\(_, idx, move, _) ->
152 Cluster.iMoveToJob csf nl il idx move) js
153 let descr = map (\(_, idx, _, _) -> Container.nameOf il idx) js
154 putStrLn $ "Executing jobset for instances " ++ commaJoin descr
155 jrs <- bracket (L.getClient master) L.closeClient
157 jids <- execJobs client jobs
159 Bad x -> return $ Bad x
161 putStrLn $ "Got job IDs " ++ commaJoin x
166 hPutStrLn stderr $ "Cannot compute job status, aborting: " ++ show x
168 Ok x -> if checkJobsStatus x
169 then execJobSet master csf nl il jss
171 hPutStrLn stderr $ "Not all jobs completed successfully: " ++
173 hPutStrLn stderr "Aborting.")
178 cmd_args <- System.getArgs
179 (opts, args) <- parseOpts cmd_args "hbal" options
181 unless (null args) $ do
182 hPutStrLn stderr "Error: this program doesn't take any arguments."
183 exitWith $ ExitFailure 1
185 let oneline = optOneline opts
186 verbose = optVerbose opts
187 shownodes = optShowNodes opts
189 (fixed_nl, il, csf) <- loadExternalData opts
191 let offline_names = optOffline opts
192 all_nodes = Container.elems fixed_nl
193 all_names = map Node.name all_nodes
194 offline_wrong = filter (flip notElem all_names) offline_names
195 offline_indices = map Node.idx $
196 filter (\n -> elem (Node.name n) offline_names)
201 when (length offline_wrong > 0) $ do
202 hPrintf stderr "Wrong node name(s) set as offline: %s\n"
203 (commaJoin offline_wrong)
204 exitWith $ ExitFailure 1
206 let nm = Container.map (\n -> if elem (Node.idx n) offline_indices
207 then Node.setOffline n True
209 nl = Container.map (flip Node.setMdsk m_dsk . flip Node.setMcpu m_cpu)
212 when (Container.size il == 0) $ do
213 (if oneline then putStrLn $ formatOneline 0 0 0
214 else printf "Cluster is empty, exiting.\n")
217 unless oneline $ printf "Loaded %d nodes, %d instances\n"
221 when (length csf > 0 && not oneline && verbose > 1) $
222 printf "Note: Stripping common suffix of '%s' from names\n" csf
224 let (bad_nodes, bad_instances) = Cluster.computeBadItems nl il
225 unless (oneline || verbose == 0) $ printf
226 "Initial check done: %d bad nodes, %d bad instances.\n"
227 (length bad_nodes) (length bad_instances)
229 when (length bad_nodes > 0) $
230 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
231 \that the cluster will end N+1 happy."
233 when (optShowInsts opts) $ do
235 putStrLn "Initial instance map:"
236 putStrLn $ Cluster.printInsts nl il
238 when (isJust shownodes) $
240 putStrLn "Initial cluster status:"
241 putStrLn $ Cluster.printNodes nl (fromJust shownodes)
243 let ini_cv = Cluster.compCV nl
244 ini_tbl = Cluster.Table nl il ini_cv []
245 min_cv = optMinScore opts
247 when (ini_cv < min_cv) $ do
249 putStrLn $ formatOneline ini_cv 0 ini_cv
250 else printf "Cluster is already well balanced (initial score %.6g,\n\
251 \minimum score %.6g).\nNothing to do, exiting\n"
255 unless oneline (if verbose > 2 then
256 printf "Initial coefficients: overall %.8f, %s\n"
257 ini_cv (Cluster.printStats nl)
259 printf "Initial score: %.8f\n" ini_cv)
261 unless oneline $ putStrLn "Trying to minimize the CV..."
262 let imlen = Container.maxNameLen il
263 nmlen = Container.maxNameLen nl
265 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
267 nmlen imlen [] oneline min_cv
268 let (Cluster.Table fin_nl fin_il fin_cv fin_plc) = fin_tbl
269 ord_plc = reverse fin_plc
270 sol_msg = if null fin_plc
271 then printf "No solution found\n"
273 then printf "Final coefficients: overall %.8f, %s\n"
274 fin_cv (Cluster.printStats fin_nl)
275 else printf "Cluster score improved from %.8f to %.8f\n"
279 unless oneline $ putStr sol_msg
281 unless (oneline || verbose == 0) $
282 printf "Solution length=%d\n" (length ord_plc)
284 let cmd_jobs = Cluster.splitJobs cmd_strs
285 cmd_data = Cluster.formatCmds cmd_jobs
287 when (isJust $ optShowCmds opts) $
289 let out_path = fromJust $ optShowCmds opts
291 (if out_path == "-" then
292 printf "Commands to run to reach the above solution:\n%s"
293 (unlines . map (" " ++) .
294 filter (/= " check") .
297 writeFile out_path (shTemplate ++ cmd_data)
298 printf "The commands have been written to file '%s'\n" out_path)
300 when (optExecJobs opts && not (null ord_plc))
301 (case optLuxi opts of
303 hPutStrLn stderr "Execution of commands possible only on LUXI"
304 exitWith $ ExitFailure 1
305 Just master -> execJobSet master csf fin_nl il cmd_jobs)
307 when (optShowInsts opts) $ do
309 putStrLn "Final instance map:"
310 putStr $ Cluster.printInsts fin_nl fin_il
312 when (isJust shownodes) $
314 let ini_cs = Cluster.totalResources nl
315 fin_cs = Cluster.totalResources fin_nl
317 putStrLn "Final cluster status:"
318 putStrLn $ Cluster.printNodes fin_nl (fromJust shownodes)
321 printf "Original: mem=%d disk=%d\n"
322 (Cluster.csFmem ini_cs) (Cluster.csFdsk ini_cs)
323 printf "Final: mem=%d disk=%d\n"
324 (Cluster.csFmem fin_cs) (Cluster.csFdsk fin_cs)
326 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv