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https://issues.apache.org/jira/browse/HADOOP-5396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681728#action_12681728
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Vinod K V commented on HADOOP-5396:
-----------------------------------
Going into the details:
- JT implements a AdminOperationsProtocol which will encompass all admin
related RPCs. Currently it only has a refreshQueues RPC.
RefreshAuthoroziationPolicy cannot be used for this as it is a public interface
that serves an independant purpose and used both in JT as well as NN.
{code}
public class jobTracker implements AdminOperationsProtocol ... {
.....
.....
public void refreshQueues() {
// reload the mapred-queues.xml
}
}
{code}
- Adding another option to MRAdmin to refresh queue properties.
- Moving mapred.queue.names, mapred.acls, all queue acl related properties
moved to mapred-queues.xml
One issue with the above: We want the AdminOperationsProtocol to be a package
private interface so that it can evolve over time. But MRAdmin is in
mapred.tools subpackage and so cannot access this protocl unless it is is
public. One way to resolve this is by moving MRAdmin tool into the mapred
package and deprecating the current mapred.tools.MRAdmin. Thoughts?
> 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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