FaultyFSLog.java example

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/**
 *
 * 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.wal;

import java.io.IOException;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.TableName;

// imports for things that haven't moved yet
import org.apache.hadoop.hbase.regionserver.wal.FSHLog;
import org.apache.hadoop.hbase.regionserver.wal.WALEdit;

/**
 * This is a utility class, used by tests, which fails operation specified by FailureType enum
 */
@InterfaceAudience.Private
public class FaultyFSLog extends FSHLog {
  public enum FailureType {
    NONE, APPEND, SYNC
  }
  FailureType ft = FailureType.NONE;

  public FaultyFSLog(FileSystem fs, Path rootDir, String logName, Configuration conf)
      throws IOException {
    super(fs, rootDir, logName, conf);
  }
  
  public void setFailureType(FailureType fType) {
    this.ft = fType;
  }
  
  @Override
  public void sync(long txid) throws IOException {
    if (this.ft == FailureType.SYNC) {
      throw new IOException("sync");
    }
    super.sync(txid);
  }

  @Override
  public long append(HTableDescriptor htd, HRegionInfo info, WALKey key, WALEdit edits,
      AtomicLong sequenceId, boolean isInMemstore, List<Cell> cells) throws IOException {
    if (this.ft == FailureType.APPEND) {
      throw new IOException("append");
    }
    return super.append(htd, info, key, edits, sequenceId, isInMemstore, cells);
  }
}