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/**
*
* 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.client.locking;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Abortable;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.NonceGenerator;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;
import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
import org.apache.hadoop.hbase.shaded.protobuf.generated.LockServiceProtos.LockRequest;
import org.apache.hadoop.hbase.shaded.protobuf.generated.LockServiceProtos.LockService;
import org.apache.hadoop.hbase.shaded.protobuf.generated.LockServiceProtos.LockType;
/**
* Helper class to create "master locks" for namespaces, tables and regions.
* DEV-NOTE: At the moment this class is used only by the RS for MOB,
* to prevent other MOB compaction to conflict.
* The RS has already the stub of the LockService, so we have only one constructor that
* takes the LockService stub. If in the future we are going to use this in other places
* we should add a constructor that from conf or connection, creates the stub.
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.TOOLS)
@InterfaceStability.Evolving
public class LockServiceClient {
private final LockService.BlockingInterface stub;
private final Configuration conf;
private final NonceGenerator ng;
public LockServiceClient(final Configuration conf, final LockService.BlockingInterface stub,
final NonceGenerator ng) {
this.conf = conf;
this.stub = stub;
this.ng = ng;
}
/**
* Create a new EntityLock object to acquire an exclusive or shared lock on a table.
* Internally, the table namespace will also be locked in shared mode.
*/
public EntityLock tableLock(final TableName tableName, final boolean exclusive,
final String description, final Abortable abort) {
LockRequest lockRequest = buildLockRequest(exclusive ? LockType.EXCLUSIVE : LockType.SHARED,
tableName.getNameAsString(), null, null, description, ng.getNonceGroup(), ng.newNonce());
return new EntityLock(conf, stub, lockRequest, abort);
}
/**
* LocCreate a new EntityLock object to acquire exclusive lock on a namespace.
* Clients can not acquire shared locks on namespace.
*/
public EntityLock namespaceLock(String namespace, String description, Abortable abort) {
LockRequest lockRequest = buildLockRequest(LockType.EXCLUSIVE,
namespace, null, null, description, ng.getNonceGroup(), ng.newNonce());
return new EntityLock(conf, stub, lockRequest, abort);
}
/**
* Create a new EntityLock object to acquire exclusive lock on multiple regions of same tables.
* Internally, the table and its namespace will also be locked in shared mode.
*/
public EntityLock regionLock(List regionInfos, String description, Abortable abort) {
LockRequest lockRequest = buildLockRequest(LockType.EXCLUSIVE,
null, null, regionInfos, description, ng.getNonceGroup(), ng.newNonce());
return new EntityLock(conf, stub, lockRequest, abort);
}
@InterfaceAudience.Private
public static LockRequest buildLockRequest(final LockType type,
final String namespace, final TableName tableName, final List regionInfos,
final String description, final long nonceGroup, final long nonce) {
final LockRequest.Builder builder = LockRequest.newBuilder()
.setLockType(type)
.setNonceGroup(nonceGroup)
.setNonce(nonce);
if (regionInfos != null) {
for (RegionInfo hri: regionInfos) {
builder.addRegionInfo(ProtobufUtil.toRegionInfo(hri));
}
} else if (namespace != null) {
builder.setNamespace(namespace);
} else if (tableName != null) {
builder.setTableName(ProtobufUtil.toProtoTableName(tableName));
}
return builder.setDescription(description).build();
}
}
