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  1. Core Server
  2. SERVER-54956

Move away from using Bson_serialization_type “any” - CommitQuorum

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Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 5.0.0-rc0
    • Index Maintenance
    • None
    • Fully Compatible
    • Execution Team 2021-04-19

    Description

      Using Bson_serialization_type “any” means that idl compatibility checker script can’t do any type checking, since that logic is in cpp, so we want to disallow this type from parameters/reply fields as a result.

      However, lots of commands actually use it for valid reasons.
      For now we added some exceptions to allow using Bson_serialization_type “any” in our idl_checker script, these are the lisf of fields that still using Bson_serialization_type “any” that require your attention:

      src/mongo/db/create_indexes.idl

      1. The 'createIndexes'' command has parameter 'commitQuorum' that has type
      2. 'CommitQuorum' 'createIndexes' has a reply field 'commitQuorum' of type 'CommitQuorum'  

       
      Take a look at these fields and try to identify which ones can be converted away from using Bson_serialization_type “any”, and which ones must keep using it.
      Here are the two outcomes:
      1- if the field can be converted:

      • This change should be done before 5.0 (if the field is "stable") as this will be the realese for API stable Version 1
      • The exception for that field should be removed from idl_checker script (TODO will be added with this ticket number).

      2- if the field can't be converted, or the change can't be done before 5.0.

      • The type of that field type should stay of Bson_serialization_type “any” and can't be changed later for any reason unless it is defined as "unstable".
      • We need to put comments on the serialization/deserialization to prevent the behavioral changes (preferably to add tests to ensure that.)

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              benety.goh@mongodb.com Benety Goh
              m.maher@mongodb.com Moustafa Maher
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