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  1. Core Server
  2. SERVER-24994

Assertion when sharded collection is dropped during metadata changes

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 3.2.5
    • Fix Version/s: 3.2.12, 3.4.0-rc4
    • Component/s: Querying, Sharding
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Backport Completed:
    • Backport Requested:
      v3.2
    • Sprint:
      TIG 2016-10-31, TIG 2016-11-21

      Description

      I had a sharded collection that was initialized while the balancer was off. Consequently, tests I was running on that collection skewed the load to a single shard. Seeing this, I enabled the balancer and waited a short time, but then decided that it would be faster for me to start with a new collection. To free resources, I disabled balancing on that collection and then not seeing a large enough decrease in resource usage, tried to delete the whole database.

      From a mongos shell, I tried:

      mongos> db
      zion_patch1_0711_5783d8f5f5adf41d933505e1
      mongos> db.dropDatabase()
      { "code" : 50, "ok" : 0, "errmsg" : "Operation timed out" }
      mongos> db.dropDatabase()
      { "ok" : 0, "errmsg" : "seen a collection twice!" }
      

      Moments later, the primary for the shard crashed with the following assertion:

      2016-07-11T19:19:34.496+0000 I COMMAND  [conn2797] command admin.$cmd command: splitVector { splitVector: "zion_patch1_0711_5783d8f5f5adf41d933505e1.game_ProfileFeedEntry", keyPattern: { account_id: "hashed" }, min: { account_id: -3669295402892714827 }, max: { account_id: -3465469707898765886 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 0, maxChunkObjects: 250000 } keyUpdates:0 writeConflicts:0 numYields:290 reslen:277 locks:{ Global: { acquireCount: { r: 582 } }, MMAPV1Journal: { acquireCount: { r: 588 } }, Database: { acquireCount: { r: 291 }, acquireWaitCount: { r: 6 }, timeAcquiringMicros: { r: 64102 } }, Collection: { acquireCount: { R: 291 }, acquireWaitCount: { R: 291 }, timeAcquiringMicros: { R: 4397253 } } } protocol:op_command 4482ms
      2016-07-11T19:19:34.496+0000 I COMMAND  [conn2815] command admin.$cmd command: splitVector { splitVector: "zion_patch1_0711_5783d8f5f5adf41d933505e1.game_ProfileFeedEntry", keyPattern: { account_id: "hashed" }, min: { account_id: -3669295402892714827 }, max: { account_id: -3465469707898765886 }, maxChunkSizeBytes: 67108864, maxSplitPoints: 0, maxChunkObjects: 250000 } keyUpdates:0 writeConflicts:0 numYields:244 reslen:277 locks:{ Global: { acquireCount: { r: 490 } }, MMAPV1Journal: { acquireCount: { r: 495 } }, Database: { acquireCount: { r: 245 }, acquireWaitCount: { r: 5 }, timeAcquiringMicros: { r: 37828 } }, Collection: { acquireCount: { R: 245 }, acquireWaitCount: { R: 245 }, timeAcquiringMicros: { R: 3664084 } } } protocol:op_command 3720ms
      2016-07-11T19:19:34.500+0000 I -        [RangeDeleter] Invariant failure descriptor src/mongo/db/query/internal_plans.cpp 149
      2016-07-11T19:19:34.500+0000 I -        [RangeDeleter] 
       
      ***aborting after invariant() failure
       
       
      2016-07-11T19:19:34.544+0000 I SHARDING [conn2968] remotely refreshing metadata for zion_patch1_0711_5783d8f5f5adf41d933505e1.game_ProfileFeedEntry with requested shard version 0|0||000000000000000000000000, current shard version is 3|0||5783d918ba74d2d6247ab977, current metadata version is 3|0||5783d918ba74d2d6247ab977
      2016-07-11T19:19:34.545+0000 F -        [RangeDeleter] Got signal: 6 (Aborted).
       
       0x12ff312 0x12fe239 0x12fea42 0x7f6163650340 0x7f61632b1cc9 0x7f61632b50d8 0x1285e4b 0xdcafb9 0xdcb0b9 0xb7a988 0xe19bac 0xe17379 0x1b2b8c0 0x7f6163648182 0x7f616337547d
      ----- BEGIN BACKTRACE -----
      {"backtrace":[{"b":"400000","o":"EFF312","s":"_ZN5mongo15printStackTraceERSo"},{"b":"400000","o":"EFE239"},{"b":"400000","o":"EFEA42"},{"b":"7F6163640000","o":"10340"},{"b":"7F616327B000","o":"36CC9","s":"gsignal"},{"b":"7F616327B000","o":"3A0D8","s":"abort"},{"b":"400000","o":"E85E4B","s":"_ZN5mongo15invariantFailedEPKcS1_j"},{"b":"400000","o":"9CAFB9","s":"_ZN5mongo15InternalPlanner10_indexScanEPNS_16OperationContextEPNS_10WorkingSetEPKNS_10CollectionEPKNS_15IndexDescriptorERKNS_7BSONObjESD_bNS0_9DirectionEi"},{"b":"400000","o":"9CB0B9","s":"_ZN5mongo15InternalPlanner9indexScanEPNS_16OperationContextEPKNS_10CollectionEPKNS_15IndexDescriptorERKNS_7BSONObjESB_bNS_12PlanExecutor11YieldPolicyENS0_9DirectionEi"},{"b":"400000","o":"77A988","s":"_ZN5mongo7Helpers11removeRangeEPNS_16OperationContextERKNS_8KeyRangeEbRKNS_19WriteConcernOptionsEPNS0_11RemoveSaverEbb"},{"b":"400000","o":"A19BAC","s":"_ZN5mongo17RangeDeleterDBEnv11deleteRangeEPNS_16OperationContextERKNS_16RangeDeleteEntryEPxPSs"},{"b":"400000","o":"A17379","s":"_ZN5mongo12RangeDeleter6doWorkEv"},{"b":"400000","o":"172B8C0","s":"execute_native_thread_routine"},{"b":"7F6163640000","o":"8182"},{"b":"7F616327B000","o":"FA47D","s":"clone"}],"processInfo":{ "mongodbVersion" : "3.2.5", "gitVersion" : "34e65e5383f7ea1726332cb175b73077ec4a1b02", "compiledModules" : [], "uname" : { "sysname" : "Linux", "release" : "3.13.0-29-generic", "version" : "#53-Ubuntu SMP Wed Jun 4 21:00:20 UTC 2014", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000", "buildId" : "74F187FDF5E701A36D5188BD90B24583D1430613" }, { "b" : "7FFFF7AFE000", "elfType" : 3, "buildId" : "3D068D088E7EAC15D9DA7C3AC912E783C0897EE7" }, { "b" : "7F6164561000", "path" : "/lib/x86_64-linux-gnu/libssl.so.1.0.0", "elfType" : 3, "buildId" : "A20EFFEC993A8441FA17F2079F923CBD04079E19" }, { "b" : "7F6164186000", "path" : "/lib/x86_64-linux-gnu/libcrypto.so.1.0.0", "elfType" : 3, "buildId" : "F000D29917E9B6E94A35A8F02E5C62846E5916BC" }, { "b" : "7F6163F7E000", "path" : "/lib/x86_64-linux-gnu/librt.so.1", "elfType" : 3, "buildId" : "92FCF41EFE012D6186E31A59AD05BDBB487769AB" }, { "b" : "7F6163D7A000", "path" : "/lib/x86_64-linux-gnu/libdl.so.2", "elfType" : 3, "buildId" : "C1AE4CB7195D337A77A3C689051DABAA3980CA0C" }, { "b" : "7F6163A74000", "path" : "/lib/x86_64-linux-gnu/libm.so.6", "elfType" : 3, "buildId" : "1D76B71E905CB867B27CEF230FCB20F01A3178F5" }, { "b" : "7F616385E000", "path" : "/lib/x86_64-linux-gnu/libgcc_s.so.1", "elfType" : 3, "buildId" : "CC0D578C2E0D86237CA7B0CE8913261C506A629A" }, { "b" : "7F6163640000", "path" : "/lib/x86_64-linux-gnu/libpthread.so.0", "elfType" : 3, "buildId" : "9318E8AF0BFBE444731BB0461202EF57F7C39542" }, { "b" : "7F616327B000", "path" : "/lib/x86_64-linux-gnu/libc.so.6", "elfType" : 3, "buildId" : "30C94DC66A1FE95180C3D68D2B89E576D5AE213C" }, { "b" : "7F61647C0000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3, "buildId" : "9F00581AB3C73E3AEA35995A0C50D24D59A01D47" } ] }}
       mongod(_ZN5mongo15printStackTraceERSo+0x32) [0x12ff312]
       mongod(+0xEFE239) [0x12fe239]
       mongod(+0xEFEA42) [0x12fea42]
       libpthread.so.0(+0x10340) [0x7f6163650340]
       libc.so.6(gsignal+0x39) [0x7f61632b1cc9]
       libc.so.6(abort+0x148) [0x7f61632b50d8]
       mongod(_ZN5mongo15invariantFailedEPKcS1_j+0xCB) [0x1285e4b]
       mongod(_ZN5mongo15InternalPlanner10_indexScanEPNS_16OperationContextEPNS_10WorkingSetEPKNS_10CollectionEPKNS_15IndexDescriptorERKNS_7BSONObjESD_bNS0_9DirectionEi+0x1E9) [0xdcafb9]
       mongod(_ZN5mongo15InternalPlanner9indexScanEPNS_16OperationContextEPKNS_10CollectionEPKNS_15IndexDescriptorERKNS_7BSONObjESB_bNS_12PlanExecutor11YieldPolicyENS0_9DirectionEi+0x89) [0xdcb0b9]
       mongod(_ZN5mongo7Helpers11removeRangeEPNS_16OperationContextERKNS_8KeyRangeEbRKNS_19WriteConcernOptionsEPNS0_11RemoveSaverEbb+0x308) [0xb7a988]
       mongod(_ZN5mongo17RangeDeleterDBEnv11deleteRangeEPNS_16OperationContextERKNS_16RangeDeleteEntryEPxPSs+0x44C) [0xe19bac]
       mongod(_ZN5mongo12RangeDeleter6doWorkEv+0x209) [0xe17379]
       mongod(execute_native_thread_routine+0x20) [0x1b2b8c0]
       libpthread.so.0(+0x8182) [0x7f6163648182]
       libc.so.6(clone+0x6D) [0x7f616337547d]
      -----  END BACKTRACE  -----
      

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