apache hadoop client #0

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Description

Hadoop is a software platform that lets one easily write and run applications that process vast amounts of data. This charm manages a dedicated client node as a place to run mapreduce jobs. It can also host client services, such as Apache Hive or Apache Pig, which require access to Apache Hadoop.


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 client node running Apache Hadoop 2.4.1 from which workloads can be run, either manually or via workload charms.

Usage

This charm is intended to be deployed via one of the bundles. For example:

juju quickstart u/bigdata-dev/apache-analytics-sql

This will deploy the Apache Hadoop platform with a single client 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 on the same client:

juju deploy cs:~bigdata-dev/apache-pig pig
juju add-relation client pig

Note that horizontally scaling client nodes with juju add-unit will also replicate all of the node's associated workload charms, since they are subordinates. While this can be useful to provide HA fail-over, if you actually intend to have separate client nodes for, e.g., Apache Hive and Apache Pig, you should instead deploy a separate instance of apache-hadoop-client:

juju deploy cs:~bigdata-dev/apache-hadoop-client pig-client
juju add-relation pig-client yarn-master
juju add-relation pig-client hdfs-master
juju deploy cs:~bigdata-dev/apache-pig pig
juju add-relation pig-client pig

You can also manually load and run map-reduce jobs via the client:

juju scp my-job.jar client/0:
juju ssh client/0
hadoop jar my-job.jar

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.

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 apache-hadoop-client/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. You can then set the resources_mirror config option to have the charm use this server for retrieving resources.

You can fetch the resources for all of the Apache Hadoop charms (apache-hadoop-hdfs-master, apache-hadoop-yarn-master, apache-hadoop-compute-slave, apache-hadoop-client, etc) into a single directory and serve them all with a single juju resources serve instance.

Contact Information

Hadoop


Configuration

resources_mirror
(string) URL from which to fetch resources (e.g., Hadoop binaries) instead of Launchpad.