this is the kind of question you should take up with the user@hadoopmailing list
On 30 April 2013 23:52, Naidu MS <[email protected]> wrote: > Hi i have two questions regarding hdfs and jps utility > > I am new to Hadoop and started leraning hadoop from the past week > > 1.when ever i start start-all.sh and jps in console it showing the > processes started > > *naidu@naidu:~/work/hadoop-1.0.4/bin$ jps* > *22283 NameNode* > *23516 TaskTracker* > *26711 Jps* > *22541 DataNode* > *23255 JobTracker* > *22813 SecondaryNameNode* > *Could not synchronize with target* > > But along with the list of process stared it always showing *" Could not > synchronize with target" *in the jps output. What is meant by "Could not > synchronize with target"? Can some one explain why this is happening? > > > 2.Is it possible to format namenode multiple times? When i enter the > namenode -format command, it not formatting the name node and showing the > following ouput. > > *naidu@naidu:~/work/hadoop-1.0.4/bin$ hadoop namenode -format* > *Warning: $HADOOP_HOME is deprecated.* > * > * > *13/05/01 12:08:04 INFO namenode.NameNode: STARTUP_MSG: * > */************************************************************* > *STARTUP_MSG: Starting NameNode* > *STARTUP_MSG: host = naidu/127.0.0.1* > *STARTUP_MSG: args = [-format]* > *STARTUP_MSG: version = 1.0.4* > *STARTUP_MSG: build = > https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r > 1393290; compiled by 'hortonfo' on Wed Oct 3 05:13:58 UTC 2012* > *************************************************************/* > *Re-format filesystem in /home/naidu/dfs/namenode ? (Y or N) y* > *Format aborted in /home/naidu/dfs/namenode* > *13/05/01 12:08:05 INFO namenode.NameNode: SHUTDOWN_MSG: * > */************************************************************* > *SHUTDOWN_MSG: Shutting down NameNode at naidu/127.0.0.1* > * > * > *************************************************************/* > > Can someone help me in understanding this? Why is it not possible to format > name node multiple times? > > > Regards, > Naidu > > > > > > > On Wed, May 1, 2013 at 11:15 AM, Konstantin Boudnik <[email protected]> > wrote: > > > I have put together this chart some time ago and am trying to keep it up > to > > date (more or less). The most latest update is available here: > > http://is.gd/axRlgJ > > > > Sometimes picture worth a lot... you know ;) > > Cos > > > > On Fri, Apr 26, 2013 at 11:09AM, Suresh S wrote: > > > Hello, > > > > > > I was confused with Hadoop versioning. > > > I found that, some people working on version starting with "0". > > > Some others, working on version starting with "2". > > > Also, i was confused with "branch". > > > > > > Which version is really current version. > > > *Regards* > > > *S.Suresh,* > > > *Research Scholar,* > > > *Department of Computer Applications,* > > > *National Institute of Technology,* > > > *Tiruchirappalli - 620015.* > > > *+91-9941506562* > > >
