db/state: replace ExistenceFilterOnAppMemory with ExistenceFilterMode enum#21788
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db/state: replace ExistenceFilterOnAppMemory with ExistenceFilterMode enum#21788AskAlexSharov wants to merge 1 commit into
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… enum Introduce ExistenceFilterMode (InMem=0, WillNeed=1, Normal=2, Random=3) on DomainCfg instead of a bool. Zero value (InMem) is the common case, so no schema lines are needed for the default. All four debug env vars are now per-domain name lists: DOMAIN_EXISTENCE_MEM=accounts,storage — override to InMem DOMAIN_EXISTENCE_WILLNEED=accounts — override to WillNeed DOMAIN_EXISTENCE_NORMAL=accounts — override to Normal DOMAIN_EXISTENCE_RANDOM=accounts — override to Random MadvRandom plumbed through fusefilter.Reader, fusefilter.ReaderSharded, existence.Filter, and recsplit.Index.
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Cherry-pick of #21776 to main.