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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-347) Implement HDFS content browsing interface
Date Thu, 13 Jul 2006 15:48:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-347?page=comments#action_12420885 ] 

Yoram Arnon commented on HADOOP-347:
------------------------------------

a typical scenario is for a user to click on a generic link from some front page to browse
the dfs, without specifying a file. The namenode will redirect to a datanode, the user browses
the directory hierarchy, then views files.
it's thus impossible to direct the client to the datanode that contains the first block of
"the file" - it's not known when the client first connects.

one way to go about this, is to have the datanode do redirection too when actual contents
are requested. In that case we don't need to stop with the first block. Since GET requests
are stateless, the client can be redirected every time he needs a new dfs block.
I suggest pushing this all out for a later version for simplicity. Have the client connect
to a random node and keep him there, just load balancing clients.

> Implement HDFS content browsing interface
> -----------------------------------------
>
>          Key: HADOOP-347
>          URL: http://issues.apache.org/jira/browse/HADOOP-347
>      Project: Hadoop
>         Type: New Feature

>   Components: dfs
>     Versions: 0.1.0, 0.2.0, 0.1.1, 0.3.0, 0.4.0, 0.2.1, 0.3.1, 0.3.2
>     Reporter: Devaraj Das
>     Assignee: Devaraj Das
>      Fix For: 0.5.0

>
> Implement HDFS content browsing interface over HTTP. Clients would connect to the NameNode
and this would send a redirect to a random DataNode. The DataNode, via dfs client, would proxy
to namenode for metadata browsing and to other datanodes for content. One can also view the
local blocks on any DataNode. Head, Tail will be provided as shorthands for viewing the first
block and the last block of a file. 
> For full file viewing, the data displayed per HTTP request will be a block with a PREV/NEXT
link. The block size for viewing can be a configurable parameter (the user sets it via the
web browser) to the HTTP server (e.g., 256 KB can be the default block size for viewing files).

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