ptupitsyn commented on a change in pull request #9612:
URL: https://github.com/apache/ignite/pull/9612#discussion_r763062896



##########
File path: 
modules/core/src/main/java/org/apache/ignite/configuration/SystemDataRegionConfiguration.java
##########
@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.ignite.configuration;
+
+import java.io.Serializable;
+import org.apache.ignite.internal.util.typedef.internal.A;
+
+/**
+ * This class allows defining system data region configuration with various 
parameters for Apache Ignite
+ * page memory (see {@link DataStorageConfiguration}.
+ * This class is similiar to {@link DataRegionConfiguration}, but with 
restricted set of properties.
+ */
+public class SystemDataRegionConfiguration implements Serializable {
+    /** Serial version uid. */
+    private static final long serialVersionUID = 0L;
+
+    /** Default initial size of a memory chunk for the system cache (40 MB). */
+    private static final long DFLT_SYS_REG_INIT_SIZE = 40L * 1024 * 1024;

Review comment:
       I think those constants should be public (for example, see default 
values in `IgniteConfiguration` class).

##########
File path: 
modules/platforms/dotnet/Apache.Ignite.Core/Configuration/DataStorageConfiguration.cs
##########
@@ -478,13 +491,37 @@ internal void Write(IBinaryRawWriter writer)
         /// Gets or sets the size of a memory chunk reserved for system needs.
         /// </summary>
         [DefaultValue(DefaultSystemRegionInitialSize)]
-        public long SystemRegionInitialSize { get; set; }

Review comment:
       We should totally use `[Obsolete]` attribute for deprecated APIs. 
   
   Yes, we would have to suppress compiler warnings when using those APIs - 
that's the whole point of the attribute, to get a warning.




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