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Stop Leaking Trace Context: How to Migrate OpenTelemetry to JDK 26 Scoped Values If you are still relying on traditional ThreadLocal storage for OpenTelemetry context propagation under JDK 26's virtual threads, you are sitting on a production time bomb. Millions of concurrent virtual threads will quickly turn your heap into a graveyard of leaked trace contexts and bloated memory overhead. If you're prepping for interviews, I've been building javalld.com — real machine coding problems with full execution traces. Why Most Developers Get This Wrong Defaulting to ThreadLocal: Assuming the default OpenTelemetry ThreadLocal storage works fine with virtual threads, ignoring the heavy heap footprint and context drift when threads are unmounted and rescheduled. Ignoring Context Leakage: Forgetting that ThreadLocal values persist unless explicitly removed, causing trace data to bleed into unrelated tasks on shared carrier threads. Manual Propagation Mess: Manually passing Span objects down the call stack instead of leveraging JDK 26's native scoped value propagation. The Right Way The clean solution is to bind OpenTelemetry's ContextStorage directly to JEP 487 Scoped Values to enforce immutable, automatic, and thread-safe context propagation across virtual threads and structured concurrency boundaries. Implement Custom ContextStorage: Create an OTel ContextStorage implementation backed by a static ScopedValue<Context> . Enforce Immutability: Leverage the immutable nature of ScopedValue to prevent downstream child threads from accidentally mutating the parent's tracing context. Leverage Structured Concurrency: Use StructuredTaskScope which automatically inherits the scoped trace context without manual boilerplate. Show Me The Code Here is how to run a span using JDK 26 ScopedValue for zero-leak, zero-overhead propagation: public class ScopedTraceRunner { private static final ScopedValue < Span > ACTIVE_SPAN = ScopedValue . newInstance (); public void execute ( Span span , Runn

I’ve been experimenting with automating a few small workflows lately (lead scoring, file handling, etc.) One mistake I keep running into is trying to automate things before the process itself is actually clear. At first it feels productive: - add rules - add scoring - connect tools But over time it just turns into: - patching edge cases - fixing broken inputs - adding more conditions to handle weird situations At some point I realized the problem wasn’t the automation, it was that I didn’t really have a clean “manual logic” to begin with. Once I stepped back and tried to define the process in simple human terms, everything got easier: fewer rules, less complexity, way more stable Feels like automation doesn’t fix messy processes, it just exposes them faster. Curious if others ran into the same thing or if I’m overthinking it. submitted by /u/huncho-mohammed [link] [留言]

Channel Frekuensi (MHz) 1 2412 2 2417 3 2422 4 2427 5 2432 6 2437 7 2442 8 2447 9 2452 10 2457 11 2462 12 2467 13 2472 14 2484 Catatan: Channel yang tidak tumpang tindih adalah channel 1, 6, dan 11. Channel 12 dan 13 legal di Indonesia dan Eropa, tetapi dilarang di Amerika Serikat. Channel 14 hanya digunakan di Jepang, tepatnya pada standar 802.11b .

Qisquiz: A Qiskit v2.X Certification Prep App I built Qisquiz , a web app for learning Qiskit v2.X and preparing for the IBM Certified Quantum Computation using Qiskit v2.X Developer - Associate certification exam. You can try the app here: https://qisquiz.vercel.app/ The GitHub repository is here: https://github.com/dorakingx/qisquiz The concept of Qisquiz is simple: Master Qiskit, one quiz at a time. In other words, Qisquiz is a quiz-based certification prep app that helps learners study Qiskit one question at a time. The target exam is: Exam C1000-179: Fundamentals of Quantum Computing Using Qiskit v2.X Developer Why I Built Qisquiz Qiskit is one of the most important development tools for learning and building quantum computing applications. It is useful for creating quantum circuits, running simulations, using IBM Quantum hardware, and experimenting with quantum algorithms. However, Qiskit v2.X includes several APIs and concepts that learners need to understand carefully. For example, certification prep requires knowledge of topics such as: Qiskit Runtime SamplerV2 EstimatorV2 PUBs, or Primitive Unified Blocs BackendV2 backend.target Transpilation ISA circuits Dynamic circuits OpenQASM 3 Result object handling Little-endian and big-endian interpretation These topics can be learned by reading documentation, but I felt that active practice through quizzes is especially useful for exam preparation. That is why I built Qisquiz , a quiz-based learning app focused on Qiskit v2.X. What Is Qisquiz? Qisquiz is an independent quiz-based learning app for Qiskit v2.X. The current version is organized around the 8 sections of the IBM Qiskit v2.X Developer certification exam. The current question bank includes: 120 original questions 44 code-based questions 40 hard questions 8 sections 15 questions per section Qisquiz is not an official IBM or Qiskit product. It is an independent learning tool that I built to help myself and other learners prepare more effectively. Covered E

Im a freshman college student, for a credit, I have to intern at an NGO and do community outreaches The one that I'm fixed to join asked me to revamp their website, understandable since I'm an engineering student, except i only have minimal knowledge. I'm interning for a month and would really like to learn this into a learning lesson but as of now, im extremely overwhelmed and have no idea where to start. All I've done is very basic HTML, CSS and JAVASCRIPT, nothing practical on an actual website. I would really really appreciate any help with how to approach this challenge. All help would be appreciated, thank you submitted by /u/Internal_Sector_1802 [link] [留言]