Yongjun Zhang updated HDFS-12295:
    Attachment: HDFS-12295.001.patch

A very draft patch to illustrate the idea.

> NameNode to support file path prefix /.reserved/bypassExtAttr
> -------------------------------------------------------------
>                 Key: HDFS-12295
>                 URL: https://issues.apache.org/jira/browse/HDFS-12295
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs, namenode
>            Reporter: Yongjun Zhang
>            Assignee: Yongjun Zhang
>         Attachments: HDFS-12295.001.patch
> Let NameNode to support prefix /.reserved/bypassExtAttr, so client can add 
> thisprefix to a path before calling getFileStatus, e.g. /ab/c becomes 
> /.reserved/bypassExtAttr/a/b/c. NN will parse the path at the very beginning, 
> and bypass external attribute provider if the prefix is there.

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