This is a Cloudera release level.

Specifically, it's CDH3, update 5. It means we've taken hadoop-0.20.2,
added 923 additional patches during beta for CDH3, 421 patches applied
after the stable version of CDH.
https://ccp.cloudera.com/display/DOC/CDH+Version+and+Packaging+Information

A dot (.) patch level such as 923.21 indicates that a total of 944 patches
have been applied to the pristine source. In the case of CDH3
(hadoop-0.20.2+923.21), 923 patches were applied during the beta phase
before the Stable CDH3u0 release, and 21 more patches were applied after
Cloudera created a new branch for the CDH3u0 release. Once CDH3u0 was
released, further patches at CDH3u1, u2 and so on increment the dot patch
level.

Jeff
On Wed, Jan 16, 2013 at 9:04 AM, Seastrom, Jessica K <[EMAIL PROTECTED]>wrote:

>  +923 would be the patch number. I'm assuming, and will get
> clarification, but the .421 will make it even more specific. Will let you
> know what I find out about that, unless someone answers first.
>
>
>   From: Charles Ai <[EMAIL PROTECTED]>
> Reply-To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Date: Wednesday, January 16, 2013 9:11 AM
> To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
> Subject: A simple question - how to understand version number in
> "Hadoop-0.20.2+923.421" ?
>
>   Hi guys,
>
>  Specifically, what does "+923.421" mean ?
>
>
>  Regards
> Ch
>
>  --
> in a hadoop learning cycle
>