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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1568) NameNode Schema for HttpFileSystem
Date Mon, 09 Jul 2007 21:54:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511268
] 

Owen O'Malley commented on HADOOP-1568:
---------------------------------------

The problem is that under our proposal the planner does 1 http get. Under your proposal, the
planner does 10 million (or 40 million without caching) serial http head operations. That
will take a long time. The actual gets will take a long time, but they are running in parallel
and will be answered by the datanodes.

> NameNode Schema for HttpFileSystem
> ----------------------------------
>
>                 Key: HADOOP-1568
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1568
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Chris Douglas
>            Assignee: Chris Douglas
>
> This issue will track the design and implementation of (the first pass of) a servlet
on the namenode for querying its filesystem via HTTP. The proposed syntax for queries and
responses is as follows.
> *Query*
> {noformat}GET http://<nn>:<port>/ls.jsp[<?option>[&option]*] HTTP/1.1{noformat}
> Where _option_ may be any of the following query parameters:
> _path_ : String (default: '/')
> _recursive_ : boolean (default: false)
> _filter_ : String (default: none)
> *Response*
> The response will be returned as an XML document in the following format:
> {noformat}
> <listing path="..." recursive="(yes|no)" filter="..."
>          time="yyyy-MM-dd hh:mm:ss UTC" version="...">
>   <directory path="..."/>
>   <file path="..." modified="yyyy-MM-dd hh:mm:ss" blocksize="..."
>         replication="..." size="..."
>         dnurl="http://dn:port/streamFile?..."/>
> </listing>
> {noformat}

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