Hi, Naidu, Those are Hadoop question and you should send to u...@hadoop.apache.org. A quick answer to double "hadoop namenode -format" question is, once you do that, you lose the metadata, you would have trouble getting hdfs files back.
Thanks, Daniel On Wed, May 1, 2013 at 12:25 AM, 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? > > > On Wed, May 1, 2013 at 9:47 AM, Cheolsoo Park <piaozhe...@gmail.com> > wrote: > > > Please see the following wiki page: > > https://cwiki.apache.org/confluence/display/PIG/HowToContribute > > > > Thanks, > > Cheolsoo > > > > > > On Tue, Apr 30, 2013 at 9:10 PM, Naidu MS > > <sanyasinaidu.malla...@gmail.com>wrote: > > > > > Hi How to get the source of pig? > > > I am interested in going to source code so that i can learn how the > > > framework is written. > > > I can help in fixing some minor bugs/jira issues. > > > Can some one help me how to get the source code ? > > > > > > > > > > > > Regards, > > > Naidu > > > > > > > > > On Wed, May 1, 2013 at 9:30 AM, Cheolsoo Park <piaozhe...@gmail.com> > > > wrote: > > > > > > > Welcome to Pig. There are hundreds of open jiras: > > > > > > > > > > > > > > > > > > https://issues.apache.org/jira/issues/?jql=project%20%3D%20PIG%20AND%20status%20%3D%20Open%20ORDER%20BY%20created%20DESC%2C%20priority%20DESC > > > > > > > > Please feel free to submit patches. > > > > > > > > Thanks, > > > > Cheolsoo > > > > > > > > > > > > > > > > On Tue, Apr 30, 2013 at 4:16 PM, Vineet Nair <to.vrn...@gmail.com> > > > wrote: > > > > > > > > > Hello all , > > > > > > > > > > I was just going through the source code of Pig and I would very > much > > > > like > > > > > to contribute to it. > > > > > I was just wondering if there are any small Jira requests that i > can > > > > start > > > > > working on. > > > > > > > > > > Thanks and regards, > > > > > Vineet > > > > > > > > > > > > > > >
