hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/MigrateRSGroupProcedure.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase.rsgroup;
  19
  20 import java.io.IOException;
  21 import java.util.Optional;
  22 import org.apache.hadoop.hbase.TableName;
  23 import org.apache.hadoop.hbase.client.TableDescriptor;
  24 import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
  25 import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
  26 import org.apache.hadoop.hbase.master.procedure.ModifyTableDescriptorProcedure;
  27 import org.apache.yetus.audience.InterfaceAudience;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 /**
  32  * Procedure for migrating rs group information to table descriptor.
  33  */
  34 @InterfaceAudience.Private
  35 public class MigrateRSGroupProcedure extends ModifyTableDescriptorProcedure {
  36
  37   private static final Logger LOG = LoggerFactory.getLogger(MigrateRSGroupProcedure.class);
  38
  39   public MigrateRSGroupProcedure() {
  40   }
  41
  42   public MigrateRSGroupProcedure(MasterProcedureEnv env, TableName tableName) {
  43     super(env, tableName);
  44   }
  45
  46   @Override
  47   protected Optional<TableDescriptor> modify(MasterProcedureEnv env, TableDescriptor current)
  48     throws IOException {
  49     if (current.getRegionServerGroup().isPresent()) {
  50       // usually this means user has set the rs group using the new code which will set the group
  51       // directly on table descriptor, skip.
  52       LOG.debug("Skip migrating {} since it is already in group {}", current.getTableName(),
  53         current.getRegionServerGroup().get());
  54       return Optional.empty();
  55     }
  56     RSGroupInfo group =
  57       env.getMasterServices().getRSGroupInfoManager().getRSGroupForTable(current.getTableName());
  58     if (group == null) {
  59       LOG.debug("RSGroup for table {} is empty when migrating, usually this should not happen" +
  60         " unless we have removed the RSGroup, ignore...", current.getTableName());
  61       return Optional.empty();
  62     }
  63     return Optional
  64       .of(TableDescriptorBuilder.newBuilder(current).setRegionServerGroup(group.getName()).build());
  65   }
  66 }