typescript
8 minTypeScript async iterators: connect pull-based demand to resource cleanup
Use for-await consumption, cancellation, and iterator return semantics without hiding queues.
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22 matching resultsArticles and interview answers
Q&A
Q&AWhy can a long PostgreSQL transaction delay vacuum cleanup?
An old transaction snapshot may still need row versions that newer transactions have replaced.
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PostgreSQL MVCC keeps row versions visible to active snapshots. A long-running transaction can hold an old snapshot open, so vacuum cannot yet remove some dead versions. Bound transaction lifetimes and investigate idle-in-transaction sessions when table bloat grows.
unix
9 minLinux Disk Full Errors: Blocks, Inodes, Deleted Files, and Safe Cleanup
Diagnose ENOSPC when disk usage looks confusing, including exhausted inodes and deleted files still held open.
kubernetes
8 minKubernetes finalizers: deletion is a protocol, not a cleanup callback
Follow deletion timestamps and controller-owned finalizer removal without hiding leaked resources.
Q&A
Q&AWhy can a Kubernetes object remain after deletion was requested?
A controller has not removed its finalizer after completing external cleanup.
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The API server records deletion and retains the object while finalizers remain. The owning controller must retry idempotent cleanup and remove only its own finalizer after confirmed completion.
python
8 minPython TaskGroups: make sibling failure and cleanup part of the design
Understand structured task lifetimes, cancellation, and grouped failures in asyncio.
Q&A
Q&AWhat should an async Python task do when it receives cancellation?
Release owned resources in cleanup and normally propagate cancellation after cleanup.
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Cancellation is delivered at an await point. Use finally blocks or async context managers to close resources, then re-raise CancelledError unless there is a deliberate reason to suppress it. A blocking synchronous call may not respond promptly, so keep the event loop cooperative and bound background work.
Q&A
Q&AWhat does an asyncio TaskGroup do after a child fails?
It cancels unfinished siblings, waits for cleanup, and surfaces failures as a group.
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Child cancellation is cooperative, so cleanup must run and cancellation should normally be re-raised. A task group scopes lifetimes; it does not roll back remote effects or make partial success a business policy.