advancedMultithreading & Concurrency377 of 436
Duplicate orders appear under high traffic though the code shows no obvious race. How do you investigate synchronization, DB constraints, isolation levels, idempotency and distributed concurrency?
Tests whether you systematically check layer by layer -- in-JVM synchronization (useless across instances), DB isolation level (read uncommitted/committed allows double-reads), missing unique constraints, and absent idempotency keys -- instead of assuming the bug is a classic in-memory race.
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