Check http://namenode_host:50070/dfshealth.jsp to see if your cluster is out of safemode or not and how many datanodes are up.
You could check .out/.log files under the log directory to see if there is any error starting datanodes/namenode. Hairong -----Original Message----- From: jerrro [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 05, 2007 9:29 AM To: hadoop-user@lucene.apache.org Subject: Re: "could only be replicated to 0 nodes, instead of 1" I did this several times, while tuning the configuration in all kinds of way... But still, nothing helped - Even when I stop everything, reformat and start it back again, I get this error whenever trying to use dfs -put. Jason Venner-2 wrote: > > This happens to me, when the dfs has gotten into an inconsistent state. > > NOTE: you will lose all of the contents of your HDS file system. > > What I hae to do, is stop dfs, remove the contents of the dfs > directories on all the machines, hadoop namenode -format on the > controller, then restart dfs. > That consistently fixes the problem for me. This may be serious > overkill but it works. > > NOTE: you will lose all of the contents of your HDS file system. > > jerrro wrote: >> I am trying to install/configure hadoop on a cluster with several >> computers. >> I followed exactly the instructions in the hadoop website for >> configuring multiple slaves, and when I run start-all.sh I get no >> errors - both datanode and tasktracker are reported to be running >> (doing ps awux | grep hadoop on the slave nodes returns two java >> processes). Also, the log files are empty - nothing is printed there. >> Still, when I try to use bin/hadoop dfs -put, I get the following >> error: >> >> # bin/hadoop dfs -put w.txt w.txt >> put: java.io.IOException: File /user/scohen/w4.txt could only be >> replicated to 0 nodes, instead of 1 >> >> and a file of size 0 is created on the DFS (bin/hadoop dfs -ls shows it). >> >> I couldn't find much information about this error, but I did manage >> to see somewhere it might mean that there are no datanodes running. >> But as I said, start-all does not give any errors. Any ideas what >> could be problem? >> >> Thanks. >> >> Jerr. >> > > -- View this message in context: http://www.nabble.com/%22could-only-be-replicated-to-0-nodes%2C-instead- of-1%22-tf4950939.html#a14176525 Sent from the Hadoop Users mailing list archive at Nabble.com.
