abstractdog commented on code in PR #7827:
URL: https://github.com/apache/hadoop/pull/7827#discussion_r2230784229


##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/SecretManagerConfig.java:
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@@ -0,0 +1,143 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.security.token;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.Mac;
+import java.security.NoSuchAlgorithmException;
+import java.util.Map;
+import java.util.WeakHashMap;
+
+/**
+ * Provides configuration and utility methods for managing cryptographic key 
generation
+ * and message authentication code (MAC) generation using specified algorithms 
and key lengths.
+ * <p>
+ * This class supports static access to the selected cryptographic algorithm 
and key length,
+ * and provides methods to create configured {@link javax.crypto.KeyGenerator}
+ * and {@link javax.crypto.Mac} instances.
+ * The configuration is initialized statically from a provided {@link 
Configuration} object.
+ * <p>
+ * The {@link SecretManager} has some static method, so static configuration 
is required
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public final class SecretManagerConfig {
+  private static final Logger LOG = 
LoggerFactory.getLogger(SecretManagerConfig.class);
+  private static String selectedAlgorithm;
+  private static int selectedLength;
+
+  private static final Map<Thread, KeyGenerator> KEYGENS = new WeakHashMap<>();
+  public static final Map<Thread, Mac> MACS = new WeakHashMap<>();
+
+  static {
+    update(new Configuration());
+  }
+
+  private SecretManagerConfig() {
+  }
+
+  /**
+   * Updates the selected cryptographic algorithm and key length using the 
provided
+   * Hadoop {@link Configuration}. This method reads the values for
+   * {@code HADOOP_SECURITY_SECRET_MANAGER_KEY_GENERATOR_ALGORITHM_KEY} and
+   * {@code HADOOP_SECURITY_SECRET_MANAGER_KEY_LENGTH_KEY}, or uses default 
values if not set.
+   *
+   * @param conf the configuration object containing cryptographic settings
+   */
+  public static synchronized void update(Configuration conf) {
+    if (!KEYGENS.isEmpty()) {
+      LOG.warn("Keygen was already initialized with older config, those will 
not be updated." +
+          "Hint: If you turn on debug log you can see when it happened. 
Keygens: {}", KEYGENS);
+    }
+    if (!MACS.isEmpty()) {
+      LOG.warn("Mac was already initialized with older config, those will not 
be updated." +

Review Comment:
   I don't think we need to store and log all the macs, I would be satisfied 
with logging if there is any in the current thread, acquired by:
   ```
   threadLocalMac.get()
   ```
   assuming that the update() happens on the same thread as the usage, this can 
be a useful logging message (without logging a whole MACS collection)



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