How ConcurrentHashMap Works Internally

theskilledcoder's tweet image. How ConcurrentHashMap Works Internally

CAS is only used when inserting into an empty bin. Otherwise there is a per bin lock which is used.


The use of CAS is true for some operations in ConcurrentHashMap (e.g., updating counters or small modifications), but for insertions that involve structural changes (like adding to a bucket), a lock is typically acquired to ensure thread safety. A proper explicit lock


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