/**
    * 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.master.procedure;
  
  import java.io.IOException;
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.DoNotRetryIOException;
  import org.apache.hadoop.hbase.HBaseTestingUtility;
  import org.apache.hadoop.hbase.HConstants;
  import org.apache.hadoop.hbase.HRegionInfo;
  import org.apache.hadoop.hbase.HTableDescriptor;
  import org.apache.hadoop.hbase.ProcedureInfo;
  import org.apache.hadoop.hbase.TableExistsException;
  import org.apache.hadoop.hbase.TableName;
  import org.apache.hadoop.hbase.Waiter;
  import org.apache.hadoop.hbase.procedure2.ProcedureExecutor;
  import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility;
  import org.apache.hadoop.hbase.protobuf.generated.MasterProcedureProtos.CreateTableState;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.util.JVMClusterUtil;
  import org.apache.hadoop.hbase.util.ModifyRegionUtils;
  import org.apache.hadoop.hdfs.DistributedFileSystem;
  import org.apache.hadoop.hdfs.MiniDFSCluster;
  import org.apache.hadoop.hdfs.protocol.HdfsConstants;
  import org.junit.After;
  import org.junit.AfterClass;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  @Category(MediumTests.class)
  public class TestSafemodeBringsDownMaster {
    private static final Log LOG = LogFactory.getLog(TestSafemodeBringsDownMaster.class);
  
    protected static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
  
    private static void setupConf(Configuration conf) {
      conf.setInt(MasterProcedureConstants.MASTER_PROCEDURE_THREADS, 1);
    }
  
    @BeforeClass
    public static void setupCluster() throws Exception {
      setupConf(UTIL.getConfiguration());
      UTIL.startMiniCluster(1);
    }
  
    @AfterClass
    public static void cleanupTest() throws Exception {
      try {
        UTIL.shutdownMiniCluster();
      } catch (Exception e) {
        LOG.warn("failure shutting down cluster", e);
      }
    }
  
    @Before
    public void setup() throws Exception {
      resetProcExecutorTestingKillFlag();
    }
  
    private ProcedureExecutor<MasterProcedureEnv> getMasterProcedureExecutor() {
      return UTIL.getHBaseCluster().getMaster().getMasterProcedureExecutor();
    }
    private void resetProcExecutorTestingKillFlag() {
      final ProcedureExecutor<MasterProcedureEnv> procExec = getMasterProcedureExecutor();
      ProcedureTestingUtility.setKillAndToggleBeforeStoreUpdate(procExec, false);
      assertTrue("expected executor to be running", procExec.isRunning());
    }
  
    @After
    public void tearDown() throws Exception {
    }
  
    @Test(timeout=60000)
   public void testSafemodeBringsDownMaster() throws Exception {
     final TableName tableName = TableName.valueOf("testSafemodeBringsDownMaster");
     final byte[][] splitKeys = new byte[][] {
       Bytes.toBytes("a"), Bytes.toBytes("b"), Bytes.toBytes("c")
     };
     HRegionInfo[] regions = MasterProcedureTestingUtility.createTable(
         getMasterProcedureExecutor(), tableName, splitKeys, "f1", "f2");
     MiniDFSCluster dfsCluster = UTIL.getDFSCluster();
     DistributedFileSystem dfs = (DistributedFileSystem) dfsCluster.getFileSystem();
     dfs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER);
     final long timeOut = 180000;
     long startTime = System.currentTimeMillis();
     int index = -1;
     do {
       index = UTIL.getMiniHBaseCluster().getServerWithMeta();
     } while (index == -1 &&
       startTime + timeOut < System.currentTimeMillis());
 
     if (index != -1){
       UTIL.getMiniHBaseCluster().abortRegionServer(index);
       UTIL.getMiniHBaseCluster().waitOnRegionServer(index);
     }
     UTIL.waitFor(timeOut, new Waiter.Predicate<Exception>() {
       @Override
       public boolean evaluate() throws Exception {
         List<JVMClusterUtil.MasterThread> threads = UTIL.getMiniHBaseCluster().getLiveMasterThreads();
         return threads == null || threads.isEmpty();
       }
     });
     dfs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_LEAVE);
   }
 }