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 java.util.ArrayDeque;
022import java.util.Queue;
023import org.apache.hadoop.hbase.wal.WAL.Entry;
024
025public class FaultyProtobufWALStreamReader extends ProtobufWALStreamReader {
026
027  // public until class relocates to o.a.h.h.wal
028  public enum FailureType {
029    BEGINNING,
030    MIDDLE,
031    END,
032    NONE
033  }
034
035  Queue<Entry> nextQueue = new ArrayDeque<>();
036  int numberOfFileEntries = 0;
037
038  FailureType getFailureType() {
039    return FailureType.valueOf(conf.get("faultyprotobuflogreader.failuretype", "NONE"));
040  }
041
042  @Override
043  public Entry next(Entry reuse) throws IOException {
044    if (nextQueue.isEmpty()) { // Read the whole thing at once and fake reading
045      for (;;) {
046        Entry e = new Entry();
047        e = super.next(e);
048        if (e == null) {
049          break;
050        }
051        nextQueue.offer(e);
052        numberOfFileEntries++;
053      }
054    }
055
056    if (nextQueue.size() == this.numberOfFileEntries && getFailureType() == FailureType.BEGINNING) {
057      throw new IOException("fake Exception");
058    } else if (
059      nextQueue.size() == this.numberOfFileEntries / 2 && getFailureType() == FailureType.MIDDLE
060    ) {
061      throw new IOException("fake Exception");
062    } else if (nextQueue.size() == 1 && getFailureType() == FailureType.END) {
063      throw new IOException("fake Exception");
064    }
065
066    Entry e = nextQueue.poll();
067
068    if (e.getEdit().isEmpty()) {
069      return null;
070    }
071    return e;
072  }
073}