linux - Hadoop 2.2 on Ubuntu 12.04. Namenode wont't start. Why? -


i'm following tutorial - http://www.ercoppa.org/linux-install-hadoop-220-on-ubuntu-linux-1304-single-node-cluster.htm

when start services. namenode doesn't start. following namenode log. tried searching error on google, couldn't find solution. tried deleting namenode in directory, deleting whole namenode-data-directory , formatting namenode. no luck. i'd appreciate help.

org.apache.hadoop.hdfs.server.common.storage: lock on /home/username/hadoop/data/namenode/in_use.lock acquired nodename 25382@username-hp-envy-15-notebook-pc   org.mortbay.log: stopped selectchannelconnector@0.0.0.0:50070   org.apache.hadoop.metrics2.impl.metricssystemimpl: stopping namenode metrics system...   org.apache.hadoop.metrics2.impl.metricssystemimpl: namenode metrics system stopped.   org.apache.hadoop.metrics2.impl.metricssystemimpl: namenode metrics system stopped.   org.apache.hadoop.metrics2.impl.metricssystemimpl: namenode metrics system stopped.   org.apache.hadoop.metrics2.impl.metricssystemimpl: namenode metrics system stopped.   java.io.ioexception: namenode not formatted.     @ org.apache.hadoop.hdfs.server.namenode.fsimage.recovertransitionread(fsimage.java:210)     @ org.apache.hadoop.hdfs.server.namenode.fsnamesystem.loadfsimage(fsnamesystem.java:787)     @ org.apache.hadoop.hdfs.server.namenode.fsnamesystem.loadfromdisk(fsnamesystem.java:568)     @ org.apache.hadoop.hdfs.server.namenode.namenode.loadnamesystem(namenode.java:443)     @ org.apache.hadoop.hdfs.server.namenode.namenode.initialize(namenode.java:491)     @ org.apache.hadoop.hdfs.server.namenode.namenode.<init>(namenode.java:684)     @ org.apache.hadoop.hdfs.server.namenode.namenode.<init>(namenode.java:669)     @ org.apache.hadoop.hdfs.server.namenode.namenode.createnamenode(namenode.java:1254)     @ org.apache.hadoop.hdfs.server.namenode.namenode.main(namenode.java:1320)   org.apache.hadoop.util.exitutil: exiting status 1   info org.apache.hadoop.hdfs.server.namenode.namenode: shutdown_msg:

what output in "format hdfs" step? exception message clear:

java.io.ioexception: namenode not formatted.


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