The current stable version is the 1.0.x releases. This is well suited for production environments.
0.23.x/2.x.x releases is of alpha quality and hence not that recommended on production.
Sent from handheld, please excuse typos.
From: nisha <email@example.com>
Date: Tue, 9 Oct 2012 17:09:52 +0530
Subject: stable release of hadoop
17 September, 2012: Release 0.23.3 is this release a stable one
and can it be used in production...