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  1. Core Server
  2. SERVER-16567

extend data directory metadata to hold storage engine creation settings for startup validation

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 2.8.0-rc2
    • Fix Version/s: 2.8.0-rc5
    • Component/s: Storage
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible

      Description

      Extend data directory metadata (introduced in SERVER-15986) to hold creation settings (derived from startup options). These creation settings will be validated by the storage engine on restart.

      On startup, the storage engine will check the current configuration/startup options against the creation settings stored in the metadata. If an inconsistency is detected, the server will fail to start up.

      ---------------

      In attempt to emulate something a user might inadvertently do, I started mongod with directoryForIndexes and added an index to an existing collection.

      1) mongod now had some indexes in top level data directory and some in "index" subdirectory of data directory

      I now emulated a partial backup by bringing down mongod, and removing "index" directory - this is what would happen if index was mounted on another physical device and a snapshot of just data directory was taken (leaving all or some indexes behind). I now brought up mongod and ran db.collection.getIndexes and db.collection.find( <query-using-new-index>).explain() and same find with explain(true).

      The first two commands succeeded with correct output, but actually forcing the running of the indexed query crashed the server with:

      2014-12-16T13:40:33.565-0500 E STORAGE  [conn1] WiredTiger (2) [1418755233:565872][29294:0x111c67000], file:index/1--3930778720722776466.wt, session.open_cursor: /data/wt/index/1--3930778720722776466.wt: No such file or directory
      2014-12-16T13:40:33.566-0500 E STORAGE  [conn1] no cursor for uri: table:index/1--3930778720722776466
      2014-12-16T13:40:33.567-0500 F -        [conn1] Invalid access at address: 0x30
      2014-12-16T13:40:33.599-0500 F -        [conn1] Got signal: 11 (Segmentation fault: 11).
       
       0x10ec99839 0x10ec993fe 0x7fff8e7fe5aa 0xc0 0x10eac8810 0x10e80daf4 0x10e7839b8 0x10e783d1c 0x10e77575e 0x10e94fcc7 0x10e9503b8 0x10e91939d 0x10e6cc9b9 0x10e6c5268 0x10e7444fa 0x10e74561e 0x10e74626c 0x10e91eaf1 0x10e8202b9 0x10e574d31 0x10ec5d376 0x10eccd551 0x7fff8ef59899 0x7fff8ef5972a 0x7fff8ef5dfc9
      ----- BEGIN BACKTRACE -----
      {"backtrace":[{"b":"10E56A000","o":"72F839"},{"b":"10E56A000","o":"72F3FE"},{"b":"7FFF8E7FB000","o":"35AA"},{"b":"0","o":"C0"},{"b":"10E56A000","o":"55E810"},{"b":"10E56A000","o":"2A3AF4"},{"b":"10E56A000","o":"2199B8"},{"b":"10E56A000","o":"219D1C"},{"b":"10E56A000","o":"20B75E"},{"b":"10E56A000","o":"3E5CC7"},{"b":"10E56A000","o":"3E63B8"},{"b":"10E56A000","o":"3AF39D"},{"b":"10E56A000","o":"1629B9"},{"b":"10E56A000","o":"15B268"},{"b":"10E56A000","o":"1DA4FA"},{"b":"10E56A000","o":"1DB61E"},{"b":"10E56A000","o":"1DC26C"},{"b":"10E56A000","o":"3B4AF1"},{"b":"10E56A000","o":"2B62B9"},{"b":"10E56A000","o":"AD31"},{"b":"10E56A000","o":"6F3376"},{"b":"10E56A000","o":"763551"},{"b":"7FFF8EF58000","o":"1899"},{"b":"7FFF8EF58000","o":"172A"},{"b":"7FFF8EF58000","o":"5FC9"}],"processInfo":{ "mongodbVersion" : "2.8.0-rc2", "gitVersion" : "f77869e01a6ed235695a46fad441c0dff15202f6", "uname" : { "sysname" : "Darwin", "release" : "13.4.0", "version" : "Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64", "machine" : "x86_64" }, "somap" : [ { "path" : "/Users/asya/bins/mongodb-osx-x86_64-2.8.0-rc2/bin/mongod", "machType" : 2, "b" : "10E56A000", "buildId" : "5E5E1684499B308383920314F3A9D5EA" }, { "path" : "/usr/lib/libSystem.B.dylib", "machType" : 6, "b" : "7FFF89164000", "buildId" : "E303F2F8A8CF3DF384B3F2D0EE41CCF6" }, { "path" : "/usr/lib/libc++.1.dylib", "machType" : 6, "b" : "7FFF8FD8B000", "buildId" : "2CB96D101E3E39B1B90DC56C3818321E" }, { "path" : "/usr/lib/system/libcache.dylib", "machType" : 6, "b" : "7FFF933AC000", "buildId" : "8C1EFC4F3F513DE9A973360B461F3D65" }, { "path" : "/usr/lib/system/libcommonCrypto.dylib", "machType" : 6, "b" : "7FFF890C2000", "buildId" : "79B8E80FE59633028243EC479B9546CA" }, { "path" : "/usr/lib/system/libcompiler_rt.dylib", "machType" : 6, "b" : "7FFF88E61000", "buildId" : "2A8900040A783E339AC5A7D63BD4F879" }, { "path" : "/usr/lib/system/libcopyfile.dylib", "machType" : 6, "b" : "7FFF8B211000", "buildId" : "CF29DFF605893590834C82E2316612E8" }, { "path" : "/usr/lib/system/libcorecrypto.dylib", "machType" : 6, "b" : "7FFF890F5000", "buildId" : "F3973C2814B63006BB2B00DD7F09ABC7" }, { "path" : "/usr/lib/system/libdispatch.dylib", "machType" : 6, "b" : "7FFF95CD7000", "buildId" : "C4E4A18D3C3B3C9C8709A4270D998DE7" }, { "path" : "/usr/lib/system/libdyld.dylib", "machType" : 6, "b" : "7FFF890CD000", "buildId" : "7C9EC3B7DDE333FF953F4067C743951D" }, { "path" : "/usr/lib/system/libkeymgr.dylib", "machType" : 6, "b" : "7FFF8AF23000", "buildId" : "D7045F25BFA43840847DAF95DF8B6CCA" }, { "path" : "/usr/lib/system/liblaunch.dylib", "machType" : 6, "b" : "7FFF8F941000", "buildId" : "A40A0C7B321639B48AE0B5D3BAF1DA8A" }, { "path" : "/usr/lib/system/libmacho.dylib", "machType" : 6, "b" : "7FFF8D7A5000", "buildId" : "B2BE3C25CF1F309BAB991F0B54621445" }, { "path" : "/usr/lib/system/libquarantine.dylib", "machType" : 6, "b" : "7FFF88E5E000", "buildId" : "973BE51D6465392F9099D4AB21BF0D25" }, { "path" : "/usr/lib/system/libremovefile.dylib", "machType" : 6, "b" : "7FFF8D29E000", "buildId" : "26266E3FFDDC3CFCB27F78B49BDC9BDC" }, { "path" : "/usr/lib/system/libsystem_asl.dylib", "machType" : 6, "b" : "7FFF90FA1000", "buildId" : "B983CA60F418317BB14248A6376564FC" }, { "path" : "/usr/lib/system/libsystem_blocks.dylib", "machType" : 6, "b" : "7FFF8E302000", "buildId" : "FB856CD12AEA39078E9B1E54B6827F82" }, { "path" : "/usr/lib/system/libsystem_c.dylib", "machType" : 6, "b" : "7FFF8B094000", "buildId" : "6FD3A4004BB23B95B90CBE6E9D0D78FA" }, { "path" : "/usr/lib/system/libsystem_configuration.dylib", "machType" : 6, "b" : "7FFF890BF000", "buildId" : "4998CB6A9D54390A9F575D1AC53C135C" }, { "path" : "/usr/lib/system/libsystem_dnssd.dylib", "machType" : 6, "b" : "7FFF949CE000", "buildId" : "17B03FFD92C532829981EBB28B456207" }, { "path" : "/usr/lib/system/libsystem_info.dylib", "machType" : 6, "b" : "7FFF8F010000", "buildId" : "395D8CD6616A3BD3A195C6D68EB9AB22" }, { "path" : "/usr/lib/system/libsystem_kernel.dylib", "machType" : 6, "b" : "7FFF8A192000", "buildId" : "9EDE872E2A9E3A788E1DAB790794A098" }, { "path" : "/usr/lib/system/libsystem_m.dylib", "machType" : 6, "b" : "7FFF8CF24000", "buildId" : "9D96AACD58703A5CB8497F9C0F6EBB09" }, { "path" : "/usr/lib/system/libsystem_malloc.dylib", "machType" : 6, "b" : "7FFF8B13A000", "buildId" : "A695B4E438E9332EA77229D31E3F1385" }, { "path" : "/usr/lib/system/libsystem_network.dylib", "machType" : 6, "b" : "7FFF93D81000", "buildId" : "A499D688916537768C8EC018897B5B13" }, { "path" : "/usr/lib/system/libsystem_notify.dylib", "machType" : 6, "b" : "7FFF90247000", "buildId" : "9B34B4FEF5AD3F09A5F046AFF3571323" }, { "path" : "/usr/lib/system/libsystem_platform.dylib", "machType" : 6, "b" : "7FFF8E7FB000", "buildId" : "3C3D3DA832B9324398ECD89B9A1670B3" }, { "path" : "/usr/lib/system/libsystem_pthread.dylib", "machType" : 6, "b" : "7FFF8EF58000", "buildId" : "9DA50FD0D9AC3051AD4BBA0D745BC49C" }, { "path" : "/usr/lib/system/libsystem_sandbox.dylib", "machType" : 6, "b" : "7FFF942DC000", "buildId" : "0D0B13EA6B7A3AC8BE60B548543BEB77" }, { "path" : "/usr/lib/system/libsystem_stats.dylib", "machType" : 6, "b" : "7FFF88B12000", "buildId" : "4E51D5B092A03D0DB90E495A1ED3E391" }, { "path" : "/usr/lib/system/libunc.dylib", "machType" : 6, "b" : "7FFF90856000", "buildId" : "C3737C9AC06F310CB78C7D8D882A35DE" }, { "path" : "/usr/lib/system/libunwind.dylib", "machType" : 6, "b" : "7FFF8C25C000", "buildId" : "95D4D11833683474989D271DE18C8365" }, { "path" : "/usr/lib/system/libxpc.dylib", "machType" : 6, "b" : "7FFF8E26F000", "buildId" : "AB40CD57F4543FD4B41563B3C0D5C624" }, { "path" : "/usr/lib/libobjc.A.dylib", "machType" : 6, "b" : "7FFF8F0EE000", "buildId" : "F21C57427B9C31F1BBAE1717BC6C2F1B" }, { "path" : "/usr/lib/libauto.dylib", "machType" : 6, "b" : "7FFF8EFC0000", "buildId" : "F45C36E8B6063886B5B1B6745E757CA8" }, { "path" : "/usr/lib/libc++abi.dylib", "machType" : 6, "b" : "7FFF8FDEF000", "buildId" : "21A807D367323455B77F743E9F916DF0" }, { "path" : "/usr/lib/libDiagnosticMessagesClient.dylib", "machType" : 6, "b" : "7FFF8CAD0000", "buildId" : "4CDB0F7BC0AF3424BC39495696F0DB1E" } ] }}
       mongod(_ZN5mongo15printStackTraceERNSt3__113basic_ostreamIcNS0_11char_traitsIcEEEE+0x39) [0x10ec99839]
       mongod(_ZN5mongo12_GLOBAL__N_124abruptQuitWithAddrSignalEiP9__siginfoPv+0x11E) [0x10ec993fe]
       libsystem_platform.dylib(_sigtramp+0x1A) [0x7fff8e7fe5aa]
       ??? [0xc0]
       mongod(_ZN5mongo15WiredTigerIndex11IndexCursor9advanceToERKNS_7BSONObjEibRKNSt3__16vectorIPKNS_11BSONElementENS5_9allocatorIS9_EEEERKNS6_IbNSA_IbEEEE+0x60) [0x10eac8810]
       mongod(_ZN5mongo16BtreeIndexCursor4seekERKNSt3__16vectorIPKNS_11BSONElementENS1_9allocatorIS5_EEEERKNS2_IbNS6_IbEEEE+0x44) [0x10e80daf4]
       mongod(_ZN5mongo9IndexScan13initIndexScanEv+0x338) [0x10e7839b8]
       mongod(_ZN5mongo9IndexScan4workEPm+0x4C) [0x10e783d1c]
       mongod(_ZN5mongo10FetchStage4workEPm+0x10E) [0x10e77575e]
       mongod(_ZN5mongo12PlanExecutor7getNextEPNS_7BSONObjEPNS_8RecordIdE+0x97) [0x10e94fcc7]
       mongod(_ZN5mongo12PlanExecutor11executePlanEv+0x58) [0x10e9503b8]
       mongod(_ZN5mongo7Explain13explainStagesEPNS_12PlanExecutorENS_13ExplainCommon9VerbosityEPNS_14BSONObjBuilderE+0x6D) [0x10e91939d]
       mongod(_ZNK5mongo7FindCmd7explainEPNS_16OperationContextERKNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEERKNS_7BSONObjENS_13ExplainCommon9VerbosityEPNS_14BSONObjBuilderE+0x2A9) [0x10e6cc9b9]
       mongod(_ZN5mongo10CmdExplain3runEPNS_16OperationContextERKNSt3__112basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEERNS_7BSONObjEiRS9_RNS_14BSONObjBuilderEb+0x248) [0x10e6c5268]
       mongod(_ZN5mongo12_execCommandEPNS_16OperationContextEPNS_7CommandERKNSt3__112basic_stringIcNS4_11char_traitsIcEENS4_9allocatorIcEEEERNS_7BSONObjEiRSA_RNS_14BSONObjBuilderEb+0x3A) [0x10e7444fa]
       mongod(_ZN5mongo7Command11execCommandEPNS_16OperationContextEPS0_iPKcRNS_7BSONObjERNS_14BSONObjBuilderEb+0xBDE) [0x10e74561e]
       mongod(_ZN5mongo12_runCommandsEPNS_16OperationContextEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi+0x47C) [0x10e74626c]
       mongod(_ZN5mongo8runQueryEPNS_16OperationContextERNS_7MessageERNS_12QueryMessageERNS_5CurOpES3_b+0xF61) [0x10e91eaf1]
       mongod(_ZN5mongo16assembleResponseEPNS_16OperationContextERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortEb+0x9D9) [0x10e8202b9]
       mongod(_ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE+0xE1) [0x10e574d31]
       mongod(_ZN5mongo17PortMessageServer17handleIncomingMsgEPv+0x526) [0x10ec5d376]
       mongod(_ZN5boost12_GLOBAL__N_112thread_proxyEPv+0xB1) [0x10eccd551]
       libsystem_pthread.dylib(_pthread_body+0x8A) [0x7fff8ef59899]
       libsystem_pthread.dylib(_pthread_struct_init+0x0) [0x7fff8ef5972a]
       libsystem_pthread.dylib(thread_start+0xD) [0x7fff8ef5dfc9]
      -----  END BACKTRACE  -----

      So it would be nice to make sure that on startup _mdb metadata matches expected files? Also not sure that allowing a mix with in subdirectory and not in subdirectory indexes is a good idea (same problem would probably happen if I mistakenly start mongod without directoryForIndexes flag - it would be like index files disappeared while being in metadata).

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              Assignee:
              benety.goh Benety Goh
              Reporter:
              asya Asya Kamsky
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                Created:
                Updated:
                Resolved: