/**
* 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 org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.util.Base64;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Counter;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import java.io.IOException;
/**
* Write table content out to files in hdfs.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class TsvImporterMapper
extends Mapper<LongWritable, Text, ImmutableBytesWritable, Put>
{
/** Timestamp for all inserted rows */
private long ts;
/** Column seperator */
private String separator;
/** Should skip bad lines */
private boolean skipBadLines;
private Counter badLineCount;
private ImportTsv.TsvParser parser;
public long getTs() {
return ts;
}
public boolean getSkipBadLines() {
return skipBadLines;
}
public Counter getBadLineCount() {
return badLineCount;
}
public void incrementBadLineCount(int count) {
this.badLineCount.increment(count);
}
/**
* Handles initializing this class with objects specific to it (i.e., the parser).
* Common initialization that might be leveraged by a subsclass is done in
* <code>doSetup</code>. Hence a subclass may choose to override this method
* and call <code>doSetup</code> as well before handling it's own custom params.
*
* @param context
*/
@Override
protected void setup(Context context) {
doSetup(context);
Configuration conf = context.getConfiguration();
parser = new ImportTsv.TsvParser(conf.get(ImportTsv.COLUMNS_CONF_KEY),
separator);
if (parser.getRowKeyColumnIndex() == -1) {
throw new RuntimeException("No row key column specified");
}
}
/**
* Handles common parameter initialization that a subclass might want to leverage.
* @param context
*/
protected void doSetup(Context context) {
Configuration conf = context.getConfiguration();
// If a custom separator has been used,
// decode it back from Base64 encoding.
separator = conf.get(ImportTsv.SEPARATOR_CONF_KEY);
if (separator == null) {
separator = ImportTsv.DEFAULT_SEPARATOR;
} else {
separator = new String(Base64.decode(separator));
}
// Should never get 0 as we are setting this to a valid value in job
// configuration.
ts = conf.getLong(ImportTsv.TIMESTAMP_CONF_KEY, 0);
skipBadLines = context.getConfiguration().getBoolean(
ImportTsv.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 {
ImportTsv.TsvParser.ParsedLine parsed = parser.parse(
lineBytes, value.getLength());
ImmutableBytesWritable rowKey =
new ImmutableBytesWritable(lineBytes,
parsed.getRowKeyOffset(),
parsed.getRowKeyLength());
// Retrieve timestamp if exists
ts = parsed.getTimestamp(ts);
Put put = new Put(rowKey.copyBytes());
for (int i = 0; i < parsed.getColumnCount(); i++) {
if (i == parser.getRowKeyColumnIndex()
|| i == parser.getTimestampKeyColumnIndex()) {
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 (ImportTsv.TsvParser.BadTsvLineException badLine) {
if (skipBadLines) {
System.err.println(
"Bad line at offset: " + offset.get() + ":\n" +
badLine.getMessage());
incrementBadLineCount(1);
return;
} else {
throw new IOException(badLine);
}
} catch (IllegalArgumentException e) {
if (skipBadLines) {
System.err.println(
"Bad line at offset: " + offset.get() + ":\n" +
e.getMessage());
incrementBadLineCount(1);
return;
} else {
throw new IOException(e);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}