Disrupted Splunk at Groupon to save millions and broke a very expensive vendor lock-in. This success story strikes many nerves — driving change, disrupting the status quo, leadership, team building, elevating the underdog, and scaling the transformation exponentially. Getting done in 120 days what Groupon was unable to do for three years before we took on this challenge. — Splunk delivered logging to Groupon since its early startup days. It had grown to a daily ingestion volume of 100TB, with logging volume growing at 20% YoY. At this scale, Splunk was financially unviable. It already cost us millions of dollars in Splunk licensing, data center infrastructure, and operations.