/**
* 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.util;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.NotServingRegionException;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HConnectionManager;
import org.apache.hadoop.hbase.ipc.HRegionInterface;
import org.apache.zookeeper.KeeperException;
public class HBaseFsckRepair {
/**
* Fix dupe assignment by doing silent closes on each RS hosting the region
* and then force ZK unassigned node to OFFLINE to trigger assignment by
* master.
* @param admin
* @param region
* @param servers
* @throws IOException
* @throws KeeperException
* @throws InterruptedException
*/
public static void fixDupeAssignment(HBaseAdmin admin, HRegionInfo region,
List<ServerName> servers)
throws IOException, KeeperException, InterruptedException {
HRegionInfo actualRegion = new HRegionInfo(region);
// Close region on the servers silently
for(ServerName server : servers) {
closeRegionSilentlyAndWait(admin.getConfiguration(), server, actualRegion);
}
// Force ZK node to OFFLINE so master assigns
forceOfflineInZK(admin, actualRegion);
}
/**
* Fix unassigned by creating/transition the unassigned ZK node for this
* region to OFFLINE state with a special flag to tell the master that this
* is a forced operation by HBCK.
* @param admin
* @param region
* @throws IOException
* @throws KeeperException
*/
public static void fixUnassigned(HBaseAdmin admin, HRegionInfo region)
throws IOException, KeeperException {
HRegionInfo actualRegion = new HRegionInfo(region);
// Force ZK node to OFFLINE so master assigns
forceOfflineInZK(admin, actualRegion);
}
private static void forceOfflineInZK(HBaseAdmin admin, final HRegionInfo region)
throws ZooKeeperConnectionException, KeeperException, IOException {
admin.assign(region.getRegionName());
}
private static void closeRegionSilentlyAndWait(Configuration conf,
ServerName server, HRegionInfo region) throws IOException,
InterruptedException {
HConnection connection = HConnectionManager.getConnection(conf);
boolean success = false;
try {
HRegionInterface rs =
connection.getHRegionConnection(server.getHostname(), server.getPort());
rs.closeRegion(region, false);
long timeout = conf.getLong("hbase.hbck.close.timeout", 120000);
long expiration = timeout + System.currentTimeMillis();
while (System.currentTimeMillis() < expiration) {
try {
HRegionInfo rsRegion = rs.getRegionInfo(region.getRegionName());
if (rsRegion == null)
throw new NotServingRegionException();
} catch (Exception e) {
success = true;
return;
}
Thread.sleep(1000);
}
throw new IOException("Region " + region + " failed to close within"
+ " timeout " + timeout);
} finally {
try {
connection.close();
} catch (IOException ioe) {
if (success) {
throw ioe;
}
}
}
}
}