Hadoop 2.0 计数器

hadoop1.x里面用于统计的计数器是Reporter累，在2.x中统一用Context类，此时需要调用下面的API进行统计：

例子：

public class test extends Configured implements Tool {
	
	enum BadRecord{
		BAD_UNIQUEID,
		BAD_WIDTH,
		BAD_HEIGHT,
		BAD_PV
	};

	public static class mapper extends Mapper<LongWritable, Text, DoubleWritable, Text> {
		@Override
		protected void setup(Context context) throws IOException,InterruptedException {
			super.setup(context);
		}
		
		public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
			parser.parse(value);
			
			boolean bvUniqueId = parser.isValidUniqueId();
			boolean bvWidth = parser.isValidWidth();
			boolean bvHeight = parser.isValidHeight();
			
			if(bvUniqueId && bvWidth && bvHeight){
				context.write(new DoubleWritable(getAreaFeature(parser.getWidth(), parser.getHeight())), 
						new Text("" + parser.getUrl() + " " +parser.getWidth()+" "+parser.getHeight()));
			}else if(!bvWidth){
				context.getCounter(BadRecord.BAD_WIDTH).increment(1);
			}else if(!bvHeight){
				context.getCounter(BadRecord.BAD_HEIGHT).increment(1);
			}else if(!bvUniqueId){
				context.getCounter(BadRecord.BAD_UNIQUEID).increment(1);
			}
		}		
	}

}