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Rewrite the QID lookup table to cds_lfht

Ondřej Surý requested to merge ondrej/use-cds_lfht-for-dns_dispatch into main

Looking up unique message ID in the dns_dispatch has been using custom hash tables. Rewrite the custom hashtable to use cds_lfht API, removing one extra lock in the cold-cache resolver hot path.

Edited by Ondřej Surý

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