kfaraz commented on code in PR #17899: URL: https://github.com/apache/druid/pull/17899#discussion_r2052104015
########## server/src/main/java/org/apache/druid/client/CoordinatorDynamicConfigView.java: ########## @@ -0,0 +1,102 @@ +/* + * 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.druid.client; + +import com.google.common.collect.ImmutableSet; +import com.google.errorprone.annotations.concurrent.GuardedBy; +import com.google.inject.Inject; +import org.apache.druid.client.coordinator.CoordinatorClient; +import org.apache.druid.java.util.common.lifecycle.LifecycleStart; +import org.apache.druid.java.util.common.logger.Logger; +import org.apache.druid.server.DruidInternalDynamicConfigResource; +import org.apache.druid.server.coordinator.CoordinatorDynamicConfig; + +import javax.validation.constraints.NotNull; +import java.util.Map; +import java.util.Set; + +/** + * Broker view of the coordinator dynamic configuration, and its derived values such as target and source clone servers. + * This class is registered as a managed lifecycle to fetch the coordinator dynamic configuration on startup. Further + * updates are handled through {@link DruidInternalDynamicConfigResource}. + */ +public class CoordinatorDynamicConfigView +{ + private static final Logger log = new Logger(CoordinatorDynamicConfigView.class); + private final CoordinatorClient coordinatorClient; + + @GuardedBy("this") + private CoordinatorDynamicConfig config; Review Comment: We shouldn't need to pre-compute the lists. Do you want to do that for perf reasons? This class should ideally not have the `getSourceServers` and `getTargetServers` methods at all. The caller can just get the dynamic config and perform any required operation on it. Having separate methods for `getConfig`, `getSource` and `getTarget` makes it more error prone. A caller may make calls to these methods in subsequent lines and still get back inconsistent results, as another thread could have updated the config in the mean time. Let me know if this makes sense. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
