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https://issues.apache.org/jira/browse/HADOOP-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12524187
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Doug Cutting commented on HADOOP-1568:
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> 2. Is HftpFileSystem a typo?
No. It's not generic access to filesystems over HTTP (as I attempted in
HADOOP-1563) but rather access to the Hadoop FileSystem feature set over HTTP.
We couldn't specify 'http' as the URI's scheme, since the actual URL accessed
doesn't match this. The HftpFileSystem implementation translates the hftp:
URIs to HTTP URLs accessing two servlets, one for directory listings and
another for file content.
The purpose of all this is to provide a version-independent means to access
HDFS filesystems, for back-compatiblity. So, if you're running two clusters
and only upgrade one, but wish them to be able to access one another, this
should let you. This protocol is simple-enough that we don't expect it to
change incompatibly, unlike HDFS's internal protocols, which change regularly.
> 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
> Fix For: 0.14.0
>
> Attachments: 1568-6.patch, compat.patch, xmlenc-0.52.jar
>
>
> 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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