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  1. Core Server
  2. SERVER-1512

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

        Details

        • Type: Improvement
        • Status: Closed
        • Priority: Major - P3
        • Resolution: Fixed
        • Affects Version/s: 1.5.6
        • Fix Version/s: 1.5.8
        • Component/s: Replication
        • Labels:
          None

          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)

            Activity

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            auto auto (Inactive) 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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            auto auto (Inactive) 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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            auto auto (Inactive) 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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            auto auto (Inactive) 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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            mike 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
            mike 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: