Hi Jeyendran, Were there any errors reported in the datanode logs? There could be a problem with datanodes contacting the namenode, caused by firewall configuration problems (EC2 security groups).
Cheers, Tom On Fri, Sep 4, 2009 at 12:17 AM, Jeyendran Balakrishnan<jbalakrish...@docomolabs-usa.com> wrote: > I downloaded Hadoop 0.20.0 and used the src/contrib/ec2/bin scripts to > launch a Hadoop cluster on Amazon EC2, after building a new Hadoop > 0.20.0 AMI. > > I launched an instance with my new Hadoop 0.20.0 AMI, then logged in and > ran the following to launch a new cluster: > root(/vol/hadoop-0.20.0)> bin/launch-hadoop-cluster hadoop-test 2 > > After the usual EC2 wait, one master and two slave instances were > launched on EC2, as expected. When I ssh'ed into the instances, here is > what I found: > > Slaves: DataNode and NameNode are running > Master: Only NameNode is running > > I could use HDFS commands (using $HADOOP_HOME/bin/hadoop scripts) > without any problems, from both master and slaves. However, since > JobTracker is not running, I cannot run map-reduce jobs. > > I checked the logs from /vol/hadoop-0.20.0/logs for the JobTracker, > reproduced below: > ------------------------------------------------------------------------ > ---- > 2009-09-03 18:55:38,486 WARN org.apache.hadoop.conf.Configuration: > DEPRECATED: hadoop-site.xml found in the classpath. Usage of > hadoop-site.xml is deprecated. Instead use core-site.xml, > mapred-site.xml and h > dfs-site.xml to override properties of core-default.xml, > mapred-default.xml and hdfs-default.xml respectively > 2009-09-03 18:55:38,520 INFO org.apache.hadoop.mapred.JobTracker: > STARTUP_MSG: > /************************************************************ > STARTUP_MSG: Starting JobTracker > STARTUP_MSG: host = > domU-12-31-39-06-44-E3.compute-1.internal/10.208.75.17 > STARTUP_MSG: args = [] > STARTUP_MSG: version = 0.20.0 > STARTUP_MSG: build = > https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.20 -r > 763504; compiled by 'ndaley' on Thu Apr 9 05:18:40 UTC 2009 > ************************************************************/ > 2009-09-03 18:55:38,652 INFO org.apache.hadoop.ipc.metrics.RpcMetrics: > Initializing RPC Metrics with hostName=JobTracker, port=50002 > 2009-09-03 18:55:38,703 INFO org.mortbay.log: Logging to > org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via > org.mortbay.log.Slf4jLog > 2009-09-03 18:55:38,827 INFO org.apache.hadoop.http.HttpServer: Jetty > bound to port 50030 > 2009-09-03 18:55:38,827 INFO org.mortbay.log: jetty-6.1.14 > 2009-09-03 18:55:48,425 INFO org.mortbay.log: Started > selectchannelconnec...@0.0.0.0:50030 > 2009-09-03 18:55:48,427 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: > Initializing JVM Metrics with processName=JobTracker, sessionId= > 2009-09-03 18:55:48,432 INFO org.apache.hadoop.mapred.JobTracker: > JobTracker up at: 50002 > 2009-09-03 18:55:48,432 INFO org.apache.hadoop.mapred.JobTracker: > JobTracker webserver: 50030 > 2009-09-03 18:55:48,541 INFO org.apache.hadoop.mapred.JobTracker: > Cleaning up the system directory > 2009-09-03 18:55:48,628 INFO org.apache.hadoop.hdfs.DFSClient: > org.apache.hadoop.ipc.RemoteException: java.io.IOException: File > /mnt/hadoop/mapred/system/jobtracker.info could only be replicated to 0 > nodes, > instead of 1 > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(F > SNamesystem.java:1256) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:4 > 22) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav > a:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor > Impl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953) > > at org.apache.hadoop.ipc.Client.call(Client.java:739) > at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220) > at $Proxy4.addBlock(Unknown Source) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav > a:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor > Impl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvo > cationHandler.java:82) > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocation > Handler.java:59) > at $Proxy4.addBlock(Unknown Source) > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DF > SClient.java:2873) > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(D > FSClient.java:2755) > > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.j > ava:2046) > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSCli > ent.java:2232) > > 2009-09-03 18:55:48,628 WARN org.apache.hadoop.hdfs.DFSClient: > NotReplicatedYetException sleeping > /mnt/hadoop/mapred/system/jobtracker.info retries left 4 > 2009-09-03 18:55:49,030 INFO org.apache.hadoop.hdfs.DFSClient: > org.apache.hadoop.ipc.RemoteException: java.io.IOException: File > /mnt/hadoop/mapred/system/jobtracker.info could only be replicated to 0 > nodes, > instead of 1 > ... > ------------------------------------------------------------------------ > ---- > The JobTracker ports are all free [not used by any other process]. > > Any suggestions would be appreciated. > > Thanks a lot, > Jeyendran > >
