When I try to format the namenode or even start it I'm getting the below error. What should be done??
$ bin/hadoop namenode -format
Exception in thread "main" java.lang.NoClassDefFoundError:
Caused by: java.lang.ClassNotFoundException:
...
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I set up 3 identical linux (CentOS) servers on Vmware. Basically built one and made 2 fully clones.
I edit each servers hostnames : server1, server2,server3 and added them to each ... |
Hadoop-0.20.2 Single Node Setup FAIL!!!! The jobtracker and namenode do not start :(
Any suggestions would be welcome.
As far as i know, i have set core-site.xml, hdfs-site.xml and mapred-site.xml correctly
... |
The namenode in the hadoop architecture is a single point of failure. How do people who have large hadoop clusters cope with this problem. Is there an industry-accepted solution that has ... |
I'd like to know how to password protect the Hadoop Web UIs running on ports 50030, 50070, etc.
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I checkout the source code from
http://svn.apache.org/repos/asf/hadoop/common
http://svn.apache.org/repos/asf/hadoop/hdfs
http://svn.apache.org/repos/asf/hadoop/mapreduce
and get
hadoop-mapred-0.23.0-SNAPSHOT.jar
hadoop-hdfs -0.23.0-SNAPSHOT.jar
hadoop-common-0.23.0-SNAPSHOT.jar
but I failed to start-all.sh with these jars...
Jobtracker and tasktracker started for just 5 secs and automatically ... |
When configuring my hadoop namenode for the first time, I know I need to run
bin/hadoop namenode -format
but running this a second time, after loading data into HDFS, will wipe out everything ... |
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The mapred task is a very simple 'wordcount' implemented by Java (plz, see http://wiki.apache.org/hadoop/WordCount ).
after the last line, "job.waitForCompletion(true);"
I add some code implemented by Jython.
It means the libraries for ... |
I am a bit confused by the Hadoop architecture.
- What kind of file metadata is stored in Hadoop Namenode? From Hadoop wiki, it says Namenode stores the entire system namespace. Does ...
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I'm currently learning hadoop and I'm trying to setup a single node test as defined in http://hadoop.apache.org/common/docs/current/single_node_setup.html
I've configured ssh (I can log without a password).
My server is on our ... |
I'm new to hadoop and is in learning phase.
As per Hadoop Definitve guide, i have set up my hadoop in pseudo distributed mode and everything was working fine. I was even ... |
Exception I am getting is,
2011-07-13 12:04:13,006 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.io.FileNotFoundException: File does not exist: /opt/data/tmp/mapred/system/job_201107041958_0120/j^@^@^@^@^@^@
at org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedSetPermission(FSDirectory.java:544)
at ...
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I am new in hadoop so I have some doubts. If the master-node fails what happened the hadoop cluster? Can we recover that node without any lose? Is it possible to ... |
I am configuring hadoop on clusters.
All node started successfully, but secondary node failed doCheckpoint with following log:
2011-10-25 11:09:07,207 ERROR org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Exception in doCheckpoint:
2011-10-25 11:09:07,208 ERROR org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: java.io.IOException: Server returned HTTP ...
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This is both a general question about java EOF exceptions, as well as Hadoop's EOF exception which is related to jar interoperability. Comments and answers on either topic are acceptable. ... |
I was using Hadoop in a pseudo-distributed mode and everything was working fine.But then I had to restart my computer because of some reason.And now when I am trying to start ... |