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From "Sreekanth Ramakrishnan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5396) Queue ACLs should be refreshed without requiring a restart of the job tracker
Date Wed, 11 Mar 2009 11:29:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680844#action_12680844
] 

Sreekanth Ramakrishnan commented on HADOOP-5396:
------------------------------------------------

I think there was a discussion related to this issue for schedulers to be allowed to re-read
the configuration it was discussed on [HADOOP-4522|https://issues.apache.org/jira/browse/HADOOP-5396],
there is a patch also out there which actually implements the mradmin which refreshes the
configuration. We should take a look at that.

In my opinion,adding a seperate configuration file for queue acl's would increase administrators
burden to deal with one extra file for getting something done, we should avoid it if required..
Best way should be to add {{Configuration.reload(String key)}} that way we can re-read the
conf file and then add/update the appropriate key. 

> Queue ACLs should be refreshed without requiring a restart of the job tracker
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-5396
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5396
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Hemanth Yamijala
>            Assignee: Vinod K V
>
> In large shared deployments of the M/R clusters, it is normal that new users will periodically
want to get access to some queues on the M/R framework. Requiring a JT restart for each such
change is operationally inconvenient and seems an overkill. There should be a way for updating
ACLs with new users without requiring a JT restart.

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