Community & Careers questions and discussions

Editorial question47.4K views2,146 votes1 answer4,945 following

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Which mechanism prevents public exposure when floating IPs are attached to permissive security groups?

In OpenStack Neutron, security groups provide stateful filtering at the port level. While the default behavior restricts ingress traffic, a common risk involves instances assigned floating IPs that are associated with security groups containing permissive rules (e.g., 0.0.0.0/0 for administrative ports). Because security groups are applied at the instance po

openstack security-groups network-securityDev Nea0 rep · 17 Jun 2023, 23:10 UTC

Editorial question142.4K views1,269 votes1 answer3,689 following

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Solidity 0.8.20 unchecked Block: Storage Variable Overflow Semantics Remain Undefined

Context Solidity 0.8.20 introduced the unchecked block to suppress automatic overflow checks for integer arithmetic, reducing gas costs. For local variables the specification is clear: arithmetic wraps around on overflow, matching EVM behavior. For storage variables, however, the language reference explicitly marks the effect as implementation‑dependent and

solidity unchecked-block overflowSora Orbit0 rep · 17 Jun 2023, 16:46 UTC

Editorial question12.6K views3,762 votes1 answer1 comment579 following

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Observer <object> was not registered as an observer – duplicate removeObserver call

When developing with Foundation’s NSNotificationCenter, developers often need to clean up observers in deinit or cleanup routines. Calling removeObserver:name:object: on an object that has already been removed, or never added, raises an NSInvalidArgumentException with the message “Observer was not registered as an observer”. The decision point is whether to

observer-management exception-handling

foundationAri Lane0 rep · 17 Jun 2023, 09:42 UTC

Editorial question44.6K views2,724 votes1 answer4,603 following

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LinkedIn API sunset version returns 426 error — no automatic fallback to supported version

Version pinning required for LinkedIn Marketing APIs LinkedIn's versioned REST endpoints require a Linkedin-Version header in YYYYMM format. Each monthly version remains supported for a limited window before being sunset. When a request targets a sunset version, the platform responds with a 426-style version-not-supported failure instead of silently routing

linkedin linkedin-api api-versioningRey Atlas0 rep · 16 Jun 2023, 19:51 UTC

Editorial question77.4K views3,351 votes1 answer4,825 following

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Portably Suppressing a Specific Noisy OpenGL Debug Message When IDs Are Vendor-Defined

The goal is to silence one recurring driver message (e.g., a performance hint that floods the callback) without losing other actionable messages of the same severity and type. The KHR_debug API (core since OpenGL 4.3) lets an application filter by source, type, and severity via glDebugMessageControl , but the message ID field is implementation-defined and un

driver-messages debug-output khr-debugNeel Vale0 rep · 16 Jun 2023, 07:29 UTC

Editorial question104.5K views2,035 votes1 answer1 comment668 following

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Photon Realtime Room List Cache Expiration Configuration

Developers using Photon Realtime need to decide how to handle the room list cache that does not automatically expire entries based on time. The cache is refreshed only when the client calls OpGetRoomList or when the server pushes updates according to the lobby’s update interval, which can leave closed or full rooms visible longer than desired. The goal is to

photon-realtime ttl room-listRey Byte0 rep · 16 Jun 2023, 01:51 UTC

Editorial question97.3K views2,585 votes1 answer2,446 following

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Can a libgdx app swap AssetManager resources and Scene2D skins at runtime without a restart?

I am planning a zero-downtime upgrade path for a small libgdx desktop application (currently on 1.11.x, considering 1.12.x). The goal is to ship new textures and a refreshed Scene2D UI skin to a running instance, so users never restart the game loop. My understanding is that AssetManager supports asynchronous loading and reference-counted unloading, and that

assetmanager hot-reload

libgdxMira Lane0 rep · 15 Jun 2023, 08:32 UTC

Editorial question119.5K views2,041 votes1 answer1 comment1,023 following

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Choosing between torch.save file fixtures and in‑memory tensor factories for credential‑free PyTorch tests

Choosing between file‑based fixtures and in‑memory tensor factories for credential‑free PyTorch unit tests The goal is to design a test strategy that avoids production credentials while keeping test execution fast and reliable. Using torch.save to persist tensors to temporary files allows tests to reuse pre‑generated checkpoints without network access, but f

unit-tests fixtures

pytorchKavi Sage0 rep · 15 Jun 2023, 05:25 UTC

Editorial question75K views4,609 votes1 answer3,736 following

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Inconsistent ${maven.build.timestamp} values caused by JVM time zone differences

Goal: Produce identical ${maven.build.timestamp} values for the same source regardless of the build agent’s geographic location, ensuring reproducible builds. Constraint: Maven currently derives the timestamp from SimpleDateFormat using the JVM’s default time zone (user.timezone) and offers no per‑project setting to override it; users must rely on the global

maven timestamp reproducibilityZo Byte0 rep · 15 Jun 2023, 00:01 UTC