12094457955_475052798c_zIt may not have the name recognition or momentum of Hadoop. But Hydra, the distributed task processing system first developed six years ago by the social bookmarking service maker AddThis, is now available under an open source Apache license, just like Hadoop. And according to Hydra’s creator, the multi-headed platform is very good at some big data tasks that the yellow pachyderm struggles with–namely real-time processing of very big data sets.

Hydra is a big data storage and processing platform developed by Matt Abrams and his colleagues at AddThis (formerly Clearspring), the company that develops the Web server widgets that allow visitors to easily share something via their Twitter, Facebook, Pintrest, Google+, or Instagram accounts.

When AddThis started scaling up its business in the mid-2000s, it got flooded with data about what users were sharing. The company needed a scalable, distributed system that could deliver real-time analysis of that data to its customers. Hadoop wasn’t a feasible option at that time. So it built Hydra instead.

So, what is Hydra? In short, it’s a distributed task processing system that supports streaming and batch operations. It utilizes a tree-based data structure to store and process data across clusters with thousands of individual nodes. It features a Linux-based file system, which makes it compatible with ext3, ext4, or even ZFS. It also features a job/cluster management component that automatically allocates new jobs to the cluster and rebalance existing jobs. The system automatically replicates data and handles node failures automatically.

The tree-based structure allows it to handle streaming and batch jobs at the same time. In his January 23 blog post announcing that Hydra is now open source, Chris Burroughs, a member of AddThis’ engineering department, provided this useful description of Hydra: “It ingests streams of data (think log files) and builds trees that are aggregates, summaries, or transformations of the data. These trees can be used by humans to explore (tiny queries), as part of a machine learning pipeline (big queries), or to support live consoles on websites (lots of queries).”

Hydra was originally developed to help AddThis answer questions about its data, for internal use as well as a service to website operators. Examples of typical questions include “How many unique visitors did I have last month?” and “How many page views did we get from [enter country, Web browser, etc.)?”

Hydra can be downloaded from its GitHub page. Read more

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