CSHARP-2365: Deprecate parallelCollectionScan helpers

Author: ksadoff

README.md

@@ -83,6 +83,7 @@ Please see our [guidelines](CONTRIBUTING.md) for contributing to the driver.
 ### Maintainers:
 * Vincent Kam               [email protected]
 * Dmitry Lukyanov           [email protected]
+* Katie Sadoff              [email protected]
 * Robert Stam               [email protected]
 * Craig Wilson              [email protected]
 

src/MongoDB.Driver.Core/Core/Operations/ParallelScanOperation.cs

@@ -52,6 +52,7 @@ public class ParallelScanOperation<TDocument> : IReadOperation<IReadOnlyList<IAs
         /// <param name="numberOfCursors">The number of cursors.</param>
         /// <param name="serializer">The serializer.</param>
         /// <param name="messageEncoderSettings">The message encoder settings.</param>
+        [Obsolete("ParallelScanOperation was deprecated in server version 4.1.")]
         public ParallelScanOperation(
             CollectionNamespace collectionNamespace,
             int numberOfCursors,

src/MongoDB.Driver.Legacy/MongoCollection.cs

@@ -1702,11 +1702,13 @@ private MapReduceResult MapReduce(IClientSessionHandle session, MapReduceArgs ar
         /// <typeparam name="TDocument">The type of the document.</typeparam>
         /// <param name="args">The args.</param>
         /// <returns>Multiple enumerators, one for each cursor.</returns>
+        [Obsolete("ParallelScanAs was deprecated in server version 4.1.")]
         public ReadOnlyCollection<IEnumerator<TDocument>> ParallelScanAs<TDocument>(ParallelScanArgs<TDocument> args)
         {
             return UsingImplicitSession(session => ParallelScanAs(session, args));
         }
 
+        [Obsolete("ParallelScanAs was deprecated in server version 4.1.")]
         private ReadOnlyCollection<IEnumerator<TDocument>> ParallelScanAs<TDocument>(IClientSessionHandle session, ParallelScanArgs<TDocument> args)
         {
             var batchSize = args.BatchSize;
@@ -1730,6 +1732,7 @@ private ReadOnlyCollection<IEnumerator<TDocument>> ParallelScanAs<TDocument>(ICl
         /// <param name="documentType">Type of the document.</param>
         /// <param name="args">The args.</param>
         /// <returns>Multiple enumerators, one for each cursor.</returns>
+        [Obsolete("ParallelScanAs was deprecated in server version 4.1.")]
         public ReadOnlyCollection<IEnumerator> ParallelScanAs(Type documentType, ParallelScanArgs args)
         {
             var parallelScanArgsDefinition = typeof(ParallelScanArgs<>);
@@ -2219,7 +2222,7 @@ private MongoCursor FindAs(Type documentType, IMongoQuery query, IBsonSerializer
 #pragma warning disable 618
             return MongoCursor.Create(documentType, this, query, _settings.ReadConcern, _settings.ReadPreference, serializer);
 #pragma warning restore
-        
+
         }
 
         private MongoCursor<TDocument> FindAs<TDocument>(IMongoQuery query, IBsonSerializer serializer)
@@ -2482,6 +2485,7 @@ public virtual IEnumerable<WriteConcernResult> InsertBatch(
         /// </summary>
         /// <param name="args">The args.</param>
         /// <returns>Multiple enumerators, one for each cursor.</returns>
+        [Obsolete("ParallelScan was deprecated in server version 4.1.")]
         public virtual ReadOnlyCollection<IEnumerator<TDefaultDocument>> ParallelScan(ParallelScanArgs<TDefaultDocument> args)
         {
             return ParallelScanAs<TDefaultDocument>(args);

tests/MongoDB.Driver.Legacy.Tests/MongoCollectionTests.cs

@@ -2949,11 +2949,13 @@ public void TestParallelScan()
                     _collection.Insert(new BsonDocument("_id", i));
                 }
 
+#pragma warning disable 618
                 var enumerators = _collection.ParallelScanAs(typeof(BsonDocument), new ParallelScanArgs
                 {
                     BatchSize = 100,
                     NumberOfCursors = numberOfCursors
                 });
+#pragma warning restore
                 Assert.True(enumerators.Count >= 1);
 
                 var ids = new List<int>();