Hadoop is a software platform that lets one easily write and run applications that process vast amounts of data. This charm provides a simplified connection point for client / workload services, such as Apache Hive or Apache Pig, which require access to Apache Hadoop.
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 plugs in to a workload charm to provide the Apache Hadoop 2.7.1 libraries and configuration for the workload to use.
This charm is intended to be deployed via one of the apache bundles. For example:
juju quickstart apache-analytics-sql
This will deploy the Apache Hadoop platform with a workload node which is running Apache Hive to perform SQL-like queries against your data.
If you wanted to also wanted to be able to analyze your data using Apache Pig, you could deploy it and attach it to the same plugin:
juju deploy apache-pig pig juju add-relation plugin pig
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.
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.
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-plugin, etc) into a single
directory and serve them all with a single
juju-resources serve instance.
- (int) The default block size for new files (default to 128MB). Increase this in larger deployments for better large data set performance.
- (int) Default block replication. The actual number of replications can be specified when the file is created. The default is used if replication is not specified at file creation time.
- (string) Hadoop version
- (string) URL from which to fetch resources (e.g., Hadoop binaries) instead of Launchpad.