Work on HIVE-17289 started by Sankar Hariappan.
> IMPORT should copy files without using doAs user.
> -------------------------------------------------
>                 Key: HIVE-17289
>                 URL: https://issues.apache.org/jira/browse/HIVE-17289
>             Project: Hive
>          Issue Type: Sub-task
>          Components: HiveServer2, repl
>    Affects Versions: 3.0.0
>            Reporter: Sankar Hariappan
>            Assignee: Sankar Hariappan
>              Labels: DR, Import, replication
>             Fix For: 3.0.0
> Currently, IMPORT uses distcp to copy the larger files/large number of files 
> from dump directory to table staging directory. But, this copy fails as 
> distcp is always done with doAs user specified in 
> hive.distcp.privileged.doAs, which is "hdfs' by default.
> Need to remove usage of doAs user when try to distcp from IMPORT flow.
> Also, need to set the default config for hive.distcp.privileged.doAs to 
> "hive" as "hdfs" super-user is never allowed.

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