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  1. C# Driver
  2. CSHARP-388

Duplicate element name 'cause' when map reducing

    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 1.4
    • Affects Version/s: 1.3.1
    • Component/s: None
    • Environment:
      windows

      When mapreducing, a strange error appear sometimes. Here is the stacktrace :
      System.InvalidOperationException: Duplicate element name 'cause'. at MongoDB.Bson.BsonDocument.Add(BsonElement element) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 453
      at MongoDB.Bson.BsonDocument.Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 720
      at MongoDB.Bson.BsonDocument.ReadFrom(BsonReader bsonReader) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 393
      at MongoDB.Bson.Serialization.BsonSerializer.Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\Serialization\BsonSerializer.cs:line 214
      at MongoDB.Driver.Internal.MongoReplyMessage`1.ReadFrom(BsonBuffer buffer, IBsonSerializationOptions serializationOptions) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Internal\MongoReplyMessage.cs:line 94
      at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializationOptions serializationOptions) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Internal\MongoConnection.cs:line 386
      at MongoDB.Driver.MongoCursorEnumerator`1.GetReply(MongoConnection connection, MongoRequestMessage message) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 263
      at MongoDB.Driver.MongoCursorEnumerator`1.GetFirst() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 223
      at MongoDB.Driver.MongoCursorEnumerator`1.MoveNext() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 126
      at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at MongoDB.Driver.MongoCollection.FindOneAs[TDocument](IMongoQuery query) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 498 at MongoDB.Driver.MongoCollection`1.FindOne(IMongoQuery query) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 1639 at MongoDB.Driver.MongoDatabase.RunCommandAs(Type commandResultType, IMongoCommand command) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoDatabase.cs:line 891
      at MongoDB.Driver.MongoDatabase.RunCommandAs[TCommandResult](IMongoCommand command) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoDatabase.cs:line 866
      at MongoDB.Driver.MongoCollection.MapReduce(BsonJavaScript map, BsonJavaScript reduce, IMongoMapReduceOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 1106 at MongoDB.Driver.MongoCollection.MapReduce(IMongoQuery query, BsonJavaScript map, BsonJavaScript reduce, IMongoMapReduceOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 1127

      I think this due to the driver incapicity to add several times the same field to a bsondocument.

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            kamaradclimber Grégoire Seux
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              Created:
              Updated:
              Resolved: