Remove persistence default serializer feature

Author: Arkatufus

src/contrib/persistence/Akka.Persistence.Sql.Common/Journal/QueryExecutor.cs

@@ -181,7 +181,8 @@ public class QueryConfiguration
         /// <summary>
         /// The default serializer used when not type override matching is found
         /// </summary>
-        public string DefaultSerializer { get; }
+        [Obsolete(message: "This property will always return null")]
+        public string DefaultSerializer => null;
 
         /// <summary>
         /// Uses the CommandBehavior.SequentialAccess when creating the command, providing a performance improvement for reading large BLOBS.
@@ -220,7 +221,7 @@ public QueryConfiguration(
             string orderingColumnName,
             string serializerIdColumnName,
             TimeSpan timeout,
-            string defaultSerializer,
+            string defaultSerializer, // This is being ignored now
             bool useSequentialAccess)
         {
             SchemaName = schemaName;
@@ -235,7 +236,6 @@ public QueryConfiguration(
             Timeout = timeout;
             TagsColumnName = tagsColumnName;
             OrderingColumnName = orderingColumnName;
-            DefaultSerializer = defaultSerializer;
             SerializerIdColumnName = serializerIdColumnName;
             UseSequentialAccess = useSequentialAccess;
         }
@@ -780,7 +780,7 @@ protected DbCommand GetCommand(DbConnection connection, string sql)
         protected virtual void WriteEvent(DbCommand command, IPersistentRepresentation e, IImmutableSet<string> tags)
         {
 
-            var serializer = Serialization.FindSerializerForType(e.Payload.GetType(), Configuration.DefaultSerializer);
+            var serializer = Serialization.FindSerializerForType(e.Payload.GetType());
 
             // TODO: hack. Replace when https://github.com/akkadotnet/akka.net/issues/3811
             var (binary,manifest) = Akka.Serialization.Serialization.WithTransport(Serialization.System,(e.Payload,serializer) ,(state) =>
@@ -846,7 +846,7 @@ protected virtual IPersistentRepresentation ReadEvent(DbDataReader reader)
             {
                 // Support old writes that did not set the serializer id
                 var type = Type.GetType(manifest, true);
-                var deserializer = Serialization.FindSerializerForType(type, Configuration.DefaultSerializer);
+                var deserializer = Serialization.FindSerializerForType(type);
                 // TODO: hack. Replace when https://github.com/akkadotnet/akka.net/issues/3811
                 deserialized = Akka.Serialization.Serialization.WithTransport(
                     Serialization.System, (deserializer, (byte[])payload, type),

src/core/Akka.API.Tests/CoreAPISpec.ApprovePersistenceSqlCommon.verified.txt

@@ -221,6 +221,7 @@ namespace Akka.Persistence.Sql.Common.Journal
         public readonly System.TimeSpan Timeout;
         public readonly string TimestampColumnName;
         public QueryConfiguration(string schemaName, string journalEventsTableName, string metaTableName, string persistenceIdColumnName, string sequenceNrColumnName, string payloadColumnName, string manifestColumnName, string timestampColumnName, string isDeletedColumnName, string tagsColumnName, string orderingColumnName, string serializerIdColumnName, System.TimeSpan timeout, string defaultSerializer, bool useSequentialAccess) { }
+        [System.ObsoleteAttribute("This property will always return null")]
         public string DefaultSerializer { get; }
         public string FullJournalTableName { get; }
         public string FullMetaTableName { get; }

src/core/Akka.Persistence/persistence.conf

@@ -115,9 +115,6 @@ akka.persistence {
         # Dispatcher for message replay.
         replay-dispatcher = "akka.persistence.dispatchers.default-replay-dispatcher"
 
-        # Default serializer used as manifest serializer when applicable and payload serializer when no specific binding overrides are specified
-        serializer = "json"
-
         # Removed: used to be the Maximum size of a persistent message batch written to the journal.
         # Now this setting is without function, PersistentActor will write as many messages
         # as it has accumulated since the last write.
@@ -174,9 +171,6 @@ akka.persistence {
         # Dispatcher for the plugin actor.
         plugin-dispatcher = "akka.persistence.dispatchers.default-plugin-dispatcher"
 
-        # Default serializer used as manifest serializer when applicable and payload serializer when no specific binding overrides are specified
-        serializer = "json"
-
         circuit-breaker {
             max-failures = 5
             call-timeout = 20s