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  1. Core Server
  2. SERVER-23296

Recipient shard should check that the collection has not been dropped

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: 3.3.4
    • Fix Version/s: 3.3.4
    • Component/s: Sharding
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL
    • Sprint:
      Sharding 12 (04/01/16)
    • Linked BF Score:
      0

      Description

      The migration destination manager checks whether the collection metadata version has the expected value at the end of the migration cycle. This check happens by querying the collection's cached metadata.

      If a database gets dropped while migration is happening though, the collection metadata will be null and the check crashes with null pointer exception:

      [js_test:zbigMapReduce] 2016-03-21T19:17:53.059+0000 d20762| ----- BEGIN BACKTRACE -----
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.063+0000 d20762| {"backtrace":[{"b":"400000","o":"F37A72","s":"_ZN5mongo15printStackTraceERSo"},{"b":"400000","o":"F36979"},{"b":"400000","o":"F36CF8"},{"b":"400000","o":"10E9493"},{"b":"2AAD08346000","o":"ECA0"},{"b":"400000","o":"BC58BB","s":"_ZN5mongo13ShardingState13forgetPendingEPNS_16OperationContextERKSsRKNS_7BSONObjES7_RKNS_3OIDEPSs"},{"b":"400000","o":"BA9EDC","s":"_ZN5mongo27MigrationDestinationManager14_migrateThreadESsNS_18MigrationSessionIdENS_7BSONObjES2_S2_SsNS_3OIDENS_19WriteConcernOptionsE"},{"b":"400000","o":"BAA361"},{"b":"400000","o":"194ED60"},{"b":"2AAD08346000","o":"683D"},{"b":"2AAD08563000","o":"D4FDD","s":"clone"}],"processInfo":{ "mongodbVersion" : "3.3.3-77-g8724837", "gitVersion" : "8724837bfe66e20c5ea65fc43457896e9dfc6a8a", "compiledModules" : [], "uname" : { "sysname" : "Linux", "release" : "2.6.18-194.el5xen", "version" : "#1 SMP Tue Mar 16 22:01:26 EDT 2010", "machine" : "x86_64" }, "somap" : [ { "elfType" : 2, "b" : "400000" }, { "b" : "2AAD077A7000", "path" : "/lib64/librt.so.1", "elfType" : 3 }, { "b" : "2AAD079B0000", "path" : "/lib64/libdl.so.2", "elfType" : 3 }, { "b" : "2AAD07BB4000", "path" : "/usr/lib64/libstdc++.so.6", "elfType" : 3 }, { "b" : "2AAD07EB5000", "path" : "/lib64/libm.so.6", "elfType" : 3 }, { "b" : "2AAD08138000", "path" : "/lib64/libgcc_s.so.1", "elfType" : 3 }, { "b" : "2AAD08346000", "path" : "/lib64/libpthread.so.0", "elfType" : 3 }, { "b" : "2AAD08563000", "path" : "/lib64/libc.so.6", "elfType" : 3 }, { "b" : "2AAD07589000", "path" : "/lib64/ld-linux-x86-64.so.2", "elfType" : 3 } ] }}
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.063+0000 d20762|  mongod(_ZN5mongo15printStackTraceERSo+0x32) [0x1337a72]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.063+0000 d20762|  mongod(+0xF36979) [0x1336979]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.064+0000 d20762|  mongod(+0xF36CF8) [0x1336cf8]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.064+0000 d20762|  mongod(+0x10E9493) [0x14e9493]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.064+0000 d20762|  libpthread.so.0(+0xECA0) [0x2aad08354ca0]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.064+0000 d20762|  mongod(_ZN5mongo13ShardingState13forgetPendingEPNS_16OperationContextERKSsRKNS_7BSONObjES7_RKNS_3OIDEPSs+0xCB) [0xfc58bb]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.065+0000 d20762|  mongod(_ZN5mongo27MigrationDestinationManager14_migrateThreadESsNS_18MigrationSessionIdENS_7BSONObjES2_S2_SsNS_3OIDENS_19WriteConcernOptionsE+0x17C) [0xfa9edc]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.065+0000 d20762|  mongod(+0xBAA361) [0xfaa361]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.065+0000 d20762|  mongod(+0x194ED60) [0x1d4ed60]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.066+0000 d20762|  libpthread.so.0(+0x683D) [0x2aad0834c83d]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.066+0000 d20762|  libc.so.6(clone+0x6D) [0x2aad08637fdd]
      [js_test:zbigMapReduce] 2016-03-21T19:17:53.066+0000 d20762| -----  END BACKTRACE  -----
      

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            Assignee:
            kaloian.manassiev Kaloian Manassiev
            Reporter:
            kaloian.manassiev Kaloian Manassiev
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              Updated:
              Resolved: