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Server functionality for HBase
/**
*
* 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 java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HConnection;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.master.RegionState;
import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.protobuf.generated.AdminProtos.AdminService;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.zookeeper.KeeperException;
/**
* This class contains helper methods that repair parts of hbase's filesystem
* contents.
*/
@InterfaceAudience.Private
public class HBaseFsckRepair {
public static final Log LOG = LogFactory.getLog(HBaseFsckRepair.class);
/**
* Fix multiple 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 HBase admin used to undeploy
* @param region Region to undeploy
* @param servers list of Servers to undeploy from
*/
public static void fixMultiAssignment(HBaseAdmin admin, HRegionInfo region,
List servers)
throws IOException, KeeperException, InterruptedException {
HRegionInfo actualRegion = new HRegionInfo(region);
// Close region on the servers silently
for(ServerName server : servers) {
closeRegionSilentlyAndWait(admin, 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.
*
* This assumes that info is in META.
*
* @param admin
* @param region
* @throws IOException
* @throws KeeperException
*/
public static void fixUnassigned(Admin admin, HRegionInfo region)
throws IOException, KeeperException, InterruptedException {
HRegionInfo actualRegion = new HRegionInfo(region);
// Force ZK node to OFFLINE so master assigns
forceOfflineInZK(admin, actualRegion);
}
/**
* In 0.90, this forces an HRI offline by setting the RegionTransitionData
* in ZK to have HBCK_CODE_NAME as the server. This is a special case in
* the AssignmentManager that attempts an assign call by the master.
*
* @see org.apache.hadoop.hbase.master.AssignementManager#handleHBCK
*
* This doesn't seem to work properly in the updated version of 0.92+'s hbck
* so we use assign to force the region into transition. This has the
* side-effect of requiring a HRegionInfo that considers regionId (timestamp)
* in comparators that is addressed by HBASE-5563.
*/
private static void forceOfflineInZK(Admin admin, final HRegionInfo region)
throws ZooKeeperConnectionException, KeeperException, IOException, InterruptedException {
admin.assign(region.getRegionName());
}
/*
* Should we check all assignments or just not in RIT?
*/
public static void waitUntilAssigned(Admin admin,
HRegionInfo region) throws IOException, InterruptedException {
long timeout = admin.getConfiguration().getLong("hbase.hbck.assign.timeout", 120000);
long expiration = timeout + System.currentTimeMillis();
while (System.currentTimeMillis() < expiration) {
try {
Map rits=
admin.getClusterStatus().getRegionsInTransition();
if (rits.keySet() != null && !rits.keySet().contains(region.getEncodedName())) {
// yay! no longer RIT
return;
}
// still in rit
LOG.info("Region still in transition, waiting for "
+ "it to become assigned: " + region);
} catch (IOException e) {
LOG.warn("Exception when waiting for region to become assigned,"
+ " retrying", e);
}
Thread.sleep(1000);
}
throw new IOException("Region " + region + " failed to move out of " +
"transition within timeout " + timeout + "ms");
}
/**
* Contacts a region server and waits up to hbase.hbck.close.timeout ms
* (default 120s) to close the region. This bypasses the active hmaster.
*/
@SuppressWarnings("deprecation")
public static void closeRegionSilentlyAndWait(HBaseAdmin admin,
ServerName server, HRegionInfo region) throws IOException, InterruptedException {
HConnection connection = admin.getConnection();
AdminService.BlockingInterface rs = connection.getAdmin(server);
try {
ProtobufUtil.closeRegion(rs, server, region.getRegionName(), false);
} catch (IOException e) {
LOG.warn("Exception when closing region: " + region.getRegionNameAsString(), e);
}
long timeout = admin.getConfiguration()
.getLong("hbase.hbck.close.timeout", 120000);
long expiration = timeout + System.currentTimeMillis();
while (System.currentTimeMillis() < expiration) {
try {
HRegionInfo rsRegion =
ProtobufUtil.getRegionInfo(rs, region.getRegionName());
if (rsRegion == null) return;
} catch (IOException ioe) {
return;
}
Thread.sleep(1000);
}
throw new IOException("Region " + region + " failed to close within"
+ " timeout " + timeout);
}
/**
* Puts the specified HRegionInfo into META.
*/
public static void fixMetaHoleOnline(Configuration conf,
HRegionInfo hri) throws IOException {
Table meta = new HTable(conf, TableName.META_TABLE_NAME);
MetaTableAccessor.addRegionToMeta(meta, hri);
meta.close();
}
/**
* Creates, flushes, and closes a new region.
*/
public static HRegion createHDFSRegionDir(Configuration conf,
HRegionInfo hri, HTableDescriptor htd) throws IOException {
// Create HRegion
Path root = FSUtils.getRootDir(conf);
HRegion region = HRegion.createHRegion(hri, root, conf, htd, null);
// Close the new region to flush to disk. Close log file too.
region.close();
return region;
}
}