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From "Alejandro Abdelnur (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2316) webhdfs: a complete FileSystem implementation for accessing HDFS over HTTP
Date Fri, 21 Oct 2011 14:18:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132692#comment-13132692
] 

Alejandro Abdelnur commented on HDFS-2316:
------------------------------------------

---
@Nicholas,

Thanks for the API document. In general it looks OK. A few comments:

* GET GETHOMEDIRECTORY operation is missing.

* The GETFILEBLOCKLOCATIONS, GETDELEGATIONTOKEN, RENEWDELEGATIONTOKEN, CANCELDELEGATIONTOKEN
operations seem to be the ones that don't make sense (at the moment) in a proxy scenario.
We should make those operations as optional.

* The 'doas' query parameter is missing, this is required to enable proxyuser functionality.

* The 'user.name' query parameter is optional as this is used only in the case of pseudo authentication,
in the case of other authentication mechanism the username will be taken for the authentication
credentials.

* The document does not define any of the JSON responses nor error codes and JSON error messages.
I assume you are taking the JSON responses in the doc posted in HDFS-2178. Still this has
to be augmented for checksum and content-summary responses.

* IMO we need operations to get create and append handles, reason in my response to Sanjay
in HDFS-2178 (https://issues.apache.org/jira/browse/HDFS-2178?focusedCommentId=13132691&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13132691)

* The webhdfs prefix should be optional/configurable and it should be provided by server on
a 'filsystem.get' operation.


                
> webhdfs: a complete FileSystem implementation for accessing HDFS over HTTP
> --------------------------------------------------------------------------
>
>                 Key: HDFS-2316
>                 URL: https://issues.apache.org/jira/browse/HDFS-2316
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: WebHdfsAPI20111020.pdf
>
>
> We current have hftp for accessing HDFS over HTTP.  However, hftp is a read-only FileSystem
and does not provide "write" accesses.
> In HDFS-2284, we propose to have webhdfs for providing a complete FileSystem implementation
for accessing HDFS over HTTP.  The is the umbrella JIRA for the tasks.

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