| /** |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * 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.hbase.master.handler; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.HRegionInfo; |
| import org.apache.hadoop.hbase.Server; |
| import org.apache.hadoop.hbase.executor.EventHandler; |
| import org.apache.hadoop.hbase.master.AssignmentManager; |
| |
| /** |
| * Handles CLOSED region event on Master. |
| * <p> |
| * If table is being disabled, deletes ZK unassigned node and removes from |
| * regions in transition. |
| * <p> |
| * Otherwise, assigns the region to another server. |
| */ |
| public class ClosedRegionHandler extends EventHandler implements TotesHRegionInfo { |
| private static final Log LOG = LogFactory.getLog(ClosedRegionHandler.class); |
| private final AssignmentManager assignmentManager; |
| private final HRegionInfo regionInfo; |
| private final ClosedPriority priority; |
| |
| private enum ClosedPriority { |
| ROOT (1), |
| META (2), |
| USER (3); |
| |
| private final int value; |
| ClosedPriority(int value) { |
| this.value = value; |
| } |
| public int getValue() { |
| return value; |
| } |
| }; |
| |
| public ClosedRegionHandler(Server server, AssignmentManager assignmentManager, |
| HRegionInfo regionInfo) { |
| super(server, EventType.RS_ZK_REGION_CLOSED); |
| this.assignmentManager = assignmentManager; |
| this.regionInfo = regionInfo; |
| if(regionInfo.isRootRegion()) { |
| priority = ClosedPriority.ROOT; |
| } else if(regionInfo.isMetaRegion()) { |
| priority = ClosedPriority.META; |
| } else { |
| priority = ClosedPriority.USER; |
| } |
| } |
| |
| @Override |
| public int getPriority() { |
| return priority.getValue(); |
| } |
| |
| @Override |
| public HRegionInfo getHRegionInfo() { |
| return this.regionInfo; |
| } |
| |
| @Override |
| public void process() { |
| LOG.debug("Handling CLOSED event for " + regionInfo.getEncodedName()); |
| // Check if this table is being disabled or not |
| if (this.assignmentManager.getZKTable(). |
| isDisablingOrDisabledTable(this.regionInfo.getTableDesc().getNameAsString())) { |
| assignmentManager.offlineDisabledRegion(regionInfo); |
| return; |
| } |
| // ZK Node is in CLOSED state, assign it. |
| assignmentManager.setOffline(regionInfo); |
| assignmentManager.assign(regionInfo, true); |
| } |
| } |