diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/MPPQueryContext.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/MPPQueryContext.java
index 9d865e0a624e..26dd1f6a0978 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/MPPQueryContext.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/common/MPPQueryContext.java
@@ -85,7 +85,7 @@ public MPPQueryContext(QueryId queryId) {
     this.queryId = queryId;
     this.endPointBlackList = new LinkedList<>();
     this.memoryReservationContext =
-        new UnsynchronizedMemoryReservationContext(queryId, "MPPQueryContext");
+        new UnsynchronizedMemoryReservationContext(queryId, this.getClass().getName());
   }
 
   // TODO too many callers just pass a null SessionInfo which should be forbidden
@@ -318,7 +318,7 @@ public void releaseAllMemoryReservedForFrontEnd() {
     this.memoryReservationContext.releaseAllReservedMemory();
   }
 
-  public void releaseAllMemoryReservedForFrontEnd(final long bytes) {
+  public void releaseMemoryReservedForFrontEnd(final long bytes) {
     this.memoryReservationContext.releaseMemoryAccumulatively(bytes);
   }
 
diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/fragment/FragmentInstanceContext.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/fragment/FragmentInstanceContext.java
index 152daa8bd422..a9d92cc2b80c 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/fragment/FragmentInstanceContext.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/fragment/FragmentInstanceContext.java
@@ -29,7 +29,7 @@
 import org.apache.iotdb.db.queryengine.metric.QueryRelatedResourceMetricSet;
 import org.apache.iotdb.db.queryengine.metric.SeriesScanCostMetricSet;
 import org.apache.iotdb.db.queryengine.plan.planner.memory.MemoryReservationContext;
-import org.apache.iotdb.db.queryengine.plan.planner.memory.UnsynchronizedMemoryReservationContext;
+import org.apache.iotdb.db.queryengine.plan.planner.memory.SynchronizedMemoryReservationContext;
 import org.apache.iotdb.db.queryengine.plan.planner.plan.TimePredicate;
 import org.apache.iotdb.db.storageengine.dataregion.IDataRegionForQuery;
 import org.apache.iotdb.db.storageengine.dataregion.read.IQueryDataSource;
@@ -198,7 +198,7 @@ private FragmentInstanceContext(
     this.dataNodeQueryContextMap = dataNodeQueryContextMap;
     this.dataNodeQueryContext = dataNodeQueryContextMap.get(id.getQueryId());
     this.memoryReservationContext =
-        new UnsynchronizedMemoryReservationContext(id.getQueryId(), "FragmentInstanceContext");
+        new SynchronizedMemoryReservationContext(id.getQueryId(), this.getClass().getName());
   }
 
   private FragmentInstanceContext(
@@ -210,7 +210,7 @@ private FragmentInstanceContext(
     this.dataNodeQueryContextMap = null;
     this.dataNodeQueryContext = null;
     this.memoryReservationContext =
-        new UnsynchronizedMemoryReservationContext(id.getQueryId(), "FragmentInstanceContext");
+        new SynchronizedMemoryReservationContext(id.getQueryId(), this.getClass().getName());
   }
 
   private FragmentInstanceContext(
@@ -227,7 +227,7 @@ private FragmentInstanceContext(
     this.globalTimeFilter = globalTimeFilter;
     this.dataNodeQueryContextMap = null;
     this.memoryReservationContext =
-        new UnsynchronizedMemoryReservationContext(id.getQueryId(), "FragmentInstanceContext");
+        new SynchronizedMemoryReservationContext(id.getQueryId(), this.getClass().getName());
   }
 
   @TestOnly
diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/optimization/AggregationPushDown.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/optimization/AggregationPushDown.java
index 3e71b5822876..a8b01ef6a84d 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/optimization/AggregationPushDown.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/optimization/AggregationPushDown.java
@@ -676,7 +676,7 @@ public Set<Expression> getAggregationExpressions() {
     }
 
     public void releaseMemoryForFrontEnd(final long bytes) {
-      this.context.releaseAllMemoryReservedForFrontEnd(bytes);
+      this.context.releaseMemoryReservedForFrontEnd(bytes);
     }
   }
 }
diff --git a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/UnsynchronizedMemoryReservationContext.java b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/UnsynchronizedMemoryReservationContext.java
index 4a67bb13f542..aedae268ddac 100644
--- a/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/UnsynchronizedMemoryReservationContext.java
+++ b/iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/memory/UnsynchronizedMemoryReservationContext.java
@@ -46,8 +46,8 @@ public UnsynchronizedMemoryReservationContext(final QueryId queryId, final Strin
 
   @Override
   public void reserveMemoryAccumulatively(final long size) {
-    this.bytesToBeReserved += size;
-    if (this.bytesToBeReserved >= MEMORY_BATCH_THRESHOLD) {
+    bytesToBeReserved += size;
+    if (bytesToBeReserved >= MEMORY_BATCH_THRESHOLD) {
       reserveMemoryImmediately();
     }
   }
@@ -57,25 +57,25 @@ public void reserveMemoryImmediately() {
     if (bytesToBeReserved != 0) {
       LOCAL_EXECUTION_PLANNER.reserveFromFreeMemoryForOperators(
           bytesToBeReserved, reservedBytesInTotal, queryId.getId(), contextHolder);
-      this.reservedBytesInTotal += bytesToBeReserved;
-      this.bytesToBeReserved = 0;
+      reservedBytesInTotal += bytesToBeReserved;
+      bytesToBeReserved = 0;
     }
   }
 
   @Override
   public void releaseMemoryAccumulatively(final long size) {
-    this.bytesToBeReleased += size;
+    bytesToBeReleased += size;
     if (bytesToBeReleased >= MEMORY_BATCH_THRESHOLD) {
       long bytesToRelease;
-      if (this.bytesToBeReleased <= bytesToBeReserved) {
-        bytesToBeReserved -= this.bytesToBeReleased;
+      if (bytesToBeReleased <= bytesToBeReserved) {
+        bytesToBeReserved -= bytesToBeReleased;
       } else {
-        bytesToRelease = this.bytesToBeReleased - bytesToBeReserved;
+        bytesToRelease = bytesToBeReleased - bytesToBeReserved;
         bytesToBeReserved = 0;
         LOCAL_EXECUTION_PLANNER.releaseToFreeMemoryForOperators(bytesToRelease);
         reservedBytesInTotal -= bytesToRelease;
       }
-      this.bytesToBeReleased = 0;
+      bytesToBeReleased = 0;
     }
   }