"hadoop namenode -format" returns a java.net.UnknownHostException
Solution 1
UnknownHostException is thrown when hadoop tries to resolve the DNS name (srv-clc-04.univ-nantes.prive3) to an ip address. This fails.
Look for the domain name in the configuration files and replace it by "localhost". (Or update the DNS up resolve the name to an ip address)
Solution 2
First get the host name of your computer. It can be obtained by running $hostname
command.
Then add 127.0.0.1 localhost hostname
into the /etc/hosts
file. That should solve the problem.
LabRat01010
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Updated on March 02, 2020Comments
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LabRat01010 about 4 years
I'm currently learning hadoop and I'm trying to setup a single node test as defined in http://hadoop.apache.org/common/docs/current/single_node_setup.html
I've configured ssh (I can log without a password).
My server is on our intranet, behind a proxy.
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 = 0.20.203.0 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
./bin/start-all.sh
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 fix this problem please ?
Thanks
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LabRat01010 almost 13 yearsThanks, I added an alias in /etc/hosts
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Rak over 8 yearsThanks, I too had the same issu updating /etc/hosts file helped