[YARN-2828] Enable auto refresh of web pages (using http parameter)

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Labels: oct16-easy

Release Note

The patch implements an optional "refresh" parameter for resource manager pages. It contains the following:
- Modified RmView.java to check if there is an HTTP "refresh" parameter, and if so sanitize it (to protect against XSS attacks) and generate a meta http autorefresh tag on the page with the requested refresh interval.
- Test case that verifies the presence of the meta http refresh tag in the rendered HTML.
- Added Jsoup (http://jsoup.org/) to the pom.xml file, since we need that for URL sanitization.

• Assignee: Vijay Bhat
• Reporter: Tim Robertson
• Created: 07/Nov/14 13:28
• Updated: 28/Oct/16 00:20

Description

The MR1 Job Tracker had a useful HTTP parameter of e.g. "&refresh=3" that could be appended to URLs which enabled a page reload. This was very useful when developing mapreduce jobs, especially to watch counters changing. This is lost in the the Yarn interface.

Could be implemented as a page element (e.g. drop down or so), but I'd recommend that the page not be more cluttered, and simply bring back the optional "refresh" HTTP param. It worked really nicely.