001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.rsgroup;
019
020import java.io.IOException;
021import java.util.Optional;
022import org.apache.hadoop.hbase.TableName;
023import org.apache.hadoop.hbase.client.TableDescriptor;
024import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
025import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
026import org.apache.hadoop.hbase.master.procedure.ModifyTableDescriptorProcedure;
027import org.apache.yetus.audience.InterfaceAudience;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031/**
032 * Procedure for migrating rs group information to table descriptor.
033 */
034@InterfaceAudience.Private
035public class MigrateRSGroupProcedure extends ModifyTableDescriptorProcedure {
036
037  private static final Logger LOG = LoggerFactory.getLogger(MigrateRSGroupProcedure.class);
038
039  public MigrateRSGroupProcedure() {
040  }
041
042  public MigrateRSGroupProcedure(MasterProcedureEnv env, TableName tableName) {
043    super(env, tableName);
044  }
045
046  @Override
047  protected Optional<TableDescriptor> modify(MasterProcedureEnv env, TableDescriptor current)
048    throws IOException {
049    if (current.getRegionServerGroup().isPresent()) {
050      // usually this means user has set the rs group using the new code which will set the group
051      // directly on table descriptor, skip.
052      LOG.debug("Skip migrating {} since it is already in group {}", current.getTableName(),
053        current.getRegionServerGroup().get());
054      return Optional.empty();
055    }
056    RSGroupInfo group =
057      env.getMasterServices().getRSGroupInfoManager().getRSGroupForTable(current.getTableName());
058    if (group == null) {
059      LOG.debug("RSGroup for table {} is empty when migrating, usually this should not happen"
060        + " unless we have removed the RSGroup, ignore...", current.getTableName());
061      return Optional.empty();
062    }
063    return Optional
064      .of(TableDescriptorBuilder.newBuilder(current).setRegionServerGroup(group.getName()).build());
065  }
066}