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From Eli Collins <...@cloudera.com>
Subject Re: Adding hard-disks to an existing HDFS cluster
Date Mon, 01 Mar 2010 19:02:55 GMT
On Mon, Mar 1, 2010 at 8:21 AM, Marc Farnum Rendino <mvgfr1@gmail.com> wrote:
> On Mon, Mar 1, 2010 at 5:48 AM, Steve Loughran <stevel@apache.org> wrote:
>> Best of all: a secondary namenode to get the streamed event log, as that
>> will mean your cluster restarts faster. You do not want to lose your NN
>> data.
> If the NN data is lost, all the HDFS data is functionally lost, right?

Yes, it is important that the NN metadata (the fsimage and edits log)
are stored reliably.  There's a great chapter on HDFS administration
in the book Hadoop: The Definitive Guide.


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