Reduce the cost of concurrency control for `CollectionShardingState`

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    • Service Arch
    • Fully Compatible
    • v8.0
    • Service Arch 2024-04-29, Service Arch 2024-05-13
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      A stdx::mutex is used to synchronize the hash-map that backs CollectionShardingState and maps a NamespaceString to its corresponding CSSAndLock. This mutex can be replaced with one that is optimized for shared reads and infrequent writes (e.g. SERVER-86656).

              Assignee:
              Amirsaman Memaripour
              Reporter:
              Amirsaman Memaripour
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