Fix deserialization of maxBytesInMemory (#9092)

* Fix deserialization of maxBytesInMemory

* Add maxBytes check

indexing-service/src/main/java/org/apache/druid/indexing/common/index/RealtimeAppenderatorTuningConfig.java

@@ -143,6 +143,7 @@ public class RealtimeAppenderatorTuningConfig implements TuningConfig, Appendera
   }
 
   @Override
+  @JsonProperty
   public long getMaxBytesInMemory()
   {
     return maxBytesInMemory;

indexing-service/src/test/java/org/apache/druid/indexing/common/task/TaskSerdeTest.java

@@ -394,7 +394,7 @@ public class TaskSerdeTest
 
             new RealtimeTuningConfig(
                 1,
-                null,
+                10L,
                 new Period("PT10M"),
                 null,
                 null,
@@ -445,6 +445,10 @@ public class TaskSerdeTest
         task.getRealtimeIngestionSchema().getTuningConfig().getWindowPeriod(),
         task2.getRealtimeIngestionSchema().getTuningConfig().getWindowPeriod()
     );
+    Assert.assertEquals(
+        task.getRealtimeIngestionSchema().getTuningConfig().getMaxBytesInMemory(),
+        task2.getRealtimeIngestionSchema().getTuningConfig().getMaxBytesInMemory()
+    );
     Assert.assertEquals(
         task.getRealtimeIngestionSchema().getDataSchema().getGranularitySpec().getSegmentGranularity(),
         task2.getRealtimeIngestionSchema().getDataSchema().getGranularitySpec().getSegmentGranularity()

server/src/main/java/org/apache/druid/segment/indexing/RealtimeTuningConfig.java

@@ -174,6 +174,7 @@ public class RealtimeTuningConfig implements TuningConfig, AppenderatorConfig
   }
 
   @Override
+  @JsonProperty
   public long getMaxBytesInMemory()
   {
     return maxBytesInMemory;