xunliu commented on code in PR #8297:
URL: https://github.com/apache/gravitino/pull/8297#discussion_r2317554687


##########
core/src/main/java/org/apache/gravitino/cache/ReverseIndexRules.java:
##########
@@ -0,0 +1,113 @@
+/*
+ * 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.gravitino.cache;
+
+import org.apache.gravitino.Entity;
+import org.apache.gravitino.NameIdentifier;
+import org.apache.gravitino.Namespace;
+import org.apache.gravitino.meta.GroupEntity;
+import org.apache.gravitino.meta.RoleEntity;
+import org.apache.gravitino.meta.UserEntity;
+import org.apache.gravitino.utils.NamespaceUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Reverse index rules for different entity types. This class defines how to 
process reverse
+ * indexing for UserEntity, GroupEntity, and RoleEntity. <br>
+ * For example: <br>
+ * - UserEntity role is 
{metalake-name}.system.user.{user-name}:USER-{serial-number} <br>
+ * - GroupEntity role is 
{metalake-name}.system.group.{group-name}:GROUP-{serial-number} <br>
+ * - RoleEntity role is 
{metalake-name}.system.role.{role-name}:ROLE-{serial-number} <br>
+ */
+public class ReverseIndexRules {
+  private static final Logger LOG = 
LoggerFactory.getLogger(ReverseIndexRules.class.getName());

Review Comment:
   fixed



##########
core/src/main/java/org/apache/gravitino/cache/CaffeineEntityCache.java:
##########
@@ -331,18 +346,62 @@ private <KEY, VALUE> Caffeine<KEY, VALUE> 
newBaseBuilder(Config cacheConfig) {
   }
 
   /**
-   * Invalidates the entities by the given cache key.
+   * Invalidate entities with iterative BFS algorithm.
    *
    * @param identifier The identifier of the entity to invalidate
    */
-  private boolean invalidateEntities(NameIdentifier identifier) {
-    List<EntityCacheKey> entityKeysToRemove =
-        
Lists.newArrayList(cacheIndex.getValuesForKeysStartingWith(identifier.toString()));
+  private boolean invalidateEntities(
+      NameIdentifier identifier,
+      Entity.EntityType type,
+      Optional<SupportsRelationOperations.Type> relTypeOpt) {
+    Queue<EntityCacheKey> queue = new ArrayDeque<>();
+
+    EntityCacheKey valueForExactKey =
+        cacheIndex.getValueForExactKey(
+            relTypeOpt.isEmpty()
+                ? EntityCacheKey.of(identifier, type).toString()
+                : EntityCacheRelationKey.of(identifier, type, 
relTypeOpt.get()).toString());
+
+    if (valueForExactKey == null) {
+      // No key to remove
+      return false;
+    }
 
-    cacheData.invalidateAll(entityKeysToRemove);
-    entityKeysToRemove.forEach(key -> cacheIndex.remove(key.toString()));
+    queue.offer(valueForExactKey);
+
+    while (!queue.isEmpty()) {
+      EntityCacheKey currentKeyToRemove = queue.poll();
+
+      cacheData.invalidate(currentKeyToRemove);
+      cacheIndex.remove(currentKeyToRemove.toString());
+
+      // Remove related entity keys
+      List<EntityCacheKey> relatedEntityKeysToRemove =
+          Lists.newArrayList(
+              
cacheIndex.getValuesForKeysStartingWith(currentKeyToRemove.identifier().toString()));
+      queue.addAll(relatedEntityKeysToRemove);
+
+      // Look up from reverse index to go to next depth
+      List<EntityCacheKey> reverseKeysToRemove =
+          Lists.newArrayList(
+              reverseIndex.getValuesForKeysStartingWith(
+                  currentKeyToRemove.identifier().toString()));
+      reverseKeysToRemove.forEach(
+          key -> {
+            // Remove from reverse index
+            // Convert EntityCacheRelationKey to EntityCacheKey
+            reverseIndex
+                .getKeysStartingWith(key.toString())
+                .forEach(
+                    reverseIndexKey -> {
+                      reverseIndex.remove(reverseIndexKey.toString());
+                    });
+          });
+
+      reverseKeysToRemove.forEach(queue::offer);

Review Comment:
   fixed



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