/*
* Copyright 2012 NGDATA nv
*
* Licensed 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.lilyproject.repository.bulk.mapreduce;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.lilyproject.repository.bulk.BulkIngester;
import org.lilyproject.repository.bulk.LineMapper;
import org.lilyproject.repository.bulk.LineMappingContext;
import org.lilyproject.repository.bulk.jython.JythonLineMapper;
/**
* Text line MapReduce mapper that sends input lines to a user-defined mapping function implemented in Python.
*/
public class LilyJythonMapper extends Mapper<LongWritable, Text, ImmutableBytesWritable, Put> {
/**
* Config key for the mapper symbol name.
*/
public static final String MAPPER_SYMBOL_NAME = "lilyproject.jython.mapper.symbol";
/**
* Config key for the mapper Jython code.
*/
public static final String MAPPER_CODE = "lilyproject.jython.mapper.code";
/**
* Config key for Lily ZooKeeper connection string.
*/
public static final String LILY_ZK_STRING = "lilyproject.zookeeper.connection";
/**
* Config key for the name of the repository table to write to.
*/
public static final String TABLE_NAME = "lilyproject.tablename";
/**
* Config key for the name of the repository to write to.
*/
public static final String REPOSITORY_NAME = "lilyproject.repositoryname";
/**
* Config key to configure bulk mode.
*/
public static final String BULK_MODE = "lilyproject.bulk";
private LineMapper lineMapper;
private BulkIngester bulkIngester;
private LineMappingContext lineMappingContext;
private MapReduceRecordWriter recordWriter;
@Override
protected void setup(Context context) throws IOException, InterruptedException {
Configuration conf = context.getConfiguration();
lineMapper = new JythonLineMapper(conf.get(MAPPER_CODE), conf.get(MAPPER_SYMBOL_NAME));
bulkIngester = BulkIngester.newBulkIngester(conf.get(LILY_ZK_STRING), 30000, conf.get(REPOSITORY_NAME),
conf.get(TABLE_NAME), Boolean.valueOf(conf.get(BULK_MODE)));
recordWriter = new MapReduceRecordWriter(bulkIngester);
lineMappingContext = new LineMappingContext(bulkIngester, recordWriter);
}
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
long preRecordsWritten = recordWriter.getNumRecords();
recordWriter.setContext(context);
lineMapper.mapLine(value.toString(), lineMappingContext);
long numWritten = recordWriter.getNumRecords() - preRecordsWritten;
updateCounters(context, numWritten);
}
private void updateCounters(Context context, long numWritten) {
if (numWritten > 0) {
if (numWritten == 1) {
context.getCounter(BulkImportCounters.INPUT_LINES_WITH_ONE_OUTPUT_RECORD).increment(1L);
} else {
context.getCounter(BulkImportCounters.INPUT_LINES_WITH_MULTIPLE_OUTPUT_RECORDS).increment(1L);
}
context.getCounter(BulkImportCounters.OUTPUT_LILY_RECORDS).increment(numWritten);
} else {
context.getCounter(BulkImportCounters.INPUT_LINES_WITH_NO_OUTPUT).increment(1L);
}
}
@Override
protected void cleanup(Context context) throws IOException, InterruptedException {
bulkIngester.close();
}
}