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  1. Java Driver
  2. JAVA-403

UUIDs are stored as little endian (should be big endian)

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0.0
    • Component/s: Codecs, Configuration
    • Labels:
    • Environment:
      MacOS X 10.6 (which implies a little endian x86/64 CPU)
    • # Replies:
      22
    • Last comment by Customer:
      false
    • Story Points:
      1
    • Sprint:
      Java Sprint 7, Java Sprint 8, Java Sprint 9

      Description

      In python:
      >>> import pymongo
      >>> import uuid
      >>> from pymongo import Connection
      >>> c = Connection('localhost', 27017)
      >>> db = c.test
      >>> db.foo.insert(

      {"python": uuid.UUID("aaf4c61d-dcc5-e8a2-dabe-de0f3b482cd9")}

      )
      ObjectId('4e318fb98f1e81eac4000001')

      In java:
      UUID id = UUID.fromString("aaf4c61d-dcc5-e8a2-dabe-de0f3b482cd9");
      Mongo mongo = new Mongo();
      DB db = mongo.getDB("test");
      DBObject dbo = new BasicDBObject();
      dbo.put("java", id);
      db.getCollection("foo").insert(dbo);

      Result:
      > db.foo.find()

      { "_id" : ObjectId("4e318fb98f1e81eac4000001"), "python" : UUID('aaf4c61ddcc5e8a2dabede0f3b482cd9') } { "_id" : ObjectId("4e318fc12746ac3aa375aee9"), "java" : UUID('a2e8c5dc1dc6f4aad92c483b0fdebeda') }

      (yes, with the patch from SERVER-1201 applied)

      Java seems to serialize/deserialize the UUIDs as little endian according to BSONEncoder.java, line 354

      Changing this would however break a lot of applications out there. However, the python/java incompatibility is really bad, so it should be fixed in my humble opinion...

        Issue Links

          Activity

          Hide
          behackett Bernie Hackett added a comment -

          Philipp, you can already do this in PyMongo:

          http://api.mongodb.org/python/current/api/pymongo/collection.html#pymongo.collection.Collection.uuid_subtype

          Valid settings are OLD_UUID_SUBTYPE (3 - the current default), UUID_SUBTYPE (4 - will be the default in some future release), JAVA_LEGACY, and CSHARP_LEGACY.

          This is a per-collection setting so that you can use subtype 4 in new collections but use legacy byte orders in existing collections.

          Show
          behackett Bernie Hackett added a comment - Philipp, you can already do this in PyMongo: http://api.mongodb.org/python/current/api/pymongo/collection.html#pymongo.collection.Collection.uuid_subtype Valid settings are OLD_UUID_SUBTYPE (3 - the current default), UUID_SUBTYPE (4 - will be the default in some future release), JAVA_LEGACY, and CSHARP_LEGACY. This is a per-collection setting so that you can use subtype 4 in new collections but use legacy byte orders in existing collections.
          Hide
          jeff.yemin Jeff Yemin added a comment -

          Moving to 3.0 release, unfortunately. The only way to do this in 2.x is with the DBEncoder/DBDecoder framework, and we're likely going to be getting rid of that framework in 3.0.

          Show
          jeff.yemin Jeff Yemin added a comment - Moving to 3.0 release, unfortunately. The only way to do this in 2.x is with the DBEncoder/DBDecoder framework, and we're likely going to be getting rid of that framework in 3.0.
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'guoyr', u'name': u'Robert Guo', u'email': u'robert.guo@10gen.com'}

          Message: JAVA-403 allow user to specify UUID format
          Branch: 3.0.x
          https://github.com/mongodb/mongo-java-driver/commit/3d44a7e300f5359690d1b5870c7509f3617552f2

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'guoyr', u'name': u'Robert Guo', u'email': u'robert.guo@10gen.com'} Message: JAVA-403 allow user to specify UUID format Branch: 3.0.x https://github.com/mongodb/mongo-java-driver/commit/3d44a7e300f5359690d1b5870c7509f3617552f2
          Hide
          xgen-internal-githook Githook User added a comment -

          Author:

          {u'username': u'guoyr', u'name': u'Robert Guo', u'email': u'robert.guo@10gen.com'}

          Message: JAVA-403 allow user to specify UUID format
          Branch: master
          https://github.com/mongodb/mongo-java-driver/commit/3d44a7e300f5359690d1b5870c7509f3617552f2

          Show
          xgen-internal-githook Githook User added a comment - Author: {u'username': u'guoyr', u'name': u'Robert Guo', u'email': u'robert.guo@10gen.com'} Message: JAVA-403 allow user to specify UUID format Branch: master https://github.com/mongodb/mongo-java-driver/commit/3d44a7e300f5359690d1b5870c7509f3617552f2
          Hide
          jeff.yemin Jeff Yemin added a comment -

          Closing all resolved 3.0.0 issues, as 3.0.0 has been tagged and released.

          Show
          jeff.yemin Jeff Yemin added a comment - Closing all resolved 3.0.0 issues, as 3.0.0 has been tagged and released.

            People

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              7 Vote for this issue
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              14 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:
                Days since reply:
                3 weeks, 4 days ago
                Date of 1st Reply:

                Agile