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https://issues.apache.org/jira/browse/HDFS-6152?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yongjun Zhang updated HDFS-6152:
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Attachment: HDFS-6152.001.patch
> distcp V2 doesn't preserve root dir's attributes when -p is specified
> ---------------------------------------------------------------------
>
> Key: HDFS-6152
> URL: https://issues.apache.org/jira/browse/HDFS-6152
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.3.0
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Attachments: HDFS-6152.001.patch
>
>
> Two issues were observed with distcpV2
> ISSUE 1. when copying a source dir to target dir with "-pu" option using
> command
> "distcp -pu source-dir target-dir"
>
> The source dir's owner is not preserved at target dir. Simiarly other
> attributes of source dir are not preserved. Supposedly they should be
> preserved when no -update and no -overwrite specified.
> There are two scenarios with the above command:
> a. when target-dir already exists. Issuing the above command will result in
> target-dir/source-dir (source-dir here refers to the last component of the
> source-dir path in the command line) at target file system, with all contents
> in source-dir copied to under target-dir/src-dir. The issue in this case is,
> the attributes of src-dir is not preserved.
> b. when target-dir doesn't exist. It will result in target-dir with all
> contents of source-dir copied to under target-dir. This issue in this case
> is, the attributes of source-dir is not carried over to target-dir.
> For multiple source cases, e.g., command
> "distcp -pu source-dir1 source-dir2 target-dir"
> No matter whether the target-dir exists or not, the multiple sources are
> copied to under the target dir (target-dir is created if it didn't exist).
> And their attributes are preserved.
> ISSUE 2. with the following command:
> distcp source-dir target-dir
> when source-dir is an empty directory, and when target-dir doesn't exist,
> source-dir is not copied, actually the command behaves like a no-op.
> However, when the source-dir is not empty, it would be copied and results in
> target-dir at the target file system containing a copy of source-dir's
> children.
> To be consistent, empty source dir should be copied too. Basically the above
> distcp command should cause target-dir get created at target file
> system, and the source-dir's attributes are preserved at target-dir when
> -p is passed.
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