If you are talking about the "Incompatible namespace ID" issues, then look at https://issues.apache.org/jira/browse/HDFS-107 for a discussion on the topic.
It is a common issue with newcomers as they end up "formatting" at the first sight of trouble, or skip reading most of the tutorial that otherwise helps get configurations right. On Sat, Apr 7, 2012 at 12:31 AM, JAX <jayunit...@gmail.com> wrote: > Hi guys : I'm noticing that namespace conflicts or differences are a common > theme in hadoop both in my experience and now on this list Serv. > > Does anyone have any thoughts on why this is such a common issue and how it > will be dealt with in new releases? > > Jay Vyas > MMSB > UCHC -- Harsh J