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https://issues.apache.org/jira/browse/HDFS-12294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126494#comment-16126494
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Chris Douglas commented on HDFS-12294:
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[~yzhangal], can you be more specific about the requirements? Perhaps provide
an example?
(repeating some comments from HDFS-12202) If the external provider only adds
attributes, perhaps this could be implemented as a filter in distcp. If the
external provider also removes attributes, then perhaps the external attribute
provider can be configured to return the original FileStatus attributes given
some rules (e.g., backup user).
> Let distcp to bypass external attribute provider when calling getFileStatus
> etc at source cluster
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-12294
> URL: https://issues.apache.org/jira/browse/HDFS-12294
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
>
> This is an alternative solution for HDFS-12202, which proposed introducing a
> new set of API, with an additional boolean parameter bypassExtAttrProvider,
> so to let NN bypass external attribute provider when getFileStatus. The goal
> is to avoid distcp from copying attributes from one cluster's external
> attribute provider and save to another cluster's fsimage.
> The solution here is, instead of having an additional parameter, encode this
> parameter to the path itself, when calling getFileStatus (and some other
> calls), NN will parse the path, and figure out that whether external
> attribute provider need to be bypassed. The suggested encoding is to have a
> prefix to the path before calling getFileStatus, e.g. /ab/c becomes
> /.reserved/bypassExtAttr/a/b/c. NN will parse the path at the very beginning.
> Thanks much to [~andrew.wang] for this suggestion. The scope of change is
> smaller and we don't have to change the FileSystem APIs.
>
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