Matt, Thanks a lot for your reply! I did formatted the namenode. But I got the same error again. And actually I successfully run the example jar file once, but after that one time, I couldn't get it run again. I clean the /tmp dir every time before I format namenode again(I am just testing it, so I don't worry about losing data:). Still, I got the same error when I execute the bin/start-dfs.sh . I checked my conf, and I can't figure out why. Here is my conf file:
I really appreciate if you could take a look at it. Thanks a lot. <configuration> <property> <name>fs.default.name</name> <value>hdfs://hostname1:9000</value> </property> <property> <name>mapred.job.tracker</name> <value>hostname2:9001</value> </property> <property> <name>dfs.data.dir</name> <value>/data/zhang/hadoop/dfs/data</value> <description>Determines where on the local filesystem an DFS data node should store its blocks. If this is a comma-delimited list of directories, then data will be stored in all named directories, typically on different devices. Directories that do not exist are ignored. </description> </property> <property> <name>mapred.local.dir</name> <value>/data/zhang/hadoop/mapred/local</value> <description>The local directory where MapReduce stores intermediate data files. May be a comma-separated list of directories on different devices in order to spread disk i/o. Directories that do not exist are ignored. </description> </property> </configuration> -----Original Message----- From: Matt Massie [mailto:m...@cloudera.com] Sent: Friday, June 26, 2009 4:31 PM To: core-user@hadoop.apache.org Subject: Re: Error in Cluster Startup: NameNode is not formatted Boyu- You didn't do anything stupid. I've forgotten to format a NameNode too myself. If you check the QuickStart guide at http://hadoop.apache.org/core/docs/current/quickstart.html you'll see that formatting the NameNode is the first of the Execution section (near the bottom of the page). The command to format the NameNode is: hadoop namenode -format A warning though, you should only format your NameNode once. Just like formatting any filesystem, you can loss data if you (re)format. Good luck. -Matt On Jun 26, 2009, at 1:25 PM, Boyu Zhang wrote: > Hi all, > > I am a student and I am trying to install the Hadoop on a cluster, I > have > one machine running namenode, one running jobtracker, two slaves. > > When I run the /bin/start-dfs.sh , there is something wrong with my > namenode, it won't start. Here is the error message in the log file: > > ERROR org.apache.hadoop.fs.FSNamesystem: FSNamesystem initialization > failed. > java.io.IOException: NameNode is not formatted. > at > org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:243) > at > org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:80) > at > org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:294) > at > org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:273) > at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:148) > at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:193) > at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:179) > at > org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:830) > at org.apache.hadoop.dfs.NameNode.main(NameNode.java:839) > > > I think it is something stupid i did, could somebody help me out? > Thanks a > lot! > > > Sincerely, > > Boyu Zhang
