Kiji Community

Setting up Kiji and HDFS

Install Kiji BentoBox

If you don’t have a working environment yet, install the standalone Kiji BentoBox in three quick steps!

Start a Kiji Cluster

  • If you are running a BentoBox, set the environment variables for the shell and start the Bento cluster:
cd <path/to/bento>
source bin/kiji-env.sh
bento start

After BentoBox starts, it displays ports you need to complete this tutorial. In addition, it will be useful to know the address of the MapReduce JobTracker web app (http://localhost:50030 by default) while working through this tutorial.

  • If you are running Kiji without a BentoBox, there are a few things you’ll need to do to make sure your environment will behave the same way as a BentoBox:

Starting Kiji in Non-BentoBox Systems

  1. Make sure HDFS is installed and started.
  2. Make sure MapReduce is installed, that HADOOP_HOME is set to your MR distribution, and that MapReduce is started.
  3. Make sure HBase is installed, that HBASE_HOME is set to your hbase distribution, and that HBase is started.
  4. Export KIJI_HOME to the root of your kiji distribution.
  5. Export PATH=${PATH}:${KIJI_HOME}/bin.
  6. Export EXPRESS_HOME to the root of your kiji-express distribution.
  7. Export PATH=${PATH}:${EXPRESS_HOME}/bin

When the tutorial refers to the BentoBox, you’ll know that you’ll have to manage your Kiji cluster appropriately.

Set Tutorial-Specific Environment Variables

  • Define an environment variable named KIJI that holds a Kiji URI to the Kiji instance we’ll use during this tutorial:
export KIJI=kiji://.env/kiji_express_music

The code for this tutorial is located in the ${KIJI_HOME}/examples/express-music/ directory. Commands in this tutorial will depend on this location.

  • Set a variable for the tutorial location:
export MUSIC_EXPRESS_HOME=${KIJI_HOME}/examples/express-music

Install Kiji

  • Install your Kiji instance:
kiji install --kiji=${KIJI}

Create Tables

The file music-schema.ddl defines table layouts that are used in this tutorial:

music-schema.ddl

  • Create the Kiji music tables that have layouts described in music-schema.ddl.
kiji-schema-shell --kiji=${KIJI} --file=${MUSIC_EXPRESS_HOME}/music-schema.ddl

This command uses kiji-schema-shell to create the tables using the KijiSchema DDL, which makes specifying table layouts easy. See the KijiSchema DDL Shell reference for more information on the KijiSchema DDL.

  • Verify the Kiji music tables were correctly created:
kiji ls ${KIJI}

You should see the newly-created songs and users tables:

kiji://localhost:2181/express_music/songs
kiji://localhost:2181/express_music/users

Upload Data to HDFS

HDFS stands for Hadoop Distributed File System. If you are running the BentoBox, it is running as a filesystem on your machine atop your native filesystem. This tutorial demonstrates loading data from HDFS into Kiji tables, which is a typical first step when creating KijiExpress applications.

  • Upload the data set to HDFS:
hadoop fs -mkdir express-tutorial
hadoop fs -copyFromLocal ${MUSIC_EXPRESS_HOME}/example_data/*.json express-tutorial/

You’re now ready for the next step, Importing Data.

Kiji Administration Quick Reference

Here are some of the Kiji commands introduced on this page and a few more useful ones:

  • Start a BentoBox Cluster:
cd <path/to/bento>
source bin/kiji-env.sh
bento start
  • Stop your BentoBox Cluster:
bento stop

kiji install --kiji=<URI/of/instance>

The URI takes the form:

kiji://.env/<instance name>

KijiExpress Tutorial

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