Hadoop Mapper 阶段将数据直接从 HDFS 导入 Hbase

数据源格式如下：

20130512    1   -1  -1  13802   1   2013-05-12 07:26:22
20130512    1   -1  -1  13802   1   2013-05-12 11:18:24

我们期待的结果是数据直接从 hdfs 读取后 写入 hbase，没有 reduce 阶段，

代码如下：

package WebsiteAnalysis;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.TableOutputFormat;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.util.GenericOptionsParser;

public class Map2Hdfs {
public static final String NAME = "ImportFromFile";

public enum Counters {
LINES
}

static class ImportMapper extends Mapper<LongWritable, Text, ImmutableBytesWritable, Writable> {
private byte[] family = null;
private byte[] qualifier = null;

@Override
protected void setup(Context context) throws IOException, InterruptedException {
String column = context.getConfiguration().get("conf.column");
byte[][] colkey = KeyValue.parseColumn(Bytes.toBytes(column));
family = colkey[0];
if (colkey.length > 1) {
qualifier = colkey[1];
}
}

@Override
public void map(LongWritable offset, Text line, Context context) throws IOException {
try {
String[] lineArr = line.toString().split("\t");
Put put = new Put(Bytes.toBytes(offset + ""));
put.add(family, Bytes.toBytes("time"), Bytes.toBytes(lineArr[lineArr.length - 1]));
context.write(new ImmutableBytesWritable(Bytes.toBytes(offset + "")), put);
context.getCounter(Counters.LINES).increment(1);
} catch (Exception e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
conf.set("conf.column", "cf");
String inputPath = "/dsap/middata/lj/ooxx/pv";
Job job = new Job(conf, "TestMap2Hdfs");

job.setJarByClass(Map2Hdfs.class);
job.setMapperClass(ImportMapper.class);
job.setOutputFormatClass(TableOutputFormat.class);
job.getConfiguration().set(TableOutputFormat.OUTPUT_TABLE, "TestMap2Hdfs");
job.setOutputKeyClass(ImmutableBytesWritable.class);
job.setOutputValueClass(Writable.class);
job.setNumReduceTasks(0);
FileInputFormat.addInputPath(job, new Path(inputPath + "/" + otherArgs[0]));

3ff0
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}

REF：

http://stackoverflow.com/questions/11061854/hadoop-writing-to-hbase-directly-from-the-mapper
http://blog.sina.com.cn/s/blog_62a9902f0101904h.html 新建表的方式写入
hbase-hdfs MapReduce 数据读写总结
http://blog.pureisle.net/archives/1938.html hbase hdfs MR 读写的几种情况总结
http://blog.csdn.net/kirayuan/article/details/7001278 hbase表拷贝样例代码