Replace command problems on a sharded database. We've previously had problems where the Replace command would fail, saying Shard Key doesn't match. Now we have cases where a call to the Replace command will create a new record instead of updating the current record. This might be a problem with the parameters we are passing.

Here's a code snippet (It uses externally defined items, so it won't run as is, but does show the options for the calls we are using).

public static MongoCollection<ContentItem> GetCollection(MongoServer oServer, IdentifierItem oItem)

{ return oServer .GetDatabase(new MongoDatabaseSettings("customer" + oItem.CustomerID.ToString(), null, GuidRepresentation.Standard, new SafeMode(true), true)) .GetCollection<ContentItem>("namespace" + oItem.NamespaceID.ToString()); }

var oServer = MongoServer.Create(m_sUri);

var oCollection = MongoDbFactory.GetCollection(oServer, oItem);

var oQuery = Query.And(Query.EQ("ContentID", oItem.ContentID.ToString()), Query.EQ("ShardID", oItem.ShardID.ToString()));
oCollection.Update(oQuery,

MongoDB.Driver.Builders.Update.Replace(oItem),

UpdateFlags.Upsert,

SafeMode.True);