Kqr Row Cache Contention Check Gets «PREMIUM – HANDBOOK»
Professional Kitchen & Wardrobe Design Software. KDMAX is simple and affordable Powerful Design Software.
Professional Kitchen & Wardrobe Design Software. KDMAX is simple and affordable Powerful Design Software.
— KQR had a little-known diagnostic command:
def get(key): if key in cache: return cache[key] else: // Only one thread goes to DB; others wait for its result return cache.load_or_wait(key) Within 30 seconds, the contention ratio dropped from 1.00 to 0.001.
— KQR’s row cache for item:42 expired. 9:00:02 — 10,000 concurrent GET requests arrived simultaneously.
KQR had a job: cache frequently accessed rows so the main disk could rest. For years, this worked beautifully. Until .
, the on-call engineer, saw the alert: kqr row cache contention check gets = CRITICAL She’d seen this before. It wasn’t a database problem — it was a thundering herd problem.
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— KQR had a little-known diagnostic command:
def get(key): if key in cache: return cache[key] else: // Only one thread goes to DB; others wait for its result return cache.load_or_wait(key) Within 30 seconds, the contention ratio dropped from 1.00 to 0.001.
— KQR’s row cache for item:42 expired. 9:00:02 — 10,000 concurrent GET requests arrived simultaneously.
KQR had a job: cache frequently accessed rows so the main disk could rest. For years, this worked beautifully. Until .
, the on-call engineer, saw the alert: kqr row cache contention check gets = CRITICAL She’d seen this before. It wasn’t a database problem — it was a thundering herd problem.
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