[jira] [Work stopped] (HADOOP-16082) FsShell ls: Add option -i to print inode id

["Siyao Meng (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HADOOP-16082 stopped by Siyao Meng.
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> FsShell ls: Add option -i to print inode id
> -------------------------------------------
>
>                 Key: HADOOP-16082
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16082
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: common
>    Affects Versions: 3.2.0, 3.1.1
>            Reporter: Siyao Meng
>            Assignee: Siyao Meng
>            Priority: Major
>         Attachments: HADOOP-16082.001.patch
>
>
> When debugging the FSImage corruption issue, I often need to know a file's or directory's inode id. At this moment, the only way to do that is to use OIV tool to dump the FSImage and look up the filename, which is very inefficient.
> Here I propose adding option "-i" in FsShell that prints files' or directories' inode id.
> h2. Implementation
> h3. For hdfs:// (HDFS)
> fileId exists in HdfsLocatedFileStatus, which is already returned to hdfs-client. We just need to print it in Ls#processPath().
> h3. For file:// (Local FS)
> h4. Linux
> Use java.nio.
> h4. Windows
> Windows has the concept of "File ID" which is similar to inode id. It is unique in NTFS and ReFS.
> h3. For other FS
> The fileId entry will be "0" in FileStatus if it is not set. We could either ignore or throw an exception.



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