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https://issues.apache.org/jira/browse/HADOOP-496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536733
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Michael Bieniosek commented on HADOOP-496:
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> You can use telnet to connect to the server and send handmade http requests.
I tried telnetting to the server and doing a GET /path/to/file.tgz. This gave
me a 200 with an empty body. If I try to GET a file that doesn't exist, I get
a 404 with an html error page.
> Expose HDFS as a WebDAV store
> -----------------------------
>
> Key: HADOOP-496
> URL: https://issues.apache.org/jira/browse/HADOOP-496
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs
> Reporter: Michel Tourn
> Assignee: Enis Soztutar
> Attachments: hadoop-webdav.zip, jetty-slide.xml, lib.webdav.tar.gz,
> slideusers.properties, webdav_wip1.patch, webdav_wip2.patch
>
>
> WebDAV stands for Distributed Authoring and Versioning. It is a set of
> extensions to the HTTP protocol that lets users collaboratively edit and
> manage files on a remote web server. It is often considered as a replacement
> for NFS or SAMBA
> HDFS (Hadoop Distributed File System) needs a friendly file system interface.
> DFSShell commands are unfamiliar. Instead it is more convenient for Hadoop
> users to use a mountable network drive. A friendly interface to HDFS will be
> used both for casual browsing of data and for bulk import/export.
> The FUSE provider for HDFS is already available (
> http://issues.apache.org/jira/browse/HADOOP-17 ) but it had scalability
> problems. WebDAV is a popular alternative.
> The typical licensing terms for WebDAV tools are also attractive:
> GPL for Linux client tools that Hadoop would not redistribute anyway.
> More importantly, Apache Project/Apache license for Java tools and for server
> components.
> This allows for a tighter integration with the HDFS code base.
> There are some interesting Apache projects that support WebDAV.
> But these are probably too heavyweight for the needs of Hadoop:
> Tomcat servlet:
> http://tomcat.apache.org/tomcat-4.1-doc/catalina/docs/api/org/apache/catalina/servlets/WebdavServlet.html
> Slide: http://jakarta.apache.org/slide/
> Being HTTP-based and "backwards-compatible" with Web Browser clients, the
> WebDAV server protocol could even be piggy-backed on the existing Web UI
> ports of the Hadoop name node / data nodes. WebDAV can be hosted as (Jetty)
> servlets. This minimizes server code bloat and this avoids additional network
> traffic between HDFS and the WebDAV server.
> General Clients (read-only):
> Any web browser
> Linux Clients:
> Mountable GPL davfs2 http://dav.sourceforge.net/
> FTP-like GPL Cadaver http://www.webdav.org/cadaver/
> Server Protocol compliance tests:
> http://www.webdav.org/neon/litmus/
> A goal is for Hadoop HDFS to pass this test (minus support for Properties)
> Pure Java clients:
> DAV Explorer Apache lic. http://www.ics.uci.edu/~webdav/
> WebDAV also makes it convenient to add advanced features in an incremental
> fashion:
> file locking, access control lists, hard links, symbolic links.
> New WebDAV standards get accepted and more or less featured WebDAV clients
> exist.
> core http://www.webdav.org/specs/rfc2518.html
> ACLs http://www.webdav.org/specs/rfc3744.html
> redirects "soft links" http://greenbytes.de/tech/webdav/rfc4437.html
> BIND "hard links" http://www.webdav.org/bind/
> quota http://tools.ietf.org/html/rfc4331
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