Question

我正在使用AWS并尝试使用hue create oozie workflow for map only job。我拿了mapreduce action。尝试了很多方法后，我无法完成它。我从CLI运行我的工作，它工作正常。

我在HDFS中创建了一个dir名称mapreduce目录，并将我的driver.java和mapper.java放入其中。在mapreduce目录下，我创建了lib目录并将runnable jar放入其中。我附上了色调界面的屏幕截图。

我遗失了某些东西，或者似乎我无法将runnable jar放在适当的位置。

我还想在Hue的输入和输出目录中添加一个额外的参数。我怎么能这样做？

我的疑问在于

2015-11-06 14:56:57,679 WARN [main] org.apache.hadoop.mapreduce.JobSubmitter: No job jar file set. User classes may not be found. See Job or Job#setJar(String).

当我试图看oozie时：行动日志。我收到了以下信息。

No tasks found for job job_1446129655727_0306.

更新1

import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.io.*;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

/*
 * Driver class to decompress the zip files.
 */
public class DecompressJob extends Configured implements Tool {

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

    public int run(String[] args) throws Exception {

        Configuration conf = new Configuration();
        conf.set("unzip_files", args[2]);

        Job JobConf = Job.getInstance(conf);
        JobConf.setJobName("mapper class");

        try {
            FileSystem fs = FileSystem.get(getConf());
            if (fs.isDirectory(new Path(args[1]))) {
                fs.delete(new Path(args[1]), true);
            }
        } catch (Exception e) {
        }


        JobConf.setJarByClass(DecompressJob.class);
        JobConf.setOutputKeyClass(LongWritable.class);
        JobConf.setOutputValueClass(Text.class);

        JobConf.setMapperClass(DecompressMapper.class);
        JobConf.setNumReduceTasks(0);
        Path input = new Path(args[0]);
        Path output = new Path(args[1]);

        FileInputFormat.addInputPath(JobConf, input);
        FileOutputFormat.setOutputPath(JobConf, output);

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

我还更新了屏幕截图，添加了更多属性。发布错误日志

2015-11-07 02:43:31,074 INFO [main] org.apache.hadoop.mapred.Task:  Using ResourceCalculatorProcessTree : [ ]
  2015-11-07 02:43:31,110 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running child : java.lang.RuntimeException: java.lang.ClassNotFoundException: Class /user/Ajay/rad_unzip/DecompressMapper.class not found
  at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2074)
  at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
  at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:751)
  at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)
  at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:171)
  at java.security.AccessController.doPrivileged(Native Method)
  at javax.security.auth.Subject.doAs(Subject.java:415)
  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
  at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:166)
  Caused by: java.lang.ClassNotFoundException: Class /user/uname/out/DecompressMapper.class not found
  at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1980)
  at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2072)
  ... 8 more

  2015-11-07 02:43:31,114 INFO [main] org.apache.hadoop.mapred.Task: Runnning cleanup for the task
  2015-11-07 02:43:31,125 WARN [main] org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter: Could not delete hdfs://uname/out/output/_temporary/1/_temporary/attempt_1446129655727_0336_m_000001_1

Answer 1

你应该将你的dirver和mapper捆绑在同一个jar中。要传递新参数，可以直接单击“添加属性”并提供随机属性名和属性值。在您的MR程序中，您可以使用“getConf（）。get（”propertyName“）”方法获取值。

使用Hue的MapReduce oozie工作流程

更新1

1 个答案: