Cloudera Developer Blog · Hue Posts
Hue 2.2 , the open source web-based interface that makes Apache Hadoop easier to use, lets you interact with Hadoop services from within your browser without having to go to a command-line interface. It features different applications like an Apache Hive editor and Apache Oozie dashboard and workflow builder.
This post is based on our “Analyzing Twitter Data with Hadoop” sample app and details how the same results can be achieved through Hue in a simpler way. Moreover, all the code and examples of the previous series have been updated to the recent CDH4.2 release.
Hue is an open-source web interface for Apache Hadoop packaged with CDH that focuses on improving the overall experience for the average user. The Apache Oozie application in Hue provides an easy-to-use interface to build workflows and coordinators. Basic management of workflows and coordinators is available through the dashboards with operations such as killing, suspending, or resuming a job.
Prior to Hue 2.2 (included in CDH 4.2), there was no way to manage workflows within Hue that were created outside of Hue. As of Hue 2.2, importing a pre-existing Oozie workflow by its XML definition is now possible.
How to import a workflow
Hue lets you interact with Hadoop services from within your browser without having to go to a command-line interface. It features a file browser for HDFS, an Apache Oozie Application for creating workflows of data processing jobs, a job designer/browser for MapReduce, Apache Hive and Cloudera Impala query editors, a Shell, and a collection of Hadoop APIs.
For several good reasons, 2013 is a Happy New Year for Apache Hadoop enthusiasts.
In 2012, we saw continued progress on developing the next generation of the MapReduce processing framework (MRv2), work that will bear fruit this year. HDFS experienced major progress toward becoming a lights-out, fully enterprise-ready distributed filesystem with the addition of high availability features and increased performance. And a hint of the future of the Hadoop platform was provided with the Beta release of Cloudera Impala, a real-time query engine for analytics across HDFS and Apache HBase data.
Hue is a web interface for Apache Hadoop that makes common Hadoop tasks such as running MapReduce jobs, browsing HDFS, and creating Apache Oozie workflows, easier. In this post, we’re going to focus on the dynamic workflow builder that Hue provides for Oozie that will be released in Hue 2.2.0 (For a high-level description of Oozie integration in Hue, see this blog post).
Basic Operations on Actions
Hue is a web interface for Apache Hadoop that makes common Hadoop tasks such as running MapReduce jobs, browsing HDFS, and creating Apache Oozie workflows, easier. (To learn more about the integration of Oozie and Hue, see this blog post.) In this post, we’re going to focus on how one of the fundamental components in Hue, Useradmin, has matured.
New User and Permission Features
User and permission management in Hue has changed drastically over the past year. Oozie workflows, Apache Hive queries, and MapReduce jobs can be shared with other users or kept private. Permissions exist at the app level. Access to particular apps can be restricted, as well as certain sections of the apps. For instance, access to the shell app can be restricted, as well as access to the Apache HBase, Apache Pig, and Apache Flume shells themselves. Access privileges are defined for groups and users can be members of one or more groups.
Changes to Users, Groups, and Permissions
Hue is a Web-based interface that makes it easier to use Apache Hadoop. Hue 2.1 (included in CDH4.1) provides a new application on top of Apache Oozie (a workflow scheduler system for Apache Hadoop) for creating workflows and scheduling them repetitively. For example, Hue makes it easy to group a set of MapReduce jobs and Hive scripts and run them every day of the week.
In this post, we’re going to focus on the Workflow component of the new application.
Yesterday’s post gave an overview of the HUE (aka. Hadoop User Experience) project which was released in CDH3b2 and available on github. HUE is a graphical “desktop” style web application that runs in modern browsers (Firefox, Chrome, Safari, and IE8+) that allows users to interact with a Hadoop installation as if it were just another computer. They browse the file system, create and manage user accounts, view and edit files, upload files, and then use some Hadoop-specific applications like the Job Browser and Beeswax (our Hive app). Here’s a quick demo from yesterday’s post running through Beeswax. It’s about 10 minutes long, but even if you only watch the first 2 or 3 you’ll get an idea of what HUE is and what it can do.
This post is focused on what it means to develop for HUE, the source of which is available on github for all your forking pleasure.
Developing For HUE On The Server Side
The HUE (aka. Hadoop User Experience) project [download|installation|manual] started as Cloudera Desktop about a year ago. The old name “Desktop” really refers to a desktop look-and-feel, since HUE is a web UI for Hadoop. Beyond delivering a suite of web applications, it is also a platform for building custom applications with a nice UI library. Gradually, we realized how much value such a UI platform would bring to the community, and I am very excited that Cloudera contributed HUE as an open source project.