即使实现了工具界面警告也是如此

Question

我有一个非常简单的"Hello world"风格地图/减少工作.

public class Tester extends Configured implements Tool {

    @Override
    public int run(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.printf("Usage: %s [generic options] <input> <output>\n",
                getClass().getSimpleName());
            ToolRunner.printGenericCommandUsage(System.err);
            return -1;
        }

        Job job = Job.getInstance(new Configuration());
        job.setJarByClass(getClass());


        getConf().set("mapreduce.job.queuename", "adhoc");

        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(NullWritable.class);
        job.setMapperClass(TesterMapper.class);
        job.setNumReduceTasks(0);

        return job.waitForCompletion(true) ? 0 : 1;
    }

    public static void main(String[] args) throws Exception {
        int exitCode = ToolRunner.run(new Tester(), args);
        System.exit(exitCode);
    }

它实现了ToolRunner,但是在运行时没有解析参数.

$hadoop jar target/manifold-mapreduce-0.1.0.jar ga.manifold.mapreduce.Tester -conf conf.xml etl/manifold/pipeline/ABV1T/ingest/input etl/manifold/pipeline/ABV1T/ingest/output
15/02/04 16:35:24 INFO client.RMProxy: Connecting to ResourceManager at lxjh116-pvt.phibred.com/10.56.100.23:8050
15/02/04 16:35:25 WARN mapreduce.JobSubmitter: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.

我可以验证是否未添加配置.

任何人都知道为什么Hadoop认为ToolRunner没有实现？

$ hadoop版本Hadoop 2.4.0.2.1.2.0-402

Hortonworks

谢谢,克里斯

Answer 1

由于您的问题在Google搜索此警告的顶部非常快,我将在此给出正确答案:

如 user1797538 你说:( 抱歉)

user1797538:"问题是获取Job实例的调用"

必须使用超类Configured.顾名思义,它已经配置好了,因此现有的配置必须由Tester类使用,而不是设置新的空配置.

如果我们在方法中提取作业创建:

private Job createJob() throws IOException {

    // On this line use getConf() instead of new Configuration()
    Job job = Job.getInstance(getConf(), Tester.class.getCanonicalName());

    // Other job setter call here, for example
    job.setJarByClass(Tester.class);
    job.setMapperClass(TesterMapper.class);
    job.setCombinerClass(TesterReducer.class);
    job.setReducerClass(TesterReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    // adapt this to your needs of course.

    return job;
}

另一个来自javadoc的例子:org.apache.hadoop.util.Tool

和Javadoc:Configured.getConf()