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Bluesky April 2026 Outage Post-Mortem
Bluesky systems team member Jim published a post-mortem on an April 2026 intermittent outage that affected ~50% of users for 8 hours. The root cause was an unbound concurrency flaw in the GetPostRecord RPC endpoint; when hit by large batch requests from a new internal service, it led to TCP port exhaustion, a logging-induced death spiral, and OOM crashes, with a temporary port expansion stabilizing service before permanent fixes were applied.
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0- First seen
- Apr 10, 2026, 11:51 PM
- Last updated
- Apr 11, 2026, 4:41 AM
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9 tagsBluesky outagepost-mortemTCP port exhaustionunbound concurrencymemcachedOOM crashobservabilityRPC endpointservice stability
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1 evidence itemsBluesky April 2026 Outage Post-Mortem
News · 1Apr 10, 2026, 11:51 PMOpen original source
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Bluesky April 2026 Outage Post-Mortem
Apr 10, 2026, 11:51 PM
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