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From David Wei <weiw...@kingsoft.com>
Subject Why did I only get 2 live datanodes?
Date Thu, 16 Oct 2008 03:05:23 GMT
We had installed hadoop on 4 machines, and one of them has been chosen 
to be master and also slaves. The rest of machines are configured as 
slaves. But it is strange that we can only see 2 live nodes on web 
UI:http://192.168.52.129:50070/dfshealth.jsp(master machine). When we 
try to refresh the page, we found that only 2 nodes are listed and one 
of them are continuing replaced by others.

After using command:bin/hadoop dfsadmin -report, we got only 2 data 
nodes listed.

Another thing is we found this in the log 
file(hadoop-root-namenode-datacenter5.log
---datacenter5 is the name of master):
2008-10-16 02:45:12,384 INFO org.apache.hadoop.dfs.StateChange: BLOCK* 
NameSystem.registerDatanode: node 192.168.49.148:50010 is replaced by 
192.168.52.129:50010 with the same storageID 
DS-2140035130-127.0.0.1-50010-1223898963914
.......
2008-10-16 02:45:12,432 INFO org.apache.hadoop.dfs.StateChange: BLOCK* 
NameSystem.registerDatanode: node 192.168.52.129:50010 is replaced by 
192.168.55.104:50010 with the same storageID 
DS-2140035130-127.0.0.1-50010-1223898963914
........
2008-10-16 02:45:13,380 INFO org.apache.hadoop.dfs.StateChange: BLOCK* 
NameSystem.registerDatanode: node 192.168.55.104:50010 is replaced by 
192.168.49.148:50010 with the same storageID 
DS-2140035130-127.0.0.1-50010-1223898963914

Is there any problem with our configuration or maybe we just missed some 
options?

BTW, my machines are total different in hardware, such as memory, disk 
and cpu.

Thx!

David





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