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https://issues.apache.org/jira/browse/HADOOP-8561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408393#comment-13408393
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Luke Lu commented on HADOOP-8561:
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@Owen, I'm fine with repurposing HADOOP_USER_NAME and for proxy user (better
auditing and access control even without kerbero), though it's an incompatible
change. One of the reasons we added HADOOP_PROXY_USER is to preserve the
original semantics for HADOOP_USER_NAME.
> Introduce HADOOP_PROXY_USER for secure impersonation in child hadoop client
> processes
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-8561
> URL: https://issues.apache.org/jira/browse/HADOOP-8561
> Project: Hadoop Common
> Issue Type: Improvement
> Components: security
> Reporter: Luke Lu
> Assignee: Yu Gao
>
> To solve the problem for an authenticated user to type hadoop shell commands
> in a web console, we can introduce an HADOOP_PROXY_USER environment variable
> to allow proper impersonation in the child hadoop client processes.
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