Core Server
  1. Core Server
  2. SERVER-1512

backup objects deleted by rollback (WAS: Repl set: Behavior when resyncing -> deleting documents)

      Details

      • Type: Improvement Improvement
      • Status: Closed Closed
      • Priority: Major - P3 Major - P3
      • Resolution: Fixed
      • Affects Version/s: 1.5.6
      • Fix Version/s: 1.5.8
      • Component/s: Replication/Pairing
      • Labels:
        None
      • Backport:
        No
      • # Replies:
        3
      • Last comment by Customer:
        true

        Description

        Just looking through docs + code:

        F = node that failed and coming back.
        P = node that took over, new primary
        From documentation and code in rs_rollback.cpp, appears we are deleting (or overwrite) data from 'F' that was when it comes back online after being down

        In addition to deleting/updating, should we be copy the deleted versions of documents somewhere (e.g. some temp collection)
        so that a manual re-application of the data is possible, if necessary?

        (sorry if this behavior is already there and I missed it)

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          Author:

          {'login': 'erh', 'name': 'Eliot Horowitz', 'email': 'eliot@10gen.com'}

          Message: store rolled back info in flat files SERVER-1512
          http://github.com/mongodb/mongo/commit/7207fe34dcb37bf0e284fa3d451ae6e858659b16

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          auto           added a comment - Author: {'login': 'erh', 'name': 'Eliot Horowitz', 'email': 'eliot@10gen.com'} Message: store rolled back info in flat files SERVER-1512 http://github.com/mongodb/mongo/commit/7207fe34dcb37bf0e284fa3d451ae6e858659b16
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          Author:

          {'login': 'erh', 'name': 'Eliot Horowitz', 'email': 'eliot@10gen.com'}

          Message: fix rollback saving SERVER-1512
          http://github.com/mongodb/mongo/commit/625115721c13c93c2b17bab9bc0d686322fa9546

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          auto           added a comment - Author: {'login': 'erh', 'name': 'Eliot Horowitz', 'email': 'eliot@10gen.com'} Message: fix rollback saving SERVER-1512 http://github.com/mongodb/mongo/commit/625115721c13c93c2b17bab9bc0d686322fa9546
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          Michael Dirolf           added a comment -

          Giving a bit more details on what happens here, since we're linking to this case to explain (Eliot please correct if I'm wrong):

          When a document needs to be rolled back it first gets written/appended to a flat file in the data directory, in a subdirectory called "rollback". The document gets written to a file named <current_ns>.<current_time>.<ordinal>.bson, and is written as a raw BSON document. The file should be treated as a sequence of raw BSON documents, much like the files generated by mongodump.

          Show
          Michael Dirolf           added a comment - Giving a bit more details on what happens here, since we're linking to this case to explain (Eliot please correct if I'm wrong): When a document needs to be rolled back it first gets written/appended to a flat file in the data directory, in a subdirectory called "rollback". The document gets written to a file named <current_ns>.<current_time>.<ordinal>.bson, and is written as a raw BSON document. The file should be treated as a sequence of raw BSON documents, much like the files generated by mongodump.

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              Dates

              • Created:
                Updated:
                Resolved:
                Days since reply:
                3 years, 36 weeks, 1 day ago
                Date of 1st Reply: