480      阿裏雲  技術社區[雲棲]

重讀avro文件 對文件進行簡單的mr計算

public class ReadAvroInput {

public static class ReadAvroInputMap extends Mapper<AvroKey<UserActionLog>, NullWritable, Text, IntWritable> {

    private Text oKey = new Text();
    private final IntWritable ONE = new IntWritable(1);
    private UserActionLog keyData;

    @Override
    protected void map(AvroKey<UserActionLog> key, NullWritable value,
            Mapper<AvroKey<UserActionLog>, NullWritable, Text, IntWritable>.Context context)
            throws IOException, InterruptedException {
        keyData = key.datum();
        oKey.set(keyData.getProvience().toString());
        context.write(oKey, ONE);
    }
}

public static class ReadAvroInputReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
    private int sum;
    private IntWritable oValue = new IntWritable();

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values,
            Reducer<Text, IntWritable, Text, IntWritable>.Context context)
            throws IOException, InterruptedException {
        sum=0;
        for (IntWritable value : values) {
            sum += value.get();
        }
        oValue.set(sum);
        context.write(key, oValue);

    }
}

public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
    Configuration configuration =new Configuration();
    Job job =Job.getInstance(configuration);
    job.setJarByClass(ReadAvroInput.class);
    job.setJobName("重讀avro文件進行mr計算");

    job.setMapperClass(ReadAvroInputMap.class);
    job.setCombinerClass(ReadAvroInputReducer.class);
    job.setReducerClass(ReadAvroInputReducer.class);

    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    job.setInputFormatClass(AvroKeyInputFormat.class);
    AvroJob.setInputKeySchema(job, UserActionLog.getClassSchema());

    FileInputFormat.addInputPath(job, new Path("/ReducerJoin/part-r-00000.avro"));
    Path outputPath =new Path("/ReadAvroInput");
    outputPath.getFileSystem(configuration).delete(outputPath, true);
    FileOutputFormat.setOutputPath(job, outputPath);
    System.exit(job.waitForCompletion(true)?0:1);
}

}

UserActionLog是通過mvn 指令通過schema框架生成的

最後更新：2017-10-20 09:33:24

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