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Concurrent Hash Map Designs: Synchronized, Sharding, and ConcurrentHashMap
https://bluuewhale.github.io/posts/concurrent-hashmap-designs/

https://redd.it/1pwr1p2
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Bluue Whale Concurrent Hash Table Designs: Synchronized, Sharding, ConcurrentHashMap, and NonBlockingHashMap A tour of common concurrent hash map designs—global locks, sharding/lock striping, Java's ConcurrentHashMap, and Cliff Click's NonBlockingHashMap (NBHM)—through the lens of contention and performance.
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