[jira] [Assigned] (HDFS-6152) distcp V2 doesn't preserve root dir's attributes when -p is specified

["Yongjun Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-6152?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yongjun Zhang reassigned HDFS-6152:
-----------------------------------

    Assignee: Yongjun Zhang

> 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
>
> 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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