This is the first in a series of posts on Cassandra data modeling, implementation, operations, and related practices that guide our Cassandra utilization at eBay. Some of these best practices we’ve learned from public forums, many are new to us, and a few still are arguable and could benefit from further experience. In this part, I’ll cover a few basic practices and walk through a detailed example. Even if you don’t know anything about Cassandra, you should be able to follow almost everything. A few words on Cassandra @ eBay We’ve been trying out Cassandra for more than a year. Cassandra is now serving a handful of use cases ranging from write-heavy logging and tracking, to mixed workload. One of them serves our “Social Signal” project, which enables like/own/want features on eBay product pages. A few use cases have reached production, while more are in development. Our Cassandra deployment is not huge, but it’s growing at a healthy pace. In the past couple of months, we’ve deployed dozens of nodes across several small clusters spanning multiple data centers. You may ask, why multiple clusters? We isolate clusters by functional area and criticality. Use cases with similar criticality from the same functional area share the same cluster, but reside in different keyspaces. RedLaser, Hunch, and other eBay adjacencies are also trying out Cassandra for various purposes. In addition to Cassandra, we also utilize MongoDB and HBase. I won’t discuss these now, but suffice it to say we believe each has its own merit. I’m sure you have more questions at this point. But I won’t tell you the full story yet. At the upcoming Cassandra summit, I’ll go into detail about each use case, the data model, multi- datacenter deployment, lessons learned, and more. The focus of this post is Cassandra data modeling best practices that we follow at eBay. So, let’s jump in with a few notes about terminology and representations I’ll be using for each post in this series. To read more ebaytechblog/2012/07/16/cassandra-data-modeling-best-practices-part-1/
Posted on: Sat, 28 Jun 2014 04:03:27 +0000
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