use counter to statistics file row number

[lei liu]

I use counter to statistics  file row number in Mapper, example below code:

public void map(LongWritable key, Text value,
            OutputCollector<Text, IntWritable> output, Reporter reporter)
            throws IOException {

        try {

            reporter.incrCounter("row", "num", 1);

        } catch (Throwable e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

Could everyone tell me whether there are any risks do so？


Thanks，

LiuLei