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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2266) Provide a command line option to check if a Hadoop jobtracker is idle
Date Wed, 28 Nov 2007 17:57:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546320

Arun C Murthy commented on HADOOP-2266:

Let me clarify, I agree 'graceful shutdown' initiated by the JT is the _right_ solution. 

However, the command, as described here, is a good interim solution IMHO.

> Provide a command line option to check if a Hadoop jobtracker is idle
> ---------------------------------------------------------------------
>                 Key: HADOOP-2266
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2266
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Hemanth Yamijala
>             Fix For: 0.16.0
> This is an RFE for providing a way to determine from the hadoop command line whether
a jobtracker is idle. One possibility is to have something like hadoop jobtracker -idle <time>.
Hadoop would return true (maybe via some stdout output) if the jobtracker had no work to do
(jobs running / prepared) since <time> seconds, false otherwise.
> This would be useful for management / provisioning systems like Hadoop-On-Demand [HADOOP-1301],
which can then deallocate the idle, provisioned clusters automatically, and release resources.

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