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From zhangyujian1984 <zhangyujian1...@gmail.com>
Subject Re: How will Hadoop handle it when a datanode server with total hardware failure?
Date Wed, 17 Dec 2014 07:21:11 GMT
i think hadoop treats a node as a  minimal unit, which means a internal failure will be regards
as a node failure.
datanode uses heartbeat to keep block alive, if any block failure was detected by namenode,
it will be recovered 
in another datanode.



Yujian Zhang
Southeast University, Nanjing, China
 
From: Arthur.hk.chan@gmail.com
Date: 2014-12-17 14:05
To: <user@hadoop.apache.org>
CC: Arthur.hk.chan@gmail.com
Subject: How will Hadoop handle it when a datanode server with total hardware failure?
Hi,
 
If each of  my datanode servers has 8 hard disks (a 10-node cluster) and I use the default
replication factor of 3, how will Hadoop handle it when a datanode with total hardware failure
suddenly?  
 
Regards
Arthur
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