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* >
