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.LinkedList;
022import java.util.Queue;
023
024import org.apache.hadoop.hbase.wal.WAL.Entry;
025import org.apache.hadoop.hbase.wal.WALEdit;
026import org.apache.hadoop.hbase.wal.WALKeyImpl;
027
028public class FaultyProtobufLogReader extends ProtobufLogReader {
029
030  // public until class relocates to o.a.h.h.wal
031  public enum FailureType {
032    BEGINNING, MIDDLE, END, NONE
033  }
034
035  Queue<Entry> nextQueue = new LinkedList<>();
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      boolean b;
046      do {
047        Entry e = new Entry();
048        if (compressionContext != null) {
049          e.setCompressionContext(compressionContext);
050        }
051        b = readNext(e);
052        nextQueue.offer(e);
053        numberOfFileEntries++;
054      } while (b);
055    }
056
057    if (nextQueue.size() == this.numberOfFileEntries && getFailureType() == FailureType.BEGINNING) {
058      throw new IOException("fake Exception");
059    } else if (nextQueue.size() == this.numberOfFileEntries / 2
060        && getFailureType() == FailureType.MIDDLE) {
061      throw new IOException("fake Exception");
062    } else if (nextQueue.size() == 1 && getFailureType() == FailureType.END) {
063      throw new IOException("fake Exception");
064    }
065
066    if (nextQueue.peek() != null) {
067      edit++;
068    }
069
070    Entry e = nextQueue.poll();
071
072    if (e.getEdit().isEmpty()) {
073      return null;
074    }
075    return e;
076  }
077}