This has been my experience as well. This should be mentioned in the Getting Started pages until resolved.
-colin On Thu, Apr 10, 2008 at 10:54 AM, Michaela Buergle < [EMAIL PROTECTED]> wrote: > Hi all, > on http://wiki.apache.org/hadoop/GettingStartedWithHadoop - it says: > "Do not format a running Hadoop filesystem, this will cause all your > data to be erased." > > It seems to me however that currently you better not format a Hadoop > filesystem at all (after the first time, that is), running or not because: > > "Now if the cluster starts with the reformatted name-node, and not > reformatted data-nodes the data-nodes will fail with > java.io.IOException: Incompatible namespaceIDs ..." > (http://issues.apache.org/jira/browse/HADOOP-1212 + personal experience) > > If I haven't missed an obvious solution to this problem, I suggest > mentioning that issue in the Wiki. > > micha >
