如何在代码中找到 hadoop 工作的工作 ID? [英] How to find job Id of a hadoop job in code?

问题描述

我有一个 Hadoop 程序，它有一个循环.在循环的每次迭代中，都会创建一个作业.如何在代码中找到工作 ID?

I have a Hadoop program which has a loop. In each iteration of the loop a job is created. How can I find the job id in the code?

推荐答案

当你提交你的 Job 实例时，你可以使用 getJobID 方法获取关于 job id 的信息:

When you submit your Job instance, you can get information about the job id using the getJobID method:

Configuration config = new Configuration();
Job job = new Job(config);
// configure your job
job.submit();
// at that point your job is submitted but not finished and should have your job id
String jobid = job.getJobID().toString();

请注意，MAPREDUCE-118 中描述了一个影响 Hadoop 的错误0.20.204 之前的版本，其中 getJobID 只会返回 null.

Note that there was a bug described in MAPREDUCE-118 which impacted Hadoop versions before 0.20.204 where getJobID would only return null.

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