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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4502) WebHdfsFileSystem handling of ifile field breaks compatibility and breaks HttpFS
Date Wed, 20 Feb 2013 01:26:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13581843#comment-13581843
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4502:
----------------------------------------------

> ... I'm just trying to understand what is the use case for having the fileId avail in
the FileStatus returned by the WebHDFS REST API.

First of all, I like to emphasize fileId is not in WebHDFS REST API.  It is just that the
Namenode implementation of WebHDFS REST API returns fileId as an additional property.

I think your question is: why returning fileId as an additional property in Namenode?  The
reason is that HdfsFileStatus requires fileId.  If WebHdfsFileSystem does not set it, then
some internal use of HdfsFileStatus may not work.
                
> WebHdfsFileSystem handling of ifile field breaks compatibility and breaks HttpFS
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-4502
>                 URL: https://issues.apache.org/jira/browse/HDFS-4502
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: webhdfs
>    Affects Versions: 3.0.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Brandon Li
>            Priority: Blocker
>         Attachments: HDFS-4502.patch
>
>
> HDFS-4340 introduced a new field {{fileId}} in WebHDFS FileStatus JSON representation.
> There are a two issues with this:
> * This is changing the WebHDFS REST API, this has not been documented
> * WebHdfsFileSystem should not fail when that field is not present (This is the case
when using HttpFS against a FS implementation -other than HDFS- which does not handle fileId)

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