Hadoop找到任务尝试的主机名 [英] Hadoop find hostname of task attempt

问题描述

我试图以编程方式确定在将映射减少作业提交到hadoop时，哪些任务尝试在我的集群中的哪个任务跟踪器上运行。我发现我可以从JobClient获得大部分任务数据，如下所示：

jobClient.getMapTaskReports（jobID）

但不是任务尝试成功的机器的主机名。是否有人知道如何从任务尝试ID中获取主机名？

JobClient 给你一个所谓的 NetworkedJob 时提交。它有一个名为 getTaskCompletionEvents 的方法。

返回一个 TaskCompletionEvent 发生了那些包含执行任务的tasktracker的HTTP地址。

从这一点开始，您可以解析主机网址。

I am trying to programatically determine which task attempts run on which tasktracker in my cluster when submitting map reduce jobs to hadoop. I have found that I can get most of the task data from the JobClient like so:

jobClient.getMapTaskReports(jobID)

but not the hostname of the machine that a task attempt succeeded on. Does anybody know how to get the hostname from the task attempt id?

解决方案

The JobClient gives you a so called NetworkedJob when submitting. It has a method called getTaskCompletionEvents.

That returns you an array of TaskCompletionEvent that happened, those contain the HTTP address of the tasktracker that ran a task.

From that point you can parse the host from the URL.

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