MasterKillingMonkeyFactory.java example

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hbase-master
/**
 * 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.chaos.factories;

import org.apache.hadoop.hbase.chaos.actions.Action;
import org.apache.hadoop.hbase.chaos.actions.DumpClusterStatusAction;
import org.apache.hadoop.hbase.chaos.actions.RestartActiveMasterAction;
import org.apache.hadoop.hbase.chaos.monkies.ChaosMonkey;
import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
import org.apache.hadoop.hbase.chaos.policies.PeriodicRandomActionPolicy;

/**
 * A chaos monkey to kill the active master periodically. Can be run in single master
 * or multi master setup.
 */
public class MasterKillingMonkeyFactory extends MonkeyFactory {

  private long action1Period;
  private long action2Period;

  private long restartActiveMasterSleepTime;

  @Override
  public ChaosMonkey build() {
    loadProperties();

    // Destructive actions to mess things around.
    Action[] actions1 = new Action[] {
        new RestartActiveMasterAction(restartActiveMasterSleepTime),
    };

    // Action to log more info for debugging
    Action[] actions2 = new Action[] {
        new DumpClusterStatusAction()
    };

    return new PolicyBasedChaosMonkey(util,
        new PeriodicRandomActionPolicy(action1Period, actions1),
        new PeriodicRandomActionPolicy(action2Period, actions2));
  }

  private void loadProperties() {

      action1Period = Long.parseLong(this.properties.getProperty(
        MonkeyConstants.PERIODIC_ACTION1_PERIOD,
        MonkeyConstants.DEFAULT_PERIODIC_ACTION1_PERIOD + ""));
      action2Period = Long.parseLong(this.properties.getProperty(
        MonkeyConstants.PERIODIC_ACTION2_PERIOD,
        MonkeyConstants.DEFAULT_PERIODIC_ACTION2_PERIOD + ""));
      restartActiveMasterSleepTime = Long.parseLong(this.properties.getProperty(
        MonkeyConstants.RESTART_ACTIVE_MASTER_SLEEP_TIME,
        MonkeyConstants.DEFAULT_RESTART_ACTIVE_MASTER_SLEEP_TIME + ""));
  }

}