001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.apache.hadoop.hbase.master.assignment;
021
022import java.io.IOException;
023import java.util.Optional;
024
025import org.apache.hadoop.hbase.ServerName;
026import org.apache.hadoop.hbase.exceptions.UnexpectedStateException;
027import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
028import org.apache.hadoop.hbase.procedure2.ProcedureMetrics;
029import org.apache.hadoop.hbase.procedure2.ProcedureStateSerializer;
030import org.apache.hadoop.hbase.procedure2.RemoteProcedureDispatcher.RemoteOperation;
031import org.apache.yetus.audience.InterfaceAudience;
032
033import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
034import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.RegionTransitionState;
035import org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProcedureProtos.UnassignRegionStateData;
036import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
037
038/**
039 * Leave here only for checking if we can successfully start the master.
040 * @deprecated Do not use any more.
041 * @see TransitRegionStateProcedure
042 */
043@Deprecated
044@InterfaceAudience.Private
045public class UnassignProcedure extends RegionTransitionProcedure {
046
047  protected volatile ServerName hostingServer;
048
049  protected volatile ServerName destinationServer;
050
051  private boolean force;
052
053  private boolean removeAfterUnassigning;
054
055  public UnassignProcedure() {
056  }
057
058  @Override
059  public TableOperationType getTableOperationType() {
060    return TableOperationType.REGION_UNASSIGN;
061  }
062
063  @Override
064  protected boolean isRollbackSupported(final RegionTransitionState state) {
065    switch (state) {
066      case REGION_TRANSITION_QUEUE:
067      case REGION_TRANSITION_DISPATCH:
068        return true;
069      default:
070        return false;
071    }
072  }
073
074  @Override
075  protected void serializeStateData(ProcedureStateSerializer serializer) throws IOException {
076    UnassignRegionStateData.Builder state =
077      UnassignRegionStateData.newBuilder().setTransitionState(getTransitionState())
078        .setHostingServer(ProtobufUtil.toServerName(this.hostingServer))
079        .setRegionInfo(ProtobufUtil.toRegionInfo(getRegionInfo()));
080    if (this.destinationServer != null) {
081      state.setDestinationServer(ProtobufUtil.toServerName(destinationServer));
082    }
083    if (force) {
084      state.setForce(true);
085    }
086    if (removeAfterUnassigning) {
087      state.setRemoveAfterUnassigning(true);
088    }
089    if (getAttempt() > 0) {
090      state.setAttempt(getAttempt());
091    }
092    serializer.serialize(state.build());
093  }
094
095  @Override
096  protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {
097    final UnassignRegionStateData state = serializer.deserialize(UnassignRegionStateData.class);
098    setTransitionState(state.getTransitionState());
099    setRegionInfo(ProtobufUtil.toRegionInfo(state.getRegionInfo()));
100    this.hostingServer = ProtobufUtil.toServerName(state.getHostingServer());
101    force = state.getForce();
102    if (state.hasDestinationServer()) {
103      this.destinationServer = ProtobufUtil.toServerName(state.getDestinationServer());
104    }
105    removeAfterUnassigning = state.getRemoveAfterUnassigning();
106    if (state.hasAttempt()) {
107      setAttempt(state.getAttempt());
108    }
109  }
110
111  @Override
112  protected boolean startTransition(final MasterProcedureEnv env,
113      final RegionStateNode regionNode) {
114    // nothing to do here. we skip the step in the constructor
115    // by jumping to REGION_TRANSITION_DISPATCH
116    throw new UnsupportedOperationException();
117  }
118
119  @Override
120  protected boolean updateTransition(final MasterProcedureEnv env, final RegionStateNode regionNode)
121      throws IOException {
122    return true;
123  }
124
125  @Override
126  protected void finishTransition(final MasterProcedureEnv env, final RegionStateNode regionNode)
127      throws IOException {
128  }
129
130  @Override
131  public Optional<RemoteOperation> remoteCallBuild(final MasterProcedureEnv env,
132      final ServerName serverName) {
133    return Optional.empty();
134  }
135
136  @Override
137  protected void reportTransition(final MasterProcedureEnv env, final RegionStateNode regionNode,
138      final TransitionCode code, final long seqId) throws UnexpectedStateException {
139  }
140
141  /**
142   * @return If true, we will re-wake up this procedure; if false, the procedure stays suspended.
143   */
144  @Override
145  protected boolean remoteCallFailed(final MasterProcedureEnv env, final RegionStateNode regionNode,
146      final IOException exception) {
147    return true;
148  }
149
150  @Override
151  public void toStringClassDetails(StringBuilder sb) {
152    super.toStringClassDetails(sb);
153    sb.append(", server=").append(this.hostingServer);
154  }
155
156  @Override
157  protected ProcedureMetrics getProcedureMetrics(MasterProcedureEnv env) {
158    return env.getAssignmentManager().getAssignmentManagerMetrics().getUnassignProcMetrics();
159  }
160}