/**
* Copyright 2008 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;
import java.io.IOException;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HServerAddress;
import org.apache.hadoop.hbase.HServerInfo;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.ipc.HRegionInterface;
import org.apache.hadoop.hbase.util.Bytes;
/**
* ProcessRegionOpen is instantiated when a region server reports that it is
* serving a region. This applies to all meta and user regions except the
* root region which is handled specially.
*/
class ProcessRegionOpen extends ProcessRegionStatusChange {
protected final HServerInfo serverInfo;
/**
* @param master
* @param info
* @param regionInfo
*/
public ProcessRegionOpen(HMaster master, HServerInfo info,
HRegionInfo regionInfo) {
super(master, regionInfo);
if (info == null) {
throw new NullPointerException("HServerInfo cannot be null; " +
"hbase-958 debugging");
}
this.serverInfo = info;
}
@Override
public String toString() {
return "PendingOpenOperation from " + HServerInfo.getServerName(serverInfo);
}
@Override
protected boolean process() throws IOException {
if (!metaRegionAvailable()) {
// We can't proceed unless the meta region we are going to update
// is online. metaRegionAvailable() has put this operation on the
// delayedToDoQueue, so return true so the operation is not put
// back on the toDoQueue
return true;
}
HRegionInterface server =
master.connection.getHRegionConnection(getMetaRegion().getServer());
LOG.info(regionInfo.getRegionNameAsString() + " open on " +
serverInfo.getServerAddress().toString());
// Register the newly-available Region's location.
Put p = new Put(regionInfo.getRegionName());
p.add(CATALOG_FAMILY, SERVER_QUALIFIER,
Bytes.toBytes(serverInfo.getServerAddress().toString()));
p.add(CATALOG_FAMILY, STARTCODE_QUALIFIER,
Bytes.toBytes(serverInfo.getStartCode()));
server.put(metaRegionName, p);
LOG.info("Updated row " + regionInfo.getRegionNameAsString() +
" in region " + Bytes.toString(metaRegionName) + " with startcode=" +
serverInfo.getStartCode() + ", server=" + serverInfo.getServerAddress());
synchronized (master.regionManager) {
if (isMetaTable) {
// It's a meta region.
MetaRegion m =
new MetaRegion(new HServerAddress(serverInfo.getServerAddress()),
regionInfo);
if (!master.regionManager.isInitialMetaScanComplete()) {
// Put it on the queue to be scanned for the first time.
if (LOG.isDebugEnabled()) {
LOG.debug("Adding " + m.toString() + " to regions to scan");
}
master.regionManager.addMetaRegionToScan(m);
} else {
// Add it to the online meta regions
if (LOG.isDebugEnabled()) {
LOG.debug("Adding to onlineMetaRegions: " + m.toString());
}
master.regionManager.putMetaRegionOnline(m);
// Interrupting the Meta Scanner sleep so that it can
// process regions right away
master.regionManager.metaScannerThread.interrupt();
}
}
// If updated successfully, remove from pending list if the state
// is consistent. For example, a disable could be called before the
// synchronization.
if(master.regionManager.
isOfflined(regionInfo.getRegionNameAsString())) {
LOG.warn("We opened a region while it was asked to be closed.");
} else {
master.regionManager.removeRegion(regionInfo);
}
return true;
}
}
@Override
protected int getPriority() {
return 0; // highest priority
}
}