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## Overview
The Apache Hadoop software library is a framework that allows for the
distributed processing of large data sets across clusters of computers
using a simple programming model.
This charm deploys a compute / slave node running the NodeManager
and DataNode components of
[Apache Hadoop 2.4.1](http://hadoop.apache.org/docs/r2.4.1/),
which provides computation and storage resources to the platform.
## Usage
This charm is intended to be deployed via one of the
[apache bundles](https://jujucharms.com/u/bigdata-dev/#bundles).
For example:
juju quickstart u/bigdata-dev/apache-analytics-sql
This will deploy the Apache Hadoop platform with Apache Hive available to
perform SQL-like queries against your data.
You can also manually load and run map-reduce jobs via the plugin charm
included in the bigdata bundles linked above:
juju scp my-job.jar plugin/0:
juju ssh plugin/0
hadoop jar my-job.jar
### Scaling
The compute-slave node is the "workhorse" of the Apache Hadoop platform.
To scale your deployment's performance, you can simply add more compute-slave
units. For example, to add three mode units:
juju add-unit compute-slave -n 3
## Deploying in Network-Restricted Environments
The Apache Hadoop charms can be deployed in environments with limited network
access. To deploy in this environment, you will need a local mirror to serve
the packages and resources required by these charms.
### Mirroring Packages
You can setup a local mirror for apt packages using squid-deb-proxy.
For instructions on configuring juju to use this, see the
[Juju Proxy Documentation](https://juju.ubuntu.com/docs/howto-proxies.html).
### Mirroring Resources
In addition to apt packages, the Apache Hadoop charms require a few binary
resources, which are normally hosted on Launchpad. If access to Launchpad
is not available, the `jujuresources` library makes it easy to create a mirror
of these resources:
sudo pip install jujuresources
juju-resources fetch --all /path/to/resources.yaml -d /tmp/resources
juju-resources serve -d /tmp/resources
This will fetch all of the resources needed by this charm and serve them via a
simple HTTP server. The output from `juju-resources serve` will give you a
URL that you can set as the `resources_mirror` config option for this charm.
Setting this option will cause all resources required by this charm to be
downloaded from the configured URL.
You can fetch the resources for all of the Apache Hadoop charms
(`apache-hadoop-hdfs-master`, `apache-hadoop-yarn-master`,
`apache-hadoop-hdfs-secondary`, `apache-hadoop-plugin`, etc) into a single
directory and serve them all with a single `juju-resources serve` instance.
## Contact Information
- <bigdata-dev@lists.launchpad.net>
## Hadoop
- [Apache Hadoop](http://hadoop.apache.org/) home page
- [Apache Hadoop bug trackers](http://hadoop.apache.org/issue_tracking.html)
- [Apache Hadoop mailing lists](http://hadoop.apache.org/mailing_lists.html)
- [Apache Hadoop Juju Charm](http://jujucharms.com/?text=hadoop)
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