| /* |
| * 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.solr.cloud; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.solr.client.solrj.cloud.ShardTerms; |
| import org.apache.solr.core.CoreContainer; |
| import org.apache.solr.core.CoreDescriptor; |
| import org.apache.solr.core.SolrCore; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Start recovery of a core if its term is less than leader's term |
| */ |
| public class RecoveringCoreTermWatcher implements ZkShardTerms.CoreTermWatcher { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| private final CoreDescriptor coreDescriptor; |
| private final CoreContainer coreContainer; |
| // used to prevent the case when term of other replicas get changed, we redo recovery |
| // the idea here is with a specific term of a replica, we only do recovery one |
| private final AtomicLong lastTermDoRecovery; |
| |
| RecoveringCoreTermWatcher(CoreDescriptor coreDescriptor, CoreContainer coreContainer) { |
| this.coreDescriptor = coreDescriptor; |
| this.coreContainer = coreContainer; |
| this.lastTermDoRecovery = new AtomicLong(-1); |
| } |
| |
| @Override |
| public boolean onTermChanged(ShardTerms terms) { |
| if (coreContainer.isShutDown()) return false; |
| |
| try (SolrCore solrCore = coreContainer.getCore(coreDescriptor.getName())) { |
| if (solrCore == null || solrCore.isClosed()) { |
| return false; |
| } |
| |
| if (solrCore.getCoreDescriptor() == null || solrCore.getCoreDescriptor().getCloudDescriptor() == null) return true; |
| String coreNodeName = solrCore.getCoreDescriptor().getCloudDescriptor().getCoreNodeName(); |
| if (terms.haveHighestTermValue(coreNodeName)) return true; |
| if (lastTermDoRecovery.get() < terms.getTerm(coreNodeName)) { |
| log.info("Start recovery on {} because core's term is less than leader's term", coreNodeName); |
| lastTermDoRecovery.set(terms.getTerm(coreNodeName)); |
| solrCore.getUpdateHandler().getSolrCoreState().doRecovery(solrCore.getCoreContainer(), solrCore.getCoreDescriptor()); |
| } |
| } catch (Exception e) { |
| if (log.isInfoEnabled()) { |
| log.info("Failed to watch term of core {}", coreDescriptor.getName(), e); |
| } |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| RecoveringCoreTermWatcher that = (RecoveringCoreTermWatcher) o; |
| |
| return coreDescriptor.getName().equals(that.coreDescriptor.getName()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return coreDescriptor.getName().hashCode(); |
| } |
| } |