Let's add mapred.disk.healthChecker.interval to mapred-default.xml.
(Optional nit: Move the property into the comment section below it? Seems more appropriate if its next to the regular script interval opt.)
Nit-corrected patch. Committing.
Committing to 0.20.206. Thanks Eli!
Thanks Harsh! I left this option out of the node health script variables section because it's unrelated to the health script. ammended your commit on branch-20-security.
Closed upon release of Hadoop-1.1.0.