Kite SDK Examples

The Kite Examples project provides examples of how to use the Kite SDK.

Each example is a standalone Maven module with associated documentation.

Basic Examples

• dataset is the closest to a HelloWorld example of Kite. It shows how to create datasets and perform streaming writes and reads over them.
• dataset-hbase shows how to store entities in HBase using the RandomAccessDataset API.
• dataset-staging shows how to use two datasets to manage Parquet-formatted data
• logging is an example of logging events from a command-line programs to Hadoop via Flume, using log4j as the logging API.
• logging-webapp is like logging, but the logging source is a webapp.

Advanced Examples

• demo is a full end-to-end example of a webapp that logs events using Flume and performs session analysis using Crunch and Hive.

Getting Started

The easiest way to run the examples is on the Cloudera QuickStart VM, which has all the necessary Hadoop services pre-installed, configured, and running locally. See the notes below for any initial setup steps you should take.

The current examples run on version 4.4.0 of the QuickStart VM.

Checkout the latest branch of this repository in the VM:

git clone git://github.com/kite-sdk/kite-examples.git
cd kite-examples

If you are using a prepared Kite VM, the git clone command is already done for you.

Then choose the example you want to try and refer to the README in the relevant subdirectory.

Setting up the QuickStart VM

There are two ways to run the examples with the QuickStart VM:

1. Logged in to the VM guest (username and password are both cloudera).
2. From your host computer.

The advantage of the first approach is that you don't need to install anything extra on your host computer, such as Java or Maven, so there are no extra set up steps.

The second approach is preferable when you want to use tools from your own development environment (browser, IDE, command line). However, there are a few extra steps you need to take to configure the QuickStart VM, listed below.

• Enable port forwarding For VirtualBox, open the Settings dialog for the VM, select the Network tab, and click the Port Forwarding button. Map the following ports - in each case the host port and the guest port should be the same. Also, your VM should not be running when you are making these changes.
  • 7180 (Cloudera Manager web UI)
  • 8020, 50010, 50020, 50070, 50075 (HDFS NameNode and DataNode)
  • 8021 (MapReduce JobTracker)
  • 8888 (Hue web UI)
  • 9083 (Hive/HCatalog metastore)
  • 41415 (Flume agent)
  • 11000 (Oozie server)
  • 21050 (Impala JDBC port)

If you have VBoxManage installed on your host machine, you can do this via command line as well. In bash, this would look something like:

# Set VM_NAME to the name of your VM as it appears in VirtualBox
VM_NAME="QuickStart VM"
PORTS="7180 8020 50010 50020 50070 50075 8021 8888 9083 41415 11000 21050"
for port in $PORTS; do
  VBoxManage modifyvm "$VM_NAME" --natpf1 "Rule $port,tcp,,$port,,$port"
done

• Add a host entry for localhost.localdomain If your host computer does not have a mapping for localhost.localdomain, then add a line like the following to /etc/hosts

127.0.0.1       localhost       localhost.localdomain

• Sync the system clock For some of the examples it's important that the host and guest times are in sync. To synchronize the guest, login and type sudo ntpdate pool.ntp.org.
• Restart the cluster Restart the whole cluster in Cloudera Manager.

Troubleshooting

Working with the VM

• What are the usernames/passwords for the VM?

  • Cloudera manager: 4.4.0: cloudera/cloudera, 4.3.0: admin/admin
  • HUE: cloudera/cloudera
  • Login: cloudera/cloudera

• I can't find the file in VirtualBox (or VMWare)!

  • You probably need to unpack it: In Windows, install 7zip, and extract the VM files from the .7z file. In linux or mac, cd to where you copied the file and run 7zr e cloudera-quickstart-vm-4.3.0-kite-vbox-4.4.0.7z
  • You should be able to import the extracted files to VirtualBox or VMWare

• How do I open a .ovf file?

  • Install and open VirtualBox on your computer
  • Under the menu "File", select "Import..."
  • Navigate to where you unpacked the .ovf file and select it

• What is a .vmdk file?

  • The .vmdk file is the virtual machine disk image that accompanies a .ovf file, which is a portable VM description.

• How do I open a .vbox file?

  • Install and open VirtualBox on your computer
  • Under the menu "Machine", select "Add..."
  • Navigate to where you unpacked the .vbox file and select it

• How do I fix "VTx" errors?

  • Reboot your computer and enter BIOS
  • Find the "Virtualization" settings, usually under "Security" and enable all of the virtualization options

• How do I get my mouse back?

  • If your mouse/keyboard is stuck in the VM (captured), you can usually release it by pressing the right CTRL key. If you don't have one (or that didn't work), then the release key will be in the lower-right of the VirtualBox window

• Other problems

  • Using VirtualBox? Try using VMWare.
  • Using VMWare? Try using VirtualBox.