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问题描述
我有一个有循环的Hadoop程序。在循环的每次迭代中创建一个作业。如何在代码中找到作业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
当您提交作业>实例，您可以使用 getJobID 方法获取有关作业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，在0.20.204之前影响Hadoop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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