Processing Streaming Data - Real-Time Analytics - page 186

project includes Samza, ZooKeeper, Kafka, and YARN in a convenient
package for development.
To get started, first check out the hello-samza Git repository from Github.
This repository includes a script that will build and install a complete Samza
installation:
$ git clone https://github.com/apache/
incubator-samza-hello-samza.git
$ cd incubator-samza-hello-samza/
$ ./bin/grid bootstrap
JAVA_HOME Not Set
On some systems, such as Mac OS X, when grid is run, it returns a
JAVA_HOME not set error:
$ ./bin/grid bootstrap
JAVA_HOME not set. Exiting.
On OS X, the following sets the JAVA_HOME environment variable to
the appropriate value:
$ export JAVA_HOME=$(/usr/libexec/java_home)
The first time it is run, the grid script builds and installs Samza into the
local Maven repository. This eliminates the need to check out and build
the git repository separately as indicated in the tutorial on the Samza
website. It also downloads appropriate versions of ZooKeeper and Kafka for
use with Samza and starts them. The build process takes 3 to 5 minutes,
and installing ZooKeeper and Kafka takes a few more minutes depending
on network speeds. The grid application also downloads and installs a
single node version of YARN. This download is around 100MB in size, so
it is usually best to have a decent connection when first installing the Hello
Samza project.
If all has gone well, pointing a web browser at http://localhost:8088 should
show something like Figure 5.6 .