this post was submitted on 25 Nov 2025
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A data ingestion service that was processing ~15 billion logs each day that was duplicating each of those logs 2-4 times in memory as a part of the filtering logic. No particular reason nor need to do it. When I profiled the system it was BY FAR the largest hog of CPU and memory.
The engineer who wrote it once argued with me about writing comparisons a == b vs b == a because one was technically more efficient ... in a language we weren't using.