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  1. Core Server
  2. SERVER-23960

Improve log message on 3.2 when downgrading from 3.3+ after creating new WT index



    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.2.7, 3.3.8
    • Component/s: Indexing, Storage
    • Labels:
    • Backwards Compatibility:
      Fully Compatible
    • Backport Completed:
    • Sprint:
      Integrate+Tuning 15 (06/03/16)


      The error message that is emitted when a user downgrades after creating an index in version 3.3.5+ is unhelpful.

      We can change the log message to give the user more information about how to handle the downgrade in 3.2.7+ and what the offending collection/index is.

      dan:(git)mongo[master]/$ ../3.2-mongo/mongod
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] MongoDB starting : pid=28134 port=27017 dbpath=/data/db 64-bit host=dan
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] db version v3.2.5-33-g111b51d
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] git version: 111b51db9db315b6ed0fcfc8f444c75c85f54dc6
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] allocator: tcmalloc
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] modules: none
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] build environment:
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten]     distarch: x86_64
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten]     target_arch: x86_64
      2016-04-27T12:48:18.658-0400 I CONTROL  [initandlisten] options: {}
      2016-04-27T12:48:18.675-0400 I -        [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
      2016-04-27T12:48:18.675-0400 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=74G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
      2016-04-27T12:48:18.877-0400 I CONTROL  [initandlisten]
      ==> 2016-04-27T12:48:18.879-0400 I -        [initandlisten] Fatal assertion 28579 UnsupportedFormat: Application metadata for table:index-0-1896016118062454958 has unsupported format version 7
      2016-04-27T12:48:18.879-0400 I -        [initandlisten]
      ***aborting after fassert() failure


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