content: /**
   * Copyright The Apache Software Foundation
   *
   * 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 com.alibaba.wasp.master;
  
  import com.alibaba.wasp.EntityGroupInfo;
  import com.alibaba.wasp.FConstants;
  import com.alibaba.wasp.MiniWaspCluster;
  import com.alibaba.wasp.ServerName;
  import com.alibaba.wasp.WaspTestingUtility;
  import com.alibaba.wasp.executor.EventHandler;
  import com.alibaba.wasp.executor.EventHandler.EventHandlerListener;
  import com.alibaba.wasp.executor.EventHandler.EventType;
  import com.alibaba.wasp.fserver.redo.MemRedoLog;
  import com.alibaba.wasp.fserver.redo.Redo;
  import com.alibaba.wasp.meta.FMetaReader;
  import com.alibaba.wasp.meta.FTable;
  import com.google.common.base.Joiner;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.hadoop.hbase.util.Pair;
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class TestMaster {
    private static final WaspTestingUtility TEST_UTIL = new WaspTestingUtility();
    private static final Log LOG = LogFactory.getLog(TestMaster.class);
    private static final byte[] TABLENAME = Bytes.toBytes("TestMaster");
  
    @BeforeClass
    public static void beforeAllTests() throws Exception {
      TEST_UTIL.getConfiguration().setClass(FConstants.REDO_IMPL,
          MemRedoLog.class, Redo.class);
      // Start a cluster of two fservers.
      TEST_UTIL.startMiniCluster(2);
    }
  
    @AfterClass
    public static void afterAllTests() throws Exception {
      TEST_UTIL.shutdownMiniCluster();
    }
  
    @Test
    public void testMasterOpsWhileSplitting() throws Exception {
      MiniWaspCluster cluster = TEST_UTIL.getWaspCluster();
      FMaster m = cluster.getMaster();
  
      FTable ft = TEST_UTIL.createTable(TABLENAME);
      assertTrue(m.assignmentManager.getZKTable().isEnabledTable(
          Bytes.toString(TABLENAME)));
      TEST_UTIL.loadTable(ft);
  
      List<Pair<EntityGroupInfo, ServerName>> tableEntityGroups = FMetaReader
          .getTableEntityGroupsAndLocations(TEST_UTIL.getConfiguration(),
              TABLENAME);
      LOG.info("EntityGroups after load: "
          + Joiner.on(',').join(tableEntityGroups));
      assertEquals(1, tableEntityGroups.size());
      assertArrayEquals(FConstants.EMPTY_START_ROW, tableEntityGroups.get(0)
          .getFirst().getStartKey());
      assertArrayEquals(FConstants.EMPTY_END_ROW, tableEntityGroups.get(0)
          .getFirst().getEndKey());
  
      // Now trigger a split and stop when the split is in progress
      CountDownLatch split = new CountDownLatch(1);
      CountDownLatch proceed = new CountDownLatch(1);
      EntityGroupSplitListener list = new EntityGroupSplitListener(split, proceed);
      cluster.getMaster().executorService.registerListener(
          EventType.FSERVER_ZK_ENTITYGROUP_SPLIT, list);
  
      LOG.info("Splitting table");
      TEST_UTIL.getWaspAdmin().split(TABLENAME, Bytes.toBytes("1234"));
      LOG.info("Waiting for split result to be about to open");
      split.await(60, TimeUnit.SECONDS);
      try {
        LOG.info("Making sure we can call getTableEntityGroups while opening");
        tableEntityGroups = FMetaReader.getTableEntityGroupsAndLocations(
            TEST_UTIL.getConfiguration(), TABLENAME, false);
  
        LOG.info("EntityGroups: " + Joiner.on(',').join(tableEntityGroups));
        // We have three entitygroups because one is split-in-progress
        assertEquals(3, tableEntityGroups.size());
        LOG.info("Making sure we can call getTableEntityGroupClosest while opening");
        Pair<EntityGroupInfo, ServerName> pair = m.getTableEntityGroupForRow(
            TABLENAME, Bytes.toBytes("cde"));
        LOG.info("Result is: " + pair);
        Pair<EntityGroupInfo, ServerName> tableEntityGroupFromName = FMetaReader
            .getEntityGroup(TEST_UTIL.getConfiguration(), pair.getFirst()
                .getEntityGroupName());
        assertEquals(tableEntityGroupFromName.getFirst(), pair.getFirst());
      } finally {
        proceed.countDown();
      }
    }
  
    static class EntityGroupSplitListener implements EventHandlerListener {
      CountDownLatch split, proceed;
  
      public EntityGroupSplitListener(CountDownLatch split, CountDownLatch proceed) {
        this.split = split;
        this.proceed = proceed;
      }
  
      @Override
      public void afterProcess(EventHandler event) {
        if (event.getEventType() != EventType.FSERVER_ZK_ENTITYGROUP_SPLIT) {
          return;
        }
        try {
          split.countDown();
          proceed.await(60, TimeUnit.SECONDS);
        } catch (InterruptedException ie) {
          throw new RuntimeException(ie);
        }
        return;
      }
  
      @Override
      public void beforeProcess(EventHandler event) {
      }
    }
  }