1 {-| Solver for N+1 cluster errors
5 module Main (main) where
9 import Data.Maybe (isJust, fromJust, fromMaybe)
13 import System.Console.GetOpt
14 import qualified System
16 import Text.Printf (printf)
18 import qualified Ganeti.HTools.Container as Container
19 import qualified Ganeti.HTools.Cluster as Cluster
20 import qualified Ganeti.HTools.Node as Node
21 import qualified Ganeti.HTools.CLI as CLI
22 import Ganeti.HTools.IAlloc
23 import Ganeti.HTools.Utils
25 -- | Command line options structure.
26 data Options = Options
27 { optShowNodes :: Bool -- ^ Whether to show node status
28 , optShowCmds :: Maybe FilePath -- ^ Whether to show the command list
29 , optOneline :: Bool -- ^ Switch output to a single line
30 , optNodef :: FilePath -- ^ Path to the nodes file
31 , optNodeSet :: Bool -- ^ The nodes have been set by options
32 , optInstf :: FilePath -- ^ Path to the instances file
33 , optInstSet :: Bool -- ^ The insts have been set by options
34 , optMaxLength :: Int -- ^ Stop after this many steps
35 , optMaster :: String -- ^ Collect data from RAPI
36 , optVerbose :: Int -- ^ Verbosity level
37 , optOffline :: [String] -- ^ Names of offline nodes
38 , optMinScore :: Cluster.Score -- ^ The minimum score we aim for
39 , optShowVer :: Bool -- ^ Just show the program version
40 , optShowHelp :: Bool -- ^ Just show the help
43 -- | Default values for the command line options.
44 defaultOptions :: Options
45 defaultOptions = Options
46 { optShowNodes = False
47 , optShowCmds = Nothing
51 , optInstf = "instances"
62 -- | Options list and functions
63 options :: [OptDescr (Options -> Options)]
65 [ Option ['p'] ["print-nodes"]
66 (NoArg (\ opts -> opts { optShowNodes = True }))
67 "print the final node list"
68 , Option ['C'] ["print-commands"]
69 (OptArg ((\ f opts -> opts { optShowCmds = Just f }) . fromMaybe "-")
71 "print the ganeti command list for reaching the solution,\
72 \if an argument is passed then write the commands to a file named\
74 , Option ['o'] ["oneline"]
75 (NoArg (\ opts -> opts { optOneline = True }))
76 "print the ganeti command list for reaching the solution"
77 , Option ['n'] ["nodes"]
78 (ReqArg (\ f opts -> opts { optNodef = f, optNodeSet = True }) "FILE")
80 , Option ['i'] ["instances"]
81 (ReqArg (\ f opts -> opts { optInstf = f, optInstSet = True }) "FILE")
82 "the instance list FILE"
83 , Option ['m'] ["master"]
84 (ReqArg (\ m opts -> opts { optMaster = m }) "ADDRESS")
85 "collect data via RAPI at the given ADDRESS"
86 , Option ['l'] ["max-length"]
87 (ReqArg (\ i opts -> opts { optMaxLength = (read i)::Int }) "N")
88 "cap the solution at this many moves (useful for very unbalanced \
90 , Option ['v'] ["verbose"]
91 (NoArg (\ opts -> opts { optVerbose = (optVerbose opts) + 1 }))
92 "increase the verbosity level"
93 , Option ['q'] ["quiet"]
94 (NoArg (\ opts -> opts { optVerbose = (optVerbose opts) - 1 }))
95 "decrease the verbosity level"
96 , Option ['O'] ["offline"]
97 (ReqArg (\ n opts -> opts { optOffline = n:optOffline opts }) "NODE")
98 " set node as offline"
99 , Option ['e'] ["min-score"]
100 (ReqArg (\ e opts -> opts { optMinScore = read e }) "EPSILON")
101 " mininum score to aim for"
102 , Option ['V'] ["version"]
103 (NoArg (\ opts -> opts { optShowVer = True}))
104 "show the version of the program"
105 , Option ['h'] ["help"]
106 (NoArg (\ opts -> opts { optShowHelp = True}))
110 {- | Start computing the solution at the given depth and recurse until
111 we find a valid solution or we exceed the maximum depth.
114 iterateDepth :: Cluster.Table -- ^ The starting table
115 -> Int -- ^ Remaining length
116 -> Cluster.NameList -- ^ Node idx to name list
117 -> Cluster.NameList -- ^ Inst idx to name list
118 -> Int -- ^ Max node name len
119 -> Int -- ^ Max instance name len
120 -> [[String]] -- ^ Current command list
121 -> Bool -- ^ Wheter to be silent
122 -> Cluster.Score -- ^ Score at which to stop
123 -> IO (Cluster.Table, [[String]]) -- ^ The resulting table and
125 iterateDepth ini_tbl max_rounds ktn kti nmlen imlen
126 cmd_strs oneline min_score =
127 let Cluster.Table ini_nl ini_il ini_cv ini_plc = ini_tbl
128 all_inst = Container.elems ini_il
129 node_idx = map Node.idx . filter (not . Node.offline) $
130 Container.elems ini_nl
131 fin_tbl = Cluster.checkMove node_idx ini_tbl all_inst
132 (Cluster.Table _ _ fin_cv fin_plc) = fin_tbl
133 ini_plc_len = length ini_plc
134 fin_plc_len = length fin_plc
135 allowed_next = (max_rounds < 0 || length fin_plc < max_rounds)
139 (sol_line, cmds) = Cluster.printSolutionLine ini_il ktn kti
140 nmlen imlen (head fin_plc) fin_plc_len
141 upd_cmd_strs = cmds:cmd_strs
142 unless (oneline || fin_plc_len == ini_plc_len) $ do
145 (if fin_cv < ini_cv then -- this round made success, try deeper
146 if allowed_next && fin_cv > min_score
147 then iterateDepth fin_tbl max_rounds ktn kti
148 nmlen imlen upd_cmd_strs oneline min_score
149 -- don't go deeper, but return the better solution
150 else return (fin_tbl, upd_cmd_strs)
152 return (ini_tbl, cmd_strs))
154 -- | Formats the solution for the oneline display
155 formatOneline :: Double -> Int -> Double -> String
156 formatOneline ini_cv plc_len fin_cv =
157 printf "%.8f %d %.8f %8.3f" ini_cv plc_len fin_cv
158 (if fin_cv == 0 then 1 else (ini_cv / fin_cv))
163 cmd_args <- System.getArgs
164 (opts, args) <- CLI.parseOpts cmd_args "hail" options
165 defaultOptions optShowHelp
167 when (optShowVer opts) $ do
168 putStr $ CLI.showVersion "hbal"
171 when (null args) $ do
172 hPutStrLn stderr "Error: this program needs an input file."
173 exitWith $ ExitFailure 1
175 let input_file = head args
176 input_data <- readFile input_file
178 request <- case (parseData input_data) of
180 putStrLn $ "Error: " ++ err
181 exitWith $ ExitFailure 1
184 putStrLn $ show request
187 (loaded_nl, il, csf, ktn, kti) <- liftM2 Cluster.loadData node_data inst_data
188 let (fix_msgs, fixed_nl) = Cluster.checkData loaded_nl il ktn kti
190 unless (null fix_msgs || verbose == 0) $ do
191 putStrLn "Warning: cluster has inconsistent data:"
192 putStrLn . unlines . map (\s -> printf " - %s" s) $ fix_msgs
194 let offline_names = optOffline opts
195 all_names = snd . unzip $ ktn
196 offline_wrong = filter (\n -> not $ elem n all_names) offline_names
197 offline_indices = fst . unzip .
198 filter (\(_, n) -> elem n offline_names) $ ktn
200 when (length offline_wrong > 0) $ do
201 printf "Wrong node name(s) set as offline: %s\n"
202 (commaJoin offline_wrong)
203 exitWith $ ExitFailure 1
205 let nl = Container.map (\n -> if elem (Node.idx n) offline_indices
206 then Node.setOffline n True
209 when (Container.size il == 0) $ do
211 putStrLn $ formatOneline 0 0 0
213 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) $ do
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) $ do
230 putStrLn "Cluster is not N+1 happy, continuing but no guarantee \
231 \that the cluster will end N+1 happy."
233 when (optShowNodes opts) $
235 putStrLn "Initial cluster status:"
236 putStrLn $ Cluster.printNodes ktn nl
238 let ini_cv = Cluster.compCV nl
239 ini_tbl = Cluster.Table nl il ini_cv []
240 min_cv = optMinScore opts
242 when (ini_cv < min_cv) $ do
244 putStrLn $ formatOneline ini_cv 0 ini_cv
245 else printf "Cluster is already well balanced (initial score %.6g,\n\
246 \minimum score %.6g).\nNothing to do, exiting\n"
250 unless oneline (if verbose > 2 then
251 printf "Initial coefficients: overall %.8f, %s\n"
252 ini_cv (Cluster.printStats nl)
254 printf "Initial score: %.8f\n" ini_cv)
256 unless oneline $ putStrLn "Trying to minimize the CV..."
257 let mlen_fn = maximum . (map length) . snd . unzip
261 (fin_tbl, cmd_strs) <- iterateDepth ini_tbl (optMaxLength opts)
262 ktn kti nmlen imlen [] oneline min_cv
263 let (Cluster.Table fin_nl _ fin_cv fin_plc) = fin_tbl
264 ord_plc = reverse fin_plc
265 sol_msg = if null fin_plc
266 then printf "No solution found\n"
268 then printf "Final coefficients: overall %.8f, %s\n"
269 fin_cv (Cluster.printStats fin_nl)
270 else printf "Cluster score improved from %.8f to %.8f\n"
274 unless oneline $ putStr sol_msg
276 unless (oneline || verbose == 0) $
277 printf "Solution length=%d\n" (length ord_plc)
279 let cmd_data = Cluster.formatCmds . reverse $ cmd_strs
281 when (isJust $ optShowCmds opts) $
283 let out_path = fromJust $ optShowCmds opts
285 (if out_path == "-" then
286 printf "Commands to run to reach the above solution:\n%s"
287 (unlines . map (" " ++) .
288 filter (/= "check") .
291 writeFile out_path (CLI.shTemplate ++ cmd_data)
292 printf "The commands have been written to file '%s'\n" out_path)
294 when (optShowNodes opts) $
296 let (orig_mem, orig_disk) = Cluster.totalResources nl
297 (final_mem, final_disk) = Cluster.totalResources fin_nl
299 putStrLn "Final cluster status:"
300 putStrLn $ Cluster.printNodes ktn fin_nl
303 printf "Original: mem=%d disk=%d\n" orig_mem orig_disk
304 printf "Final: mem=%d disk=%d\n" final_mem final_disk
306 putStrLn $ formatOneline ini_cv (length ord_plc) fin_cv