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From "Chen Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12572) Ozone: OzoneFileSystem: delete/list status/rename/mkdir APIs
Date Thu, 05 Oct 2017 21:33:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193760#comment-16193760

Chen Liang commented on HDFS-12572:

Thanks [~msingh] for updating the patch! v004 patch looks good to me overall, some comments


1. Looks like in the rename, it is after all subdirectories and files are renamed, the src
path gets removed? Seems this means the rename can potentially generates doubled size of entries
of the directory being renamed. Would it be better (if possible) to rename one key at a time,
deletes it, the move to next one? I'm thinking of adding {{bucket.deleteKey}} around line
267-268, and remove {{delete(src, true);}} on line 358. Not sure if this is enough though.
2. {{OzoneListingIterator}} make it an inner class of OzoneFileSystem? Because it seems file
system calls delete, list status and rename are and will be the only use of this class.
3. in mkdir, seems when an inode in the path is a file, mkdir gets rollback (line 463). Should
we also roll back if createDir fails (line 473)
4. "Directory is represented using empty key with no value.” did you mean root directory?
5. OzoneListingIterator#iterate and processKey() both return a boolean but seems nowhere depends
on this return value. So this seems a bit unnecessary to me. Do we need to have processKey
and iterate to return anything at all? 


Just log a word "Success" does not seem to be very useful, can expand this message a little
bit? Similarly for {{KeyProcessTemplate}}

> Ozone: OzoneFileSystem: delete/list status/rename/mkdir APIs
> ------------------------------------------------------------
>                 Key: HDFS-12572
>                 URL: https://issues.apache.org/jira/browse/HDFS-12572
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Mukul Kumar Singh
>            Assignee: Mukul Kumar Singh
>              Labels: ozoneMerge
>             Fix For: HDFS-7240
>         Attachments: HDFS-12572-HDFS-7240.001.patch, HDFS-12572-HDFS-7240.002.patch,
HDFS-12572-HDFS-7240.003.patch, HDFS-12572-HDFS-7240.004.patch
> This jira will add the delete/list status/rename/mkdir APIs

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