![]() ![]() } # Add Hadoop bin/ directory to PATH export PATH = $PATH: $HADOOP_HOME/bin Hadoop fs -cat $1 | lzop -dc | head -1000 | less # Some convenient aliases and functions for running Hadoop-related commands unalias fs &> /dev/nullĪlias fs = "hadoop fs" unalias hls &> /dev/nullĪlias hls = "fs -ls" # If you have LZO compression enabled in your Hadoop cluster and # compress job outputs with LZOP (not covered in this tutorial): # Conveniently inspect an LZOP compressed file from the command # line run via: # $ lzohead /hdfs/path/to/lzop/compressed/file.lzo # Requires installed 'lzop' command. # Set JAVA_HOME (we will also configure JAVA_HOME directly for Hadoop later on) export JAVA_HOME =/usr/lib/jvm/java-6-sun # $HOME/.bashrc # Set Hadoop-related environment variables export HADOOP_HOME =/usr/local/hadoop To disable IPv6 on Ubuntu 10.04 LTS, open /etc/nf in the editor of your choice and add the following Hence, I simplyĭisabled IPv6 on my Ubuntu machine. ![]() No practical point in enabling IPv6 on a box when you are not connected to any IPv6 network. Options will result in Hadoop binding to the IPv6 addresses of my Ubuntu box. One problem with IPv6 on Ubuntu is that using 0.0.0.0 for the various networking-related Hadoop configuration Made any changes to the SSH server configuration file, you can force a configuration reload with (which should be set to yes) and AllowUsers (if this option is active, add the hduser user to it). Check the SSH server configuration in /etc/ssh/sshd_config, in particular the options PubkeyAuthentication.Enable debugging with ssh -vvv localhost and investigate the error in detail.Ubuntu 10.04 the SSH connect should fail, these general tips might help: Warning: Permanently added 'localhost' (RSA) to the list of known hosts. 14:15:37,572 INFO .hadoop.The authenticity of host 'localhost (::1)' can't be established. 14:15:37,572 INFO. – MR plan size before optimization: 3 ![]() 14:15:37,546 INFO. – Choosing to move algebraic foreach to combiner ![]() 14:15:37,474 INFO. – File concatenation threshold: 100 optimistic? false #Apache hadoop installation on ubuntu installInstall and Use the ShareLibīy default, the ShareLib should be placed in the home folder in HDFS of the user who started the Oozie web server this is not necessarily the same user as the one submitting a job. The property in oozie-site.xml for setting the location of the ShareLib is called .libpath and its default value is /user/$ The ShareLib behaves very similarly to oozie.libpath, except that it’s specific to the aforementioned actions and their required JARs. This is the simplest approach.Īlternatively, we can use the oozie.libpath property in our job.properties file to specify additional HDFS directories (multiple directories can be separated by a comma) that contain JARs. The advantage of using this property over the lib folder discussed above is in cases where we have many workflows all using the same set of JARs. The first approach is based on the fact that a workflow typically consists of a job.properties file, a workflow.xml file, and an optional lib folder (and perhaps other files such as Pig scripts). Oozie will take any of the JARs that we put in that lib folder and automatically add them to our workflow’s classpath when it’s executed. There are two ways to let Oozie know about Mapper and Reducer classes or any other additional JARs required by our workflow. we want to specify our own Mapper and Reducer classes, but how does Oozie know where to find those two classes? Suppose we have an Oozie workflow that runs a MapReduce action. #Apache hadoop installation on ubuntu full
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