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From Steve Loughran <ste...@apache.org>
Subject Re: bin/hadoop namenode -format IOException: Invalid argument
Date Wed, 24 Mar 2010 10:17:14 GMT
Gary Yang wrote:
> No. The namenode is not running. "bin/hadoop namenode -format" was the very first command.
I have not got chance to start the namenode yet. Any idea?

>>
>> 10/03/23 11:54:56 ERROR namenode.NameNode:
>> java.io.IOException: Invalid argument
>>         at
>> sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:900)
>>         at
>> java.nio.channels.FileChannel.tryLock(FileChannel.java:974)
>>         at
>> org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.tryLock(Storage.java:527)
>>         at
>> org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.lock(Storage.java:505)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1087)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1110)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:856)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:948)
>>         at
>> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)


That could be the filesystem being unhappy about some directory

Check all your namenode dir settings, make sure they are valid paths, 
try to create them as the hadoop user

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