unix
5 minUnix Log Sorting: Normalize Offset Timestamps Before Ordering Events
Build a bounded investigation pipeline that preserves malformed records and avoids lexical sorting across mixed offsets.
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30 matching resultsArticles and interview answers
Q&A
Q&AWhy are Kafka offsets and commit timing so important?
Offsets are the durability checkpoint. Commit too early and you lose work; commit too late and you duplicate it.
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Kafka commits represent when the consumer believes work has been finished. If the offset is committed before the business effect is truly durable, a crash can lose data. If it is committed only after a delay, the application may re-process messages when the consumer restarts. The correct strategy is to commit only after the state change is stored successfully and the work is idempotent enough to recover from retries.
Q&A
Q&AWhy can a Python list not be an element of a set?
Set members must be hashable, and a mutable list does not have a stable hash.
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Sets and dictionary keys rely on a stable hash and equality relationship while a value is stored. A list is mutable, so changing it could invalidate the collection’s lookup structure; Python therefore makes lists unhashable. Use a tuple if its members are also hashable and the value should be immutable.
java
9 minJava equals and hashCode: Fix Broken HashMap and HashSet Lookups
Diagnose collection bugs caused by inconsistent equality, mutable keys, inheritance, and accidental identity comparisons.
python
8 minPython Collections: Lists, Tuples, Sets, and Map/Reduce Trade-offs
Choose Python collection types by invariants and access patterns, then use map, comprehensions, and reductions without obscuring intent.
databases
6 minSQL keyset pagination: continue an order without promising a snapshot
Use a unique ordering tuple and a deliberate visibility policy for reliable page traversal.
python
5 minPython Event Times: Normalize Offsets Without Losing Elapsed Time
Build a small timestamp boundary that rejects naive input, normalizes aware values, and measures latency with the right clock.
Q&A
Q&AWhich settings commonly cause 502s during a Kubernetes rolling update?
Readiness, termination grace, endpoint withdrawal, and ingress draining may be misaligned.
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Check whether readiness turns true before the app can serve, whether shutdown stops accepting work too early, and whether terminationGracePeriodSeconds/preStop allow endpoint withdrawal and connection draining. Also inspect maxUnavailable/maxSurge and ingress upstream errors. Correlate events, endpoint changes, and 502 timestamps before tuning a single probe.