Osprey event engine for real-time rule processing
Osprey event engine: how real-time event processing and rule evaluation work under high load, and what architectural trade-offs are hidden within the system
Highload
Highload on ThecoreGrid focuses on designing and operating systems that handle massive scale, traffic, and data under strict reliability requirements.
We explore architectures and patterns for horizontal scaling, load distribution, fault tolerance, and performance optimization in distributed environments. Topics include sharding, replication, caching strategies, queueing systems, backpressure handling, and latency reduction under peak load. We analyze real-world trade-offs between consistency, availability, and cost, along with failure scenarios and recovery strategies. Content is grounded in BigTech practices, including incident post-mortems and lessons from operating systems at global scale. You’ll find deep dives into infrastructure behavior, traffic management, autoscaling, and resilience engineering. Instead of simplified guides, the Highload tag delivers practical engineering insights for backend engineers, architects, platform teams, and SREs responsible for building and maintaining systems that must perform reliably under extreme demand.
ParaQAOA Accelerates QAOA for Max-Cut
arXiv is the largest open preprint repository (since 1991, under the auspices of Cornell), where researchers quickly post working versions of papers; the materials are publicly accessible but do not undergo full peer review, so results should be considered preliminary and, where possible, checked against updated versions or peer‑reviewed journals.
Mid-path Network Analysis through A/B Route Comparison
Mid-path network analysis through A/B comparison reveals bottlenecks in interconnection, hidden behind traditional metrics of latency and throughput.
Edge error handling without failure data
Edge error handling: why CDN failures without logs block diagnostics and how to build observability for analyzing such incidents
OpenShift Virtualization 4.21 Enhances VM Management
OpenShift Virtualization 4.21: how to simplify VM management and reduce complexity in hybrid cloud
Tracing in the actor model without degradation through Envelope
In actor systems, there is no built-in channel for trace context. Discord solved this without changing the architecture and without stopping production.
Latency-aware proxy vs DNS: how to balance S3 load
DNS round-robin stops working under load when clients start caching responses. Agoda faced this issue at the object storage level and moved the balancing to a separate layer. The problem manifested during the increase in data workloads. S3-compatible endpoints used DNS round-robin to distribute traffic. In practice, clients cached DNS responses and continued to hit … Read more
Decomposing round-trip latency: how to separate database delays from network and middleware overhead
Request timeouts do not always indicate a problem in the database. Often, degradation is hidden in the path between the application and the DB. The problem manifests when database metrics appear stable, but clients experience timeouts. At the observation level, this looks like a contradiction: latency increases while database time remains the same. The reason … Read more
Kubernetes fsGroup as a Hidden Bottleneck: Accelerating Restarts through fsGroupChangePolicy
A long restart of a stateful service rarely appears to be a security configuration issue. However, this is how the safe default in Kubernetes turned into 30 minutes of downtime for each restart. The problem manifested at scale. Atlantis, which manages Terraform through GitLab MR, operates as a singleton StatefulSet and stores state in a … Read more
eBPF Profiling in Go: How Symbolization via gopclntab Transforms Addresses into Functions
The profiler in kernel space only sees addresses. Useful insights emerge only after symbolization—and in Go, this stage is structured differently than in other languages. The problem arises when the profile has already been collected, but it cannot be interpreted. The eBPF profiler captures stack traces at the kernel level and obtains a set of … Read more