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Hadoop >> mail # user >> Re: what will happen when HDFS restarts but with some dead nodes


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Re: what will happen when HDFS restarts but with some dead nodes
So, we can assume that all blocks are fully replicated at the start point of HDFS?

Best,

--
Nan Zhu
School of Computer Science,
McGill University

On Tuesday, 29 January, 2013 at 10:50 PM, Chen He wrote:

> Hi Nan
>
> Namenode will stay in safemode before all blocks are replicated. During this time, the jobtracker can not see any tasktrackers. (MRv1).
>
> Chen
>
> On Tue, Jan 29, 2013 at 9:04 PM, Nan Zhu <[EMAIL PROTECTED] (mailto:[EMAIL PROTECTED])> wrote:
> > Hi, all
> >
> > I'm wondering if HDFS is stopped, and some of the machines of the cluster are moved,  some of the block replication are definitely lost for moving machines
> >
> > when I restart the system, will the namenode recalculate the data distribution?
> >
> > Best,
> >
> > --
> > Nan Zhu
> > School of Computer Science,
> > McGill University
> >
> >
>