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| Title & Speakers | Event |
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We Hacked Ourselves So You Don't Have To: An Elasticsearch Battle Story
2025-11-12 · 19:00
Maryna Kryvko
– Senior Software Engineer
@ Zalando
,
Ivan Potapov
– Research Engineer
@ Zalando
This talk examines the October 2024 Zalando outage, which resulted in severe revenue impact. The incident was triggered by an automated security scan that uncovered an unprotected GraphQL endpoint. This led to an unexpected amplification of requests, causing computationally expensive queries against the service in front of the search indices and ultimately overloading the Elasticsearch clusters. The prolonged impact highlighted difficulties in pinpointing the root cause of high load in Elasticsearch, and proved that even though a perfect storm is by definition a rare occurrence, it still should never be discarded. Sometimes, when you hear the hoofbeats, they are zebras after all. |
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The Performance Paradox: When Slower Code Doesn't Slow You Down
2025-11-12 · 18:30
Anderson Queiroz
– Senior Software Engineer
@ Elastic
Abstract: We added on-the-fly gzip decompression to Elastic Filebeat and the Elastic Agent—our log collection tools—to enable the ingestion of gzip archives and rotated logs. A performance drop was expected, so we benchmarked the feature only to find that the performance didn't drop at all. This talk is the story of our hunt for a non-existent bottleneck and how a holistic view of application performance uncovered the surprising truth about where the real costs lie. |
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