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https://issues.apache.org/jira/browse/MAPREDUCE-5898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008896#comment-14008896
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Yi Liu commented on MAPREDUCE-5898:
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As we know, xattrs can be stored in 4 namespaces: user, trusted, security and
system.
{{user}} and {{trusted}} namespaces xattr are available to user, but
{{security}} and {{system}} namespaces xattr are only for HDFS core.
Initial thought is distcp supports preserving {{user}} and {{trusted}}
namespaces xattr; for {{security}} and {{system}} namespaces, they should be
managed by target FS through pre-configuration.
For example, in HDFS transparent encryption, {{security}} namespace xattrs are
used. To copy encryption dir from src HDFS to target HDFS, user needs to create
the encryption zone in target HDFS firstly, then data written to the encryption
dir of target HDFS will be encrypted automatically.
Agree with [~andrew.wang] to use new option flag "-px" of distcp for "preserve
XAttrs".
> distcp to support preserving HDFS extended attributes(XAttrs)
> -------------------------------------------------------------
>
> Key: MAPREDUCE-5898
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5898
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distcp
> Affects Versions: 3.0.0
> Reporter: Uma Maheswara Rao G
> Assignee: Yi Liu
>
> This JIRA to track the distcp support to handle the Xattrs with preserving
> options.
> Add new command line argument to support that.
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