001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver.wal;
019
020import java.io.IOException;
021import org.apache.hadoop.hbase.regionserver.LogRoller;
022import org.apache.hadoop.hbase.replication.SyncReplicationState;
023import org.apache.yetus.audience.InterfaceAudience;
024
025/**
026 * Thrown when {@link LogRoller} try to roll writer but the WAL already was closed. This may
027 * happened when peer's sync replication state was transited from
028 * {@link SyncReplicationState#ACTIVE} to {@link SyncReplicationState#DOWNGRADE_ACTIVE} and the
029 * region's WAL was changed to a new one. But the old WAL was still left in {@link LogRoller}.
030 */
031@InterfaceAudience.Private
032public class WALClosedException extends IOException {
033
034  private static final long serialVersionUID = -3183198896865290678L;
035
036  public WALClosedException() {
037    super();
038  }
039
040  /**
041   * @param msg exception message
042   */
043  public WALClosedException(String msg) {
044    super(msg);
045  }
046}