Redis SET NX + TTL
SET lock:x id EX 30 NX. Atomic. TTL handles crash cleanup. Simple + widely used.
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Redis SET NX + TTL
SET lock:x id EX 30 NX. Atomic. TTL handles crash cleanup. Simple + widely used.
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ZooKeeper ephemeral
Create ephemeral znode. Auto-deleted if client session dies. No TTL guessing.