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eBay Tech Blog

To support the world’s largest internet marketplace, eBay tackles technical challenges at a scale that few others have. With this blog, we share our experiences working on those challenges with the technical community.

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Optimizing CAL Report Hadoop MapReduce Jobs
By: Wanxue Li

eBay's Central Application Logging system (CAL) collects log data from all kinds of applications. The summary reports for log data are created using Hadoop MapReduce jobs. This article discusses our experiences optimizing these jobs.

Featured Blog Posts

Browse eBay with Style and Speed
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Announcing Kylin: Extreme OLAP Engine for Big Data
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Statistical Anomaly Detection
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Effective Front-End Code Review
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Thinking Inside the Box
By: Dan Slightam

The use of Augmented Reality in mobile app development is gaining momentum very quickly. eBay just introduced its first AR features into the Android mobile app.

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eBay’s Font Loading Strategy
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Browse eBay with Style and Speed
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Performance Tuning on Quartz Scheduler
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Optimizing CAL Report Hadoop MapReduce Jobs
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Finding Desirable Items in eBay Search by a Deep Dive into Skipped Items
By: Ishita Khan

When you search on eBay and there are many matching listings, how does eBay figure out which ones to rank at the top? One key ingredient is to determine how well the listing matches the intent of the query.

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OpenAPI–An eBay Perspective
By: Shekhar Banerjee

Searching for a new specification for our API contracts: the WHYs, WHATs, HOWs on OpenAPI adoption and our journey so far, including feature highlights and a discussion on the exciting possibilities.

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Peer-to-Peer Fundraising on eBay
By: Scott McDowell

For many years, eBay has provided the ability to sell items to benefit a given charity or nonprofit organization through our eBay for Charity program. Now eBay sellers can list an item and have the funds raised credited to their favorite Event, Team, and/or Participant.

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Contextual Advertising for eBay Affiliate Marketing
By: Mukund Thiyagarajan

eBay uses various marketing channels to funnel new and existing customers to the site, and one of them is the eBay affiliate program. This article talks about a way to contextually advertise on our affiliate sites based on the content on the page.

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Faster E-commerce Search
By: Roberto Konow

The search engine plays an essential role in e-Commerce: it connects the user's need with a set of relevant items based on a query. This is not a simple task; millions of queries per second need to be processed over possibly billions of items, and it is expected that every query will be executed in just a few hundred milliseconds using limited resources. In this article, we show how we improved eBay's search engine efficiency by over 25%, inspired by a technique coming from web search.

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