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Why naive exponential backoff causes retry storms, and how adding random jitter smooths out the load, with a full-jitter retry implementation in PHP and Python.
How consistent hashing distributes keys across nodes so adding or removing a node only reshuffles a small fraction of the keyspace, with a virtual-node implementation in PHP and Python.
A deep dive into the Redlock algorithm for safe distributed locking across multiple Redis nodes, including failure modes, clock drift, and the fencing token fix.
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