Hi Naidu, (a) As Steve already mentioned, please do not ask user questions on any of the *-dev lists as the list is only for project development and contributors, not general Q/A. (b) I've moved your question to user@hadoop.apache.org which is a proper list for general Q/A. (c) It is not a good thing to hijack another ongoing thread with your question. Please always send a new email with an appropriate subject for every new question. You can read more about etiquettes at http://www.catb.org/esr/faqs/smart-questions.html
Onto your answers: (1) This is a possibly known jps bug. It shouldn't be of any concern though, as its also related to what you're doing on your environment. Read http://bugs.sun.com/view_bug.do?bug_id=6637230 and http://bugs.sun.com/view_bug.do?bug_id=6602355. (2) The 1.x versions were case-sensitive on asking Y or N. It will not accept y the same as Y. This has been resolved in 2.x. On Wed, May 1, 2013 at 12:22 PM, Naidu MS <sanyasinaidu.malla...@gmail.com> 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 <c...@apache.org> 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* >> -- Harsh J