Java 获取工具界面警告，即使已实现

我有一个非常简单的“Hello world”样式的映射/缩减作业

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);
    }

我可以验证没有添加配置

有人知道为什么Hadoop认为ToolRunner没有实现吗

$hadoop版本 Hadoop 2.4.0.2.1.2.0-402

钟表厂

谢谢，

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克里斯

当你的问题快速出现在谷歌搜索此警告的顶部时，我会在这里给出正确的答案：

正如用户1797538您所说的：（对此表示抱歉）

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user1797538：“问题是调用获取作业实例”

必须使用配置的超类。顾名思义，它已经配置好了，因此Tester类必须使用现有的配置，而不是设置一个新的空配置

如果我们用一种方法提取创造的就业机会：

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;
}

javadoc中的另一个示例：

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Javadoc:

问题是调用作业实例，应该是。。。Job.getInstance（getConf（））；我在运行HiveQL脚本的Hive Beeline中遇到了类似的问题

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;
}