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.mapreduce;
019
020import java.io.IOException;
021import java.util.Base64;
022import org.apache.hadoop.conf.Configuration;
023import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
024import org.apache.hadoop.hbase.util.Pair;
025import org.apache.hadoop.io.LongWritable;
026import org.apache.hadoop.io.Text;
027import org.apache.hadoop.mapreduce.Counter;
028import org.apache.hadoop.mapreduce.Mapper;
029import org.apache.yetus.audience.InterfaceAudience;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033/**
034 * Write table content out to map output files.
035 */
036@InterfaceAudience.Public
037public class TsvImporterTextMapper
038  extends Mapper<LongWritable, Text, ImmutableBytesWritable, Text> {
039  private static final Logger LOG = LoggerFactory.getLogger(TsvImporterTextMapper.class);
040
041  /** Column seperator */
042  private String separator;
043
044  /** Should skip bad lines */
045  private boolean skipBadLines;
046  private Counter badLineCount;
047  private boolean logBadLines;
048
049  private ImportTsv.TsvParser parser;
050
051  public boolean getSkipBadLines() {
052    return skipBadLines;
053  }
054
055  public Counter getBadLineCount() {
056    return badLineCount;
057  }
058
059  public void incrementBadLineCount(int count) {
060    this.badLineCount.increment(count);
061  }
062
063  /**
064   * Handles initializing this class with objects specific to it (i.e., the parser). Common
065   * initialization that might be leveraged by a subclass is done in <code>doSetup</code>. Hence a
066   * subclass may choose to override this method and call <code>doSetup</code> as well before
067   * handling it's own custom params. n
068   */
069  @Override
070  protected void setup(Context context) {
071    doSetup(context);
072
073    Configuration conf = context.getConfiguration();
074
075    parser = new ImportTsv.TsvParser(conf.get(ImportTsv.COLUMNS_CONF_KEY), separator);
076    if (parser.getRowKeyColumnIndex() == -1) {
077      throw new RuntimeException("No row key column specified");
078    }
079  }
080
081  /**
082   * Handles common parameter initialization that a subclass might want to leverage. n
083   */
084  protected void doSetup(Context context) {
085    Configuration conf = context.getConfiguration();
086
087    // If a custom separator has been used,
088    // decode it back from Base64 encoding.
089    separator = conf.get(ImportTsv.SEPARATOR_CONF_KEY);
090    if (separator == null) {
091      separator = ImportTsv.DEFAULT_SEPARATOR;
092    } else {
093      separator = new String(Base64.getDecoder().decode(separator));
094    }
095
096    skipBadLines = context.getConfiguration().getBoolean(ImportTsv.SKIP_LINES_CONF_KEY, true);
097    logBadLines = context.getConfiguration().getBoolean(ImportTsv.LOG_BAD_LINES_CONF_KEY, false);
098    badLineCount = context.getCounter("ImportTsv", "Bad Lines");
099  }
100
101  /**
102   * Convert a line of TSV text into an HBase table row.
103   */
104  @Override
105  public void map(LongWritable offset, Text value, Context context) throws IOException {
106    try {
107      Pair<Integer, Integer> rowKeyOffests =
108        parser.parseRowKey(value.getBytes(), value.getLength());
109      ImmutableBytesWritable rowKey = new ImmutableBytesWritable(value.getBytes(),
110        rowKeyOffests.getFirst(), rowKeyOffests.getSecond());
111      context.write(rowKey, value);
112    } catch (ImportTsv.TsvParser.BadTsvLineException | IllegalArgumentException badLine) {
113      if (logBadLines) {
114        System.err.println(value);
115      }
116      System.err.println("Bad line at offset: " + offset.get() + ":\n" + badLine.getMessage());
117      if (skipBadLines) {
118        incrementBadLineCount(1);
119        return;
120      }
121      throw new IOException(badLine);
122    } catch (InterruptedException e) {
123      LOG.error("Interrupted while emitting TSV text", e);
124      Thread.currentThread().interrupt();
125    }
126  }
127}