/**
* 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.HServerInfo;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.executor.EventHandler;
import org.apache.hadoop.hbase.master.AssignmentManager;
import org.apache.hadoop.hbase.zookeeper.ZKAssign;
import org.apache.zookeeper.KeeperException;
/**
* Handles OPENED region event on Master.
*/
public class OpenedRegionHandler extends EventHandler implements TotesHRegionInfo {
private static final Log LOG = LogFactory.getLog(OpenedRegionHandler.class);
private final AssignmentManager assignmentManager;
private final HRegionInfo regionInfo;
private final HServerInfo serverInfo;
private final OpenedPriority priority;
private enum OpenedPriority {
ROOT (1),
META (2),
USER (3);
private final int value;
OpenedPriority(int value) {
this.value = value;
}
public int getValue() {
return value;
}
};
public OpenedRegionHandler(Server server,
AssignmentManager assignmentManager, HRegionInfo regionInfo,
HServerInfo serverInfo) {
super(server, EventType.RS_ZK_REGION_OPENED);
this.assignmentManager = assignmentManager;
this.regionInfo = regionInfo;
this.serverInfo = serverInfo;
if(regionInfo.isRootRegion()) {
priority = OpenedPriority.ROOT;
} else if(regionInfo.isMetaRegion()) {
priority = OpenedPriority.META;
} else {
priority = OpenedPriority.USER;
}
}
@Override
public int getPriority() {
return priority.getValue();
}
@Override
public HRegionInfo getHRegionInfo() {
return this.regionInfo;
}
@Override
public void process() {
LOG.debug("Handling OPENED event for " + this.regionInfo.getEncodedName() +
"; deleting unassigned node");
// Remove region from in-memory transition and unassigned node from ZK
try {
ZKAssign.deleteOpenedNode(server.getZooKeeper(),
regionInfo.getEncodedName());
} catch (KeeperException e) {
server.abort("Error deleting OPENED node in ZK for transition ZK node (" +
regionInfo.getEncodedName() + ")", e);
}
this.assignmentManager.regionOnline(regionInfo, serverInfo);
if (this.assignmentManager.getZKTable().isDisablingOrDisabledTable(
regionInfo.getTableDesc().getNameAsString())) {
LOG.debug("Opened region " + regionInfo.getRegionNameAsString() + " but "
+ "this table is disabled, triggering close of region");
assignmentManager.unassign(regionInfo);
} else {
LOG.debug("Opened region " + regionInfo.getRegionNameAsString() +
" on " + serverInfo.getServerName());
}
}
}