S. Venkatesh wrote:
HDFS Proxy in contrib provides HTTP interface over HDFS. Its not very RESTful but we are working on a new version which will have a REST API.AFAIK, Oozie will provide REST API for launching MR jobs.
I've done a webapp to do this (and some trickier things like creating the cluster when needed), some slides on it
http://www.slideshare.net/steve_l/long-haul-hadoopthere are links on there to the various JIRA issues which have discussed the topic