[GitHub] [hadoop] hchaverri commented on a diff in pull request #5897: HDFS-17128. Updating SQLDelegationTokenSecretManager to use LoadingCache so tokens are updated frequently.

["hchaverri (via GitHub)" <gi...@apache.org>]

hchaverri commented on code in PR #5897:
URL: https://github.com/apache/hadoop/pull/5897#discussion_r1279644268


##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/DelegationTokenLoadingCache.java:
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@@ -0,0 +1,116 @@
+/**
+ * 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.hadoop.security.token.delegation;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import org.apache.hadoop.thirdparty.com.google.common.cache.CacheBuilder;
+import org.apache.hadoop.thirdparty.com.google.common.cache.CacheLoader;
+import org.apache.hadoop.thirdparty.com.google.common.cache.LoadingCache;
+
+
+/**
+ * Cache for delegation tokens that can handle high volume of tokens. A
+ * loading cache will prevent all active tokens from being in memory at the
+ * same time. It will also trigger more requests from the persistent token storage.
+ */
+public class DelegationTokenLoadingCache<K, V> implements Map<K, V> {
+  private LoadingCache<K, V> internalLoadingCache;
+
+  public DelegationTokenLoadingCache(long cacheExpirationMs, Function<K, V> singleEntryFunction) {
+    this.internalLoadingCache = CacheBuilder.newBuilder()
+        .expireAfterWrite(cacheExpirationMs, TimeUnit.MILLISECONDS)
+        .build(new CacheLoader<K, V>() {
+          @Override
+          public V load(K k) throws Exception {
+            return singleEntryFunction.apply(k);
+          }
+        });

Review Comment:
   We mainly need this to implement the Map functions so we don't have to update multiple SecretManger classes. Those classes currently expect to interact with the currentTokens Map and LoadingCaches don't provide all those methods.



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