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Posted to common-issues@hadoop.apache.org by "Siyao Meng (JIRA)" <ji...@apache.org> on 2019/08/10 11:33:00 UTC
[jira] [Commented] (HADOOP-16082) FsShell ls: Add option -i to
print inode id
[ https://issues.apache.org/jira/browse/HADOOP-16082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904403#comment-16904403 ]
Siyao Meng commented on HADOOP-16082:
-------------------------------------
[~stevel@apache.org] So I abandoned the change in FileStatus class and overrided *HdfsLocatedFileStatus#toString* to add the fileId field. Therefore, I am able to parse the String in Ls#processPath. PR here: https://github.com/apache/hadoop/pull/1271
> 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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