python
17 minPython Async Runtime Advanced: GIL, ASGI Lifecycles, and Safe Concurrency
Understand event-loop scheduling, CPU versus I/O concurrency, ASGI worker lifecycles, per-request sessions, and cancellation-safe background work.
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10 matching resultsArticles and interview answers
unix
8 minpipefail, Signals, and Unix Process Management
Unix is full of tiny control primitives. Learn how `set -o pipefail`, process signals, and clean lifecycle management keep shell pipelines reliable and debuggable.
Q&A
Q&AWhy does Spring throw BeanCurrentlyInCreationException for a circular dependency?
The container cannot construct a dependency cycle safely, especially when both beans require constructor injection.
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Bean A needs B while B needs A, so neither constructor can complete first. Treat the exception as an ownership/design signal: extract the shared responsibility, invert a dependency, or communicate through an event. Lazy lookup can defer resolution but does not remove the cycle or its coupling.
Q&A
Q&AHow does the JVM class-loading lifecycle work?
Loading, linking, and initialization are distinct phases managed by class loaders.
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A class loader locates and defines bytecode; linking verifies it, prepares class storage, and resolves symbolic references as needed; initialization runs static initialization in the specified order. Parent delegation is common but custom loaders can change identity: classes with the same name loaded by different loaders are distinct runtime types. Class-loader leaks often arise when long-lived references retain an application loader after redeployment.
python
14 minPython Runtime Advanced: Native Memory, ASGI Lifecycles, and Worker Failure
Debug memory outside Python objects, choose ASGI worker boundaries, and find silent hangs in background consumers.
java
18 minAdvanced Java and Spring: Runtime, Concurrency, Proxies, and Reactive Failure Modes
A production field guide to GC choice, thread-pool saturation, Spring lifecycle traps, AOP boundaries, and blocking work in reactive services.
security
5 minSecurity Boundaries: Object Authorization, Input Validation, and Secret Handling
Enforce access on individual resources, keep data separate from executable structure, and prevent sensitive values from crossing logging and build boundaries.
Q&A
Q&AWhy can a Linux filesystem be full when du shows free space?
Inodes may be exhausted, or deleted files may still be held open by running processes.
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Compare df -h with df -i. If block usage and directory totals disagree, inspect open-but-deleted files with lsof +L1. A process retains allocated blocks until it closes the file; restart or signal the owning service through its safe lifecycle after confirming the file is disposable.