I ran into this trouble again. This time, formatting the namenode didnt help. So, I changed the directories where the metadata and the data was being stored. That made it work.
You might want to check this up at your end too. Amandeep PS: I dont have an explanation for how and why this made it work. Amandeep Khurana Computer Science Graduate Student University of California, Santa Cruz On Sat, Feb 7, 2009 at 9:06 AM, jason hadoop <jason.had...@gmail.com> wrote: > On your master machine, use the netstat command to determine what ports and > addresses the namenode process is listening on. > > On the datanode machines, examine the log files,, to verify that the > datanode has attempted to connect to the namenode ip address on one of > those > ports, and was successfull. > > The common ports used for datanode -> namenode rondevu are 50010, 54320 and > 8020, depending on your hadoop version > > If the datanodes have been started, and the connection to the namenode > failed, there will be a log message with a socket error, indicating what > host and port the datanode used to attempt to communicate with the > namenode. > Verify that that ip address is correct for your namenode, and reachable > from > the datanode host (for multi homed machines this can be an issue), and that > the port listed is one of the tcp ports that the namenode process is > listing > on. > > For linux, you can use command > *netstat -a -t -n -p | grep java | grep LISTEN* > to determine the ip addresses and ports and pids of the java processes that > are listening for tcp socket connections > > and the jps command from the bin directory of your java installation to > determine the pid of the namenode. > > On Sat, Feb 7, 2009 at 6:27 AM, shefali pawar <shefal...@rediffmail.com > >wrote: > > > Hi, > > > > No, not yet. We are still struggling! If you find the solution please let > > me know. > > > > Shefali > > > > On Sat, 07 Feb 2009 02:56:15 +0530 wrote > > >I had to change the master on my running cluster and ended up with the > > same > > >problem. Were you able to fix it at your end? > > > > > >Amandeep > > > > > > > > >Amandeep Khurana > > >Computer Science Graduate Student > > >University of California, Santa Cruz > > > > > > > > >On Thu, Feb 5, 2009 at 8:46 AM, shefali pawar wrote: > > > > > >> Hi, > > >> > > >> I do not think that the firewall is blocking the port because it has > > been > > >> turned off on both the computers! And also since it is a random port > > number > > >> I do not think it should create a problem. > > >> > > >> I do not understand what is going wrong! > > >> > > >> Shefali > > >> > > >> On Wed, 04 Feb 2009 23:23:04 +0530 wrote > > >> >I'm not certain that the firewall is your problem but if that port is > > >> >blocked on your master you should open it to let communication > through. > > >> Here > > >> >is one website that might be relevant: > > >> > > > >> > > > >> > > > http://stackoverflow.com/questions/255077/open-ports-under-fedora-core-8-for-vmware-server > > >> > > > >> >but again, this may not be your problem. > > >> > > > >> >John > > >> > > > >> >On Wed, Feb 4, 2009 at 12:46 PM, shefali pawar wrote: > > >> > > > >> >> Hi, > > >> >> > > >> >> I will have to check. I can do that tomorrow in college. But if > that > > is > > >> the > > >> >> case what should i do? > > >> >> > > >> >> Should i change the port number and try again? > > >> >> > > >> >> Shefali > > >> >> > > >> >> On Wed, 04 Feb 2009 S D wrote : > > >> >> > > >> >> >Shefali, > > >> >> > > > >> >> >Is your firewall blocking port 54310 on the master? > > >> >> > > > >> >> >John > > >> >> > > > >> >> >On Wed, Feb 4, 2009 at 12:34 PM, shefali pawar > >wrote: > > >> >> > > > >> >> > > Hi, > > >> >> > > > > >> >> > > I am trying to set-up a two node cluster using Hadoop0.19.0, > with > > 1 > > >> >> > > master(which should also work as a slave) and 1 slave node. > > >> >> > > > > >> >> > > But while running bin/start-dfs.sh the datanode is not starting > > on > > >> the > > >> >> > > slave. I had read the previous mails on the list, but nothing > > seems > > >> to > > >> >> be > > >> >> > > working in this case. I am getting the following error in the > > >> >> > > hadoop-root-datanode-slave log file while running the command > > >> >> > > bin/start-dfs.sh => > > >> >> > > > > >> >> > > 2009-02-03 13:00:27,516 INFO > > >> >> > > org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: > > >> >> > > /************************************************************ > > >> >> > > STARTUP_MSG: Starting DataNode > > >> >> > > STARTUP_MSG: host = slave/172.16.0.32 > > >> >> > > STARTUP_MSG: args = [] > > >> >> > > STARTUP_MSG: version = 0.19.0 > > >> >> > > STARTUP_MSG: build = > > >> >> > > > > https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.19-r > > >> >> > > 713890; compiled by 'ndaley' on Fri Nov 14 03:12:29 UTC 2008 > > >> >> > > ************************************************************/ > > >> >> > > 2009-02-03 13:00:28,725 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 0 time(s). > > >> >> > > 2009-02-03 13:00:29,726 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 1 time(s). > > >> >> > > 2009-02-03 13:00:30,727 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 2 time(s). > > >> >> > > 2009-02-03 13:00:31,728 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 3 time(s). > > >> >> > > 2009-02-03 13:00:32,729 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 4 time(s). > > >> >> > > 2009-02-03 13:00:33,730 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 5 time(s). > > >> >> > > 2009-02-03 13:00:34,731 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 6 time(s). > > >> >> > > 2009-02-03 13:00:35,732 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 7 time(s). > > >> >> > > 2009-02-03 13:00:36,733 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 8 time(s). > > >> >> > > 2009-02-03 13:00:37,734 INFO org.apache.hadoop.ipc.Client: > > Retrying > > >> >> connect > > >> >> > > to server: master/172.16.0.46:54310. Already tried 9 time(s). > > >> >> > > 2009-02-03 13:00:37,738 ERROR > > >> >> > > org.apache.hadoop.hdfs.server.datanode.DataNode: > > >> java.io.IOException: > > >> >> Call > > >> >> > > to master/172.16.0.46:54310 failed on local exception: No > route > > to > > >> >> host > > >> >> > > at org.apache.hadoop.ipc.Client.call(Client.java:699) > > >> >> > > at > org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216) > > >> >> > > at $Proxy4.getProtocolVersion(Unknown Source) > > >> >> > > at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:319) > > >> >> > > at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:306) > > >> >> > > at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:343) > > >> >> > > at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:288) > > >> >> > > at > > >> >> > > > > >> >> > > >> > > > org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:258) > > >> >> > > at > > >> >> > > > > >> >> org.apache.hadoop.hdfs.server.datanode.DataNode.(DataNode.java:205) > > >> >> > > at > > >> >> > > > > >> >> > > >> > > > org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1199) > > >> >> > > at > > >> >> > > > > >> >> > > >> > > > org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1154) > > >> >> > > at > > >> >> > > > > >> >> > > >> > > > org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1162) > > >> >> > > at > > >> >> > > > > >> >> > > org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1284) > > >> >> > > Caused by: java.net.NoRouteToHostException: No route to host > > >> >> > > at sun.nio.ch.SocketChannelImpl.checkConnect(Native > > Method) > > >> >> > > at > > >> >> > > > > >> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574) > > >> >> > > at > > sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:100) > > >> >> > > at > > >> >> > > > > >> > org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:299) > > >> >> > > at > > >> >> > > > > org.apache.hadoop.ipc.Client$Connection.access$1700(Client.java:176) > > >> >> > > at > > >> org.apache.hadoop.ipc.Client.getConnection(Client.java:772) > > >> >> > > at org.apache.hadoop.ipc.Client.call(Client.java:685) > > >> >> > > ... 12 more > > >> >> > > > > >> >> > > 2009-02-03 13:00:37,739 INFO > > >> >> > > org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: > > >> >> > > /************************************************************ > > >> >> > > SHUTDOWN_MSG: Shutting down DataNode at slave/172.16.0.32 > > >> >> > > ************************************************************/ > > >> >> > > > > >> >> > > > > >> >> > > Also, the Pseudo distributed operation is working on both the > > >> machines. > > >> >> And > > >> >> > > i am able to ssh from 'master to master' and 'master to slave' > > via a > > >> >> > > password-less ssh login. I do not think there is any problem > with > > >> the > > >> >> > > network because cross pinging is working fine. > > >> >> > > > > >> >> > > I am working on Linux (Fedora 8) > > >> >> > > > > >> >> > > The following is the configuration which i am using > > >> >> > > > > >> >> > > On master and slave, /conf/masters looks like this: > > >> >> > > > > >> >> > > master > > >> >> > > > > >> >> > > On master and slave, /conf/slaves looks like this: > > >> >> > > > > >> >> > > master > > >> >> > > slave > > >> >> > > > > >> >> > > On both the machines conf/hadoop-site.xml looks like this > > >> >> > > > > >> >> > > > > >> >> > > fs.default.name > > >> >> > > hdfs://master:54310 > > >> >> > > The name of the default file system. A URI whose > > >> >> > > scheme and authority determine the FileSystem implementation. > > The > > >> >> > > uri's scheme determines the config property (fs.SCHEME.impl) > > naming > > >> >> > > the FileSystem implementation class. The uri's authority is > > used > > >> to > > >> >> > > determine the host, port, etc. for a filesystem. > > >> >> > > > > >> >> > > > > >> >> > > mapred.job.tracker > > >> >> > > master:54311 > > >> >> > > The host and port that the MapReduce job tracker runs > > >> >> > > at. If "local", then jobs are run in-process as a single map > > >> >> > > and reduce task. > > >> >> > > > > >> >> > > > > >> >> > > > > >> >> > > dfs.replication > > >> >> > > 2 > > >> >> > > Default block replication. > > >> >> > > The actual number of replications can be specified when the > file > > is > > >> >> > > created. > > >> >> > > The default is used if replication is not specified in create > > time. > > >> >> > > > > >> >> > > > > >> >> > > > > >> >> > > namenode is formatted succesfully by running > > >> >> > > > > >> >> > > "bin/hadoop namenode -format" > > >> >> > > > > >> >> > > on the master node. > > >> >> > > > > >> >> > > I am new to Hadoop and I do not know what is going wrong. > > >> >> > > > > >> >> > > Any help will be appreciated. > > >> >> > > > > >> >> > > Thanking you in advance > > >> >> > > > > >> >> > > Shefali Pawar > > >> >> > > Pune, India > > >> >> > > > > >> >> > > >> >> > > >> >> > > >> > > > >> > > > > > >
