Introduction Starting and stopping services is a common part of Hadoop administration. Hadoop Region Server Start a Region Server sudo service hbase-regionserver start Stop a Region Server sudo service hbase-regionserver stop Check the Status of a Region Server sudo service hbase-regionserver status
Introduction Zookeeper provides cluster management for Hadoop. In this post, I’m going to install Zookeeper in Pseudo mode, so please use these instructions for setting up a developer’s workstation, not for a production cluster. Installation The zookeeper package should already be installed, but we’ll double check. sudo apt-get install zookeeper Next, we’ll install the Zookeeper …
Introduction You will need to know the location of binaries, configuration files, and libraries when working with HBase. Directories Configuration /etc/hbase/conf is the location for all of HBase’s configuration files. HBase uses Debian Alternatives, so there are a number of symlinks to the configuration files. /etc/hbase/conf is a symlink to /etc/alternatives/hbase-conf. /etc/alternatives/hbase-conf is a symlink …
Introduction You will need to know the location of binaries, configuration files, and libraries when working with Zookeeper. Zookeeper 3.4.3 is a part of Cloudera Distribution Hadoop (CDH4). Directories /etc/zookeeper/conf /etc/zookeeper/conf is the location for all of Zookeeper’s configuration files. Zookeeper uses Debian Alternatives, so there are a number of symlinks to the configuration files. …
Introduction sed provides a quick and easy way to find and replace text via it’s search command (‘s’). Sample File Copy and paste the following text into a file named practice01.txt. Author: Akbar S. Ahmed Date: July 1, 2012 Subject: Sed sed is an extremely useful Unix/Linux/*nix utility that allows you to manipulate a text …
Introduction sed is short for Stream EDitor, which is a utility that allow you to parse and transform text one line at a time. sed is a useful tool, along with grep and awk, when manipulating text files. It is also often overlooked when working with Hadoop, although the use of sed, awk and grep …
Introduction If you are running Hadoop on a development machine, then it’s likely that you’ll run into a situation where multiple services require port 8080. I recently ran into this issue where both the Pentaho User Console and the Hadoop MapReduce ShuffleHandler were trying to use port 8080. One solution is to change the port …
Introduction Sqoop is a tool to import data from an SQL database into Hadoop and/or export data from Hadoop into an SQL database. Sqoop can import/export from HDFS, HBase and Hive. It’s extremely common to use SQL databases as part of the setup in for Hadoop. Often, a SQL database will serve as an upstream …
Introduction These instructions cover a manual installation of the Cloudera CDH4 packages on Ubuntu 12.04 LTS and are based on my following the Cloudera CDH4 Quick Start Guide (CDH4_Quick_Start_Guide_4.0.0.pdf). Installation prerequisites sudo apt-get install curl Verify that Java is installed correctly First, check that Java is setup correctly for your account. echo $JAVA_HOME The output …
Introduction This is my personal .bash_aliases file that is mainly used for Cloudera CDH4 (Hadoop) and Pentaho. As a result, many of my aliases are specific to these software packages. I plan to update this post as my .bash_aliases file expands. I will also push my .bash_aliases file into Git to make it easier to …
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