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From Nan Zhu <zhunans...@gmail.com>
Subject Re: what will happen when HDFS restarts but with some dead nodes
Date Wed, 30 Jan 2013 03:53:38 GMT
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 <zhunansjtu@gmail.com (mailto:zhunansjtu@gmail.com)>
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
> > 
> > 
> 


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