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https://issues.apache.org/jira/browse/YARN-11471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843617#comment-17843617
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ASF GitHub Bot commented on YARN-11471:
---------------------------------------
slfan1989 commented on code in PR #6795:
URL: https://github.com/apache/hadoop/pull/6795#discussion_r1590520824
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/cache/FederationCaffeineCache.java:
##########
@@ -0,0 +1,125 @@
+/**
+ * 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.yarn.server.federation.cache;
+
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.exceptions.YarnException;
+import org.apache.hadoop.yarn.server.federation.store.FederationStateStore;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterId;
+import org.apache.hadoop.yarn.server.federation.store.records.SubClusterInfo;
+import
org.apache.hadoop.yarn.server.federation.store.records.SubClusterPolicyConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+public class FederationCaffeineCache extends FederationCache {
Review Comment:
@goiri Thank you for helping review the code! I will add some documentation.
> FederationStateStoreFacade Cache Support Caffeine
> -------------------------------------------------
>
> Key: YARN-11471
> URL: https://issues.apache.org/jira/browse/YARN-11471
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: federation
> Affects Versions: 3.4.0
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
> Labels: pull-request-available
>
> FederationStateStoreFacade Cache Support Caffeine
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