/**
* Copyright 2010 The Apache Software Foundation
*
* 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.mapreduce;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.ImportTsv.TsvParser.BadTsvLineException;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Counter;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.GenericOptionsParser;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
/**
* Tool to import data from a TSV file.
*
* This tool is rather simplistic - it doesn't do any quoting or
* escaping, but is useful for many data loads.
*
* @see ImportTsv#usage(String)
*/
public class ImportTsv {
final static String NAME = "importtsv";
final static String SKIP_LINES_CONF_KEY = "importtsv.skip.bad.lines";
final static String BULK_OUTPUT_CONF_KEY = "importtsv.bulk.output";
final static String COLUMNS_CONF_KEY = "importtsv.columns";
final static String SEPARATOR_CONF_KEY = "importtsv.separator";
final static String DEFAULT_SEPARATOR = "\t";
static class TsvParser {
/**
* Column families and qualifiers mapped to the TSV columns
*/
private final byte[][] families;
private final byte[][] qualifiers;
private final byte separatorByte;
private int rowKeyColumnIndex;
public static String ROWKEY_COLUMN_SPEC="HBASE_ROW_KEY";
/**
* @param columnsSpecification the list of columns to parser out, comma separated.
* The row key should be the special token TsvParser.ROWKEY_COLUMN_SPEC
*/
public TsvParser(String columnsSpecification, String separatorStr) {
// Configure separator
byte[] separator = Bytes.toBytes(separatorStr);
Preconditions.checkArgument(separator.length == 1,
"TsvParser only supports single-byte separators");
separatorByte = separator[0];
// Configure columns
ArrayList<String> columnStrings = Lists.newArrayList(
Splitter.on(',').trimResults().split(columnsSpecification));
families = new byte[columnStrings.size()][];
qualifiers = new byte[columnStrings.size()][];
for (int i = 0; i < columnStrings.size(); i++) {
String str = columnStrings.get(i);
if (ROWKEY_COLUMN_SPEC.equals(str)) {
rowKeyColumnIndex = i;
continue;
}
String[] parts = str.split(":", 2);
if (parts.length == 1) {
families[i] = str.getBytes();
qualifiers[i] = HConstants.EMPTY_BYTE_ARRAY;
} else {
families[i] = parts[0].getBytes();
qualifiers[i] = parts[1].getBytes();
}
}
}
public int getRowKeyColumnIndex() {
return rowKeyColumnIndex;
}
public byte[] getFamily(int idx) {
return families[idx];
}
public byte[] getQualifier(int idx) {
return qualifiers[idx];
}
public ParsedLine parse(byte[] lineBytes, int length)
throws BadTsvLineException {
// Enumerate separator offsets
ArrayList<Integer> tabOffsets = new ArrayList<Integer>(families.length);
for (int i = 0; i < length; i++) {
if (lineBytes[i] == separatorByte) {
tabOffsets.add(i);
}
}
if (tabOffsets.isEmpty()) {
throw new BadTsvLineException("No delimiter");
}
tabOffsets.add(length);
if (tabOffsets.size() > families.length) {
throw new BadTsvLineException("Excessive columns");
} else if (tabOffsets.size() <= getRowKeyColumnIndex()) {
throw new BadTsvLineException("No row key");
}
return new ParsedLine(tabOffsets, lineBytes);
}
class ParsedLine {
private final ArrayList<Integer> tabOffsets;
private byte[] lineBytes;
ParsedLine(ArrayList<Integer> tabOffsets, byte[] lineBytes) {
this.tabOffsets = tabOffsets;
this.lineBytes = lineBytes;
}
public int getRowKeyOffset() {
return getColumnOffset(rowKeyColumnIndex);
}
public int getRowKeyLength() {
return getColumnLength(rowKeyColumnIndex);
}
public int getColumnOffset(int idx) {
if (idx > 0)
return tabOffsets.get(idx - 1) + 1;
else
return 0;
}
public int getColumnLength(int idx) {
return tabOffsets.get(idx) - getColumnOffset(idx);
}
public int getColumnCount() {
return tabOffsets.size();
}
public byte[] getLineBytes() {
return lineBytes;
}
}
public static class BadTsvLineException extends Exception {
public BadTsvLineException(String err) {
super(err);
}
private static final long serialVersionUID = 1L;
}
}
/**
* Write table content out to files in hdfs.
*/
static class TsvImporter
extends Mapper<LongWritable, Text, ImmutableBytesWritable, Put>
{
/** Timestamp for all inserted rows */
private long ts;
/** Should skip bad lines */
private boolean skipBadLines;
private Counter badLineCount;
private TsvParser parser;
@Override
protected void setup(Context context) {
Configuration conf = context.getConfiguration();
parser = new TsvParser(conf.get(COLUMNS_CONF_KEY),
conf.get(SEPARATOR_CONF_KEY, DEFAULT_SEPARATOR));
if (parser.getRowKeyColumnIndex() == -1) {
throw new RuntimeException("No row key column specified");
}
ts = System.currentTimeMillis();
skipBadLines = context.getConfiguration().getBoolean(
SKIP_LINES_CONF_KEY, true);
badLineCount = context.getCounter("ImportTsv", "Bad Lines");
}
/**
* Convert a line of TSV text into an HBase table row.
*/
@Override
public void map(LongWritable offset, Text value,
Context context)
throws IOException {
byte[] lineBytes = value.getBytes();
try {
TsvParser.ParsedLine parsed = parser.parse(
lineBytes, value.getLength());
ImmutableBytesWritable rowKey =
new ImmutableBytesWritable(lineBytes,
parsed.getRowKeyOffset(),
parsed.getRowKeyLength());
Put put = new Put(rowKey.copyBytes());
for (int i = 0; i < parsed.getColumnCount(); i++) {
if (i == parser.getRowKeyColumnIndex()) continue;
KeyValue kv = new KeyValue(
lineBytes, parsed.getRowKeyOffset(), parsed.getRowKeyLength(),
parser.getFamily(i), 0, parser.getFamily(i).length,
parser.getQualifier(i), 0, parser.getQualifier(i).length,
ts,
KeyValue.Type.Put,
lineBytes, parsed.getColumnOffset(i), parsed.getColumnLength(i));
put.add(kv);
}
context.write(rowKey, put);
} catch (BadTsvLineException badLine) {
if (skipBadLines) {
System.err.println(
"Bad line at offset: " + offset.get() + ":\n" +
badLine.getMessage());
badLineCount.increment(1);
return;
} else {
throw new IOException(badLine);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
* Sets up the actual job.
*
* @param conf The current configuration.
* @param args The command line parameters.
* @return The newly created job.
* @throws IOException When setting up the job fails.
*/
public static Job createSubmittableJob(Configuration conf, String[] args)
throws IOException {
String tableName = args[0];
Path inputDir = new Path(args[1]);
Job job = new Job(conf, NAME + "_" + tableName);
job.setJarByClass(TsvImporter.class);
FileInputFormat.setInputPaths(job, inputDir);
job.setInputFormatClass(TextInputFormat.class);
job.setMapperClass(TsvImporter.class);
String hfileOutPath = conf.get(BULK_OUTPUT_CONF_KEY);
if (hfileOutPath != null) {
HTable table = new HTable(conf, tableName);
job.setReducerClass(PutSortReducer.class);
Path outputDir = new Path(hfileOutPath);
FileOutputFormat.setOutputPath(job, outputDir);
job.setMapOutputKeyClass(ImmutableBytesWritable.class);
job.setMapOutputValueClass(Put.class);
HFileOutputFormat.configureIncrementalLoad(job, table);
} else {
// No reducers. Just write straight to table. Call initTableReducerJob
// to set up the TableOutputFormat.
TableMapReduceUtil.initTableReducerJob(tableName, null, job);
job.setNumReduceTasks(0);
}
TableMapReduceUtil.addDependencyJars(job);
TableMapReduceUtil.addDependencyJars(job.getConfiguration(),
com.google.common.base.Function.class /* Guava used by TsvParser */);
return job;
}
/*
* @param errorMsg Error message. Can be null.
*/
private static void usage(final String errorMsg) {
if (errorMsg != null && errorMsg.length() > 0) {
System.err.println("ERROR: " + errorMsg);
}
String usage =
"Usage: " + NAME + " -Dimporttsv.columns=a,b,c <tablename> <inputdir>\n" +
"\n" +
"Imports the given input directory of TSV data into the specified table.\n" +
"\n" +
"The column names of the TSV data must be specified using the -Dimporttsv.columns\n" +
"option. This option takes the form of comma-separated column names, where each\n" +
"column name is either a simple column family, or a columnfamily:qualifier. The special\n" +
"column name HBASE_ROW_KEY is used to designate that this column should be used\n" +
"as the row key for each imported record. You must specify exactly one column\n" +
"to be the row key.\n" +
"\n" +
"In order to prepare data for a bulk data load, pass the option:\n" +
" -D" + BULK_OUTPUT_CONF_KEY + "=/path/for/output\n" +
"\n" +
"Other options that may be specified with -D include:\n" +
" -D" + SKIP_LINES_CONF_KEY + "=false - fail if encountering an invalid line\n" +
" '-D" + SEPARATOR_CONF_KEY + "=|' - eg separate on pipes instead of tabs";
System.err.println(usage);
}
/**
* Main entry point.
*
* @param args The command line parameters.
* @throws Exception When running the job fails.
*/
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
if (otherArgs.length < 2) {
usage("Wrong number of arguments: " + otherArgs.length);
System.exit(-1);
}
// Make sure columns are specified
String columns[] = conf.getStrings(COLUMNS_CONF_KEY);
if (columns == null) {
usage("No columns specified. Please specify with -D" +
COLUMNS_CONF_KEY+"=...");
System.exit(-1);
}
// Make sure they specify exactly one column as the row key
int rowkeysFound=0;
for (String col : columns) {
if (col.equals(TsvParser.ROWKEY_COLUMN_SPEC)) rowkeysFound++;
}
if (rowkeysFound != 1) {
usage("Must specify exactly one column as " + TsvParser.ROWKEY_COLUMN_SPEC);
System.exit(-1);
}
// Make sure one or more columns are specified
if (columns.length < 2) {
usage("One or more columns in addition to the row key are required");
System.exit(-1);
}
Job job = createSubmittableJob(conf, otherArgs);
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}