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https://issues.apache.org/jira/browse/HADOOP-10280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945834#comment-13945834
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Chris Li commented on HADOOP-10280:
-----------------------------------
Hi Arapit, I think the closest example of how to use the IdentityProvider and
Schedulable is in the test cases.
As far as why we need this capability, qos requires us to extract some
identity, usually username. This patch allows that as well as more general
classification of Calls.
Thanks,
Chris
> Make Schedulables return a configurable identity of user or group
> -----------------------------------------------------------------
>
> Key: HADOOP-10280
> URL: https://issues.apache.org/jira/browse/HADOOP-10280
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Chris Li
> Assignee: Chris Li
> Attachments: HADOOP-10280.patch, HADOOP-10280.patch,
> HADOOP-10280.patch, HADOOP-10280.patch
>
>
> In order to intelligently schedule incoming calls, we need to know what
> identity it falls under.
> We do this by defining the Schedulable interface, which has one method,
> getIdentity(IdentityType idType)
> The scheduler can then query a Schedulable object for its identity, depending
> on what idType is.
> For example:
> Call 1: Made by user=Alice, group=admins
> Call 2: Made by user=Bob, group=admins
> Call 3: Made by user=Carlos, group=users
> Call 4: Made by user=Alice, group=admins
> Depending on what the identity is, we would treat these requests differently.
> If we query on Username, we can bucket these 4 requests into 3 sets for
> Alice, Bob, and Carlos. If we query on Groupname, we can bucket these 4
> requests into 2 sets for admins and users.
> In this initial version, idType can be username or primary group. In future
> versions, it could be jobID, request class (read or write), or some explicit
> QoS field. These are user-defined, and will be reloaded on callqueue refresh.
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