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Mapreduce Compilation in Java

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http://serverfault.com – I am following this tutorial. http://hadoop.apache.org/docs/mapreduce/current/mapred_tutorial.html javac -classpath ${HADOOP_HOME}/hadoop-core- ${HADOOP_VERSION}.jar:${HADOOP_HOME}/hadoop-mapred-${HADOOP_VERSION}.jar:${HADOOP_HOME}/hadoop-hdfs-${HADOOP_VERSION}.jar -d wordcount_classes The hadoop version is 0.22.0 and this does not have a hadoop-core-0.22.0.jar though I find hadoop-hdfs-0.22.0, hadoop-mapred-0.22.0 jars for now, I wont be able to get any other versions of hadoop.Any help in this would be very useful to me. (HowTos)

grtyyu's picture
Submitted by grtyyu on 01/01/2013

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i want to access hbase table from hadoop mapreduce....i m using windowsXP and cygwin i m using hadoop-0.20.2 and hbase-0.92.0 hadoop cluster is working fine....i am able to run mapreduce wordcount successfully on 3 pc's hbase is also working .....i can cerate table from shell

i have tried many examples but they are not working....when i try to compile it using javac Example.java

it gives error..

Full list of error:

hb@localhost:/etc/hadoop/conf$ sudo service hadoop-hdfs-namenode start * Starting Hadoop namenode: starting namenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-namenode-localhost.out 12/09/10 14:41:09 INFO namenode.NameNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting NameNode STARTUP_MSG: host = localhost/127.0.0.1 S

cp not working in script 42 weeks 3 days ago

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Hey guys Montana here,

I have configured Hadoop for single node cluster, when I run my URLS, the .jsp's they work which means Hadoop is working but upon booting Hadoop by formatting a new distributed filesystem

Code: bin/hadoop namenode -format I get an SSH error, but then when I actually start Hadoop

Code: bin/start-dfs.sh Which should also handle the "${HADOOP_CONF_DIR}&q

Virtualization giant VMware has unveiled Spring Hadoop, which integrates its Spring Framework with the Apache Hadoop platform. Spring provides a comprehensive, lightweight framework that will make it easier for devs to build solutions around the Hadoop platform, according to the company. Spring Hadoop is available under the open source Apache 2.0 license and can be downloaded free.

I am required to hack a single node hadoop "cluster" (cloudera psuedo-distributed) to be able to access it remotely. I have successfully installed hadoop and I have updated the localhost identifiers in the configs to the IP address of the machine. I can run hadoop fs -ls / and all is good. I have created a passphraseless key and I can ssh to the hadoop machine.

I'm trying to run hadoop unit tests using hadoop using MiniDFSCluster,MiniMRCluster and JUnit however I'm getting this error:

WARNING: Metrics system not started: Cannot locate configuration: tried hadoop-metrics2-datanode.properties, hadoop-metrics2.properties Dec 18, 2012 4:42:29 PM org.apache.hadoop.hdfs.server.datanode.DataNode makeInstance WARNING: Invalid directory in dfs.data.dir: Incorre

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Despite an error specified on Error of start of the demon of Namenode with a log of errors me it was succeeded to execute a command

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