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https://issues.apache.org/jira/browse/HADOOP-18691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HADOOP-18691:
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Fix Version/s: 3.4.0
> Add a CallerContext getter on the Schedulable interface
> -------------------------------------------------------
>
> Key: HADOOP-18691
> URL: https://issues.apache.org/jira/browse/HADOOP-18691
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Christos Bisias
> Assignee: Christos Bisias
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.6
>
>
> We would like to add a default *{color:#00875a}CallerContext{color}* getter
> on the *{color:#00875a}Schedulable{color}* interface
> {code:java}
> default public CallerContext getCallerContext() {
> return null;
> } {code}
> and then override it on the
> *{color:#00875a}i{color}{color:#00875a}{*}pc/{*}Server.Call{color}* class
> {code:java}
> @Override
> public CallerContext getCallerContext() {
> return this.callerContext;
> } {code}
> to expose the already existing *{color:#00875a}callerContext{color}* field.
>
> This change will help us access the *{color:#00875a}CallerContext{color}* on
> an Apache Ozone *{color:#00875a}IdentityProvider{color}* implementation.
> On Ozone side the *{color:#00875a}FairCallQueue{color}* doesn't work with the
> Ozone S3G, because all users are masked under a special S3G user and there is
> no impersonation. Therefore, the FCQ reads only 1 user and becomes
> ineffective. We can use the *{color:#00875a}CallerContext{color}* field to
> store the current user and access it on the Ozone
> {*}{color:#00875a}IdentityProvider{color}{*}.
>
> This is a presentation with the proposed approach.
> [https://docs.google.com/presentation/d/1iChpCz_qf-LXiPyvotpOGiZ31yEUyxAdU4RhWMKo0c0/edit#slide=id.p]
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