package hbase;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.mapreduce.TableOutputFormat;
import org.apache.hadoop.hbase.mapreduce.TableReducer;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
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;

public class BatchImport {
    static class BatchImportMapper extends Mapper<LongWritable, Text, LongWritable, Text>{
        SimpleDateFormat dateformat1=new SimpleDateFormat("yyyyMMddHHmmss");
        Text v2 = new Text();
        
        protected void map(LongWritable key, Text value, Context context) throws java.io.IOException ,InterruptedException {
            final String[] splited = value.toString().split("\t");
            try {
                final Date date = new Date(Long.parseLong(splited[0].trim()));
                final String dateFormat = dateformat1.format(date);
                String rowKey = splited[1]+":"+dateFormat;
                v2.set(rowKey+"\t"+value.toString());
                context.write(key, v2);
            } catch (NumberFormatException e) {
                final Counter counter = context.getCounter("BatchImport", "ErrorFormat");
                counter.increment(1L);
                System.out.println("出錯了"+splited[0]+" "+e.getMessage());
            }
        };
    }
    
    static class BatchImportReducer extends TableReducer<LongWritable, Text, NullWritable>{
        protected void reduce(LongWritable key, java.lang.Iterable<Text> values,     Context context) throws java.io.IOException ,InterruptedException {
            for (Text text : values) {
                final String[] splited = text.toString().split("\t");
                
                final Put put = new Put(Bytes.toBytes(splited[0]));
                put.add(Bytes.toBytes("cf"), Bytes.toBytes("date"), Bytes.toBytes(splited[1]));
                put.add(Bytes.toBytes("cf"), Bytes.toBytes("msisdn"), Bytes.toBytes(splited[2]));
                //省略其他欄位，呼叫put.add(....)即可
                context.write(NullWritable.get(), put);
            }
        };
    }
    
    public static void main(String[] args) throws Exception {
        final Configuration configuration = new Configuration();
        //設定zookeeper
        configuration.set("hbase.zookeeper.quorum", "hadoop0");
        //設定hbase表名稱
        configuration.set(TableOutputFormat.OUTPUT_TABLE, "wlan_log");
        //將該值改大，防止hbase超時退出
        configuration.set("dfs.socket.timeout", "180000");
        
        final Job job = new Job(configuration, "HBaseBatchImport");
        
        job.setMapperClass(BatchImportMapper.class);
        job.setReducerClass(BatchImportReducer.class);
        //設定map的輸出，不設定reduce的輸出型別
        job.setMapOutputKeyClass(LongWritable.class);
        job.setMapOutputValueClass(Text.class);
        
        job.setInputFormatClass(TextInputFormat.class);
        //不再設定輸出路徑，而是設定輸出格式型別
        job.setOutputFormatClass(TableOutputFormat.class);
        
        FileInputFormat.setInputPaths(job, "hdfs://hadoop0:9000/input");
        
        job.waitForCompletion(true);
    }
}