/**
 * 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.mapred;

import java.io.IOException;

/**
 * This exception is thrown when the JobTracker is in safe mode.
 */
public class SafeModeException extends IOException {

  private static final long serialVersionUID = 1984839257L;

  /**
   * SafeModeException
   * @param adminUser admin who put JobTracker in safe-mode, 
   *                  <code>null</code> if it was automatic
   * 
   */
  public SafeModeException(String adminUser) {
    super(
        (adminUser == null) ? 
            "JobTracker is in safe mode" : 
              "JobTracker is in safe-mode set by admin " + adminUser);
  }

}