Hadoop: Format namenode gives error: Shutting down NameNode at java.net.UnknownHostException

0 votes

When I'm trying to run

bin/hadoop namenode -format

I get the following java.net.UnknownHostException exception:

$ bin/hadoop namenode -format
11/06/10 15:36:47 INFO namenode.NameNode: STARTUP_MSG: 
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = java.net.UnknownHostException: srv-clc-04.univ-nantes.prive3: srv-clc-04.univ-nantes.prive3
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version =
STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-203 -r 1099333; compiled by 'oom' on Wed May  4 07:57:50 PDT 2011
Re-format filesystem in /home/lindenb/tmp/HADOOP/dfs/name ? (Y or N) Y
11/06/10 15:36:50 INFO util.GSet: VM type       = 64-bit
11/06/10 15:36:50 INFO util.GSet: 2% max memory = 19.1675 MB
11/06/10 15:36:50 INFO util.GSet: capacity      = 2^21 = 2097152 entries
11/06/10 15:36:50 INFO util.GSet: recommended=2097152, actual=2097152
11/06/10 15:36:50 INFO namenode.FSNamesystem: fsOwner=lindenb
11/06/10 15:36:50 INFO namenode.FSNamesystem: supergroup=supergroup
11/06/10 15:36:50 INFO namenode.FSNamesystem: isPermissionEnabled=true
11/06/10 15:36:50 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100
11/06/10 15:36:50 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)
11/06/10 15:36:50 INFO namenode.NameNode: Caching file names occuring more than 10 times 
11/06/10 15:36:50 INFO common.Storage: Image file of size 113 saved in 0 seconds.
11/06/10 15:36:50 INFO common.Storage: Storage directory /home/lindenb/tmp/HADOOP/dfs/name has been successfully formatted.
11/06/10 15:36:50 INFO namenode.NameNode: SHUTDOWN_MSG: 
SHUTDOWN_MSG: Shutting down NameNode at java.net.UnknownHostException: srv-clc-04.univ-nantes.prive3: srv-clc-04.univ-nantes.prive3

After that, hadoop was started


but there was another new exception when I tried to copy a local file:

 bin/hadoop fs  -copyFromLocal ~/file.txt  file.txt

DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/lindenb/file.txt could only be replicated to 0 nodes, instead of 1
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1417)

how can I solve this?

Nov 12, 2018 in Big Data Hadoop by slayer
• 29,040 points

1 answer to this question.

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UnknownHostException is thrown when hadoop tries to resolve the DNS name to an ip address. add localhost hostname into the /etc/hosts file. This should solve the error

answered Nov 12, 2018 by Omkar
• 65,850 points

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