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Unlike other ZAP consumers due to compression DDT does not know how big entry it is reading from ZAP. Due to this it called zap_length_uint64_by_dnode() and zap_lookup_uint64_by_dnode(), each of which does full ZAP entry lookup. Introduction of the combined ZAP method dramatically reduces the CPU overhead and locks contention at DBUF layer. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #18048