FAQ
Reformatting should never be necessary if you are using released version
of hadoop. Hadoop-2783 refers to a bug that got introduced into trunk
(not in any released versions).

Thanks,
Dhruba


-----Original Message-----
From: Steve Sapovits
Sent: Friday, February 22, 2008 1:43 PM
To: core-user@hadoop.apache.org
Subject: Re: Namenode fails to re-start after cluster shutdown


What are the situations that make reformatting necessary? Testing, we
seem
to hit a lot of cases where we have to reformat. We're wondering how
much of
a real production issue this is.

--
Steve Sapovits
Invite Media - http://www.invitemedia.com
ssapovits@invitemedia.com

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