Software-Engineering - Tag - piljoong.devhttps://piljoong.dev/tags/software-engineering/Software-Engineering - Tag - piljoong.devHugo -- gohugo.ioenkpiljoong@gmail.com (piljoong)kpiljoong@gmail.com (piljoong)kpiljoong@gmail.comThu, 11 Jun 2026 03:04:06 +0900Upstream and Downstream Are Not Directionshttps://piljoong.dev/posts/upstream-and-downstream-are-not-directions/Thu, 11 Jun 2026 03:04:06 +0900piljoonghttps://piljoong.dev/posts/upstream-and-downstream-are-not-directions/The incident review started with a sentence that sounded ordinary.

“The downstream service returned bad data.”

Everyone knew what the speaker meant.

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