Switch the pre22 warning to use CopyOnWriteArraySet. #23969
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This data structure is better for cases where writes are rare and reads common. When this warning path is it, the writes only occur exactly once per CVE-affected type, and reads occur once per every parse of those types. Broadly people sensitive by this performance concern should really regen their gencode, but this should help take the edge off of people who first upgrade to 4.x and then look to incrementally regen any ancient gencode. Fixes #23963 PiperOrigin-RevId: 819238880
zhangskz
requested review from
esrauchg and
googleberg
and removed request for
a team
esrauchg
approved these changes
Oct 14, 2025
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This data structure is better for cases where writes are rare and reads common. When this warning path is it, the writes only occur exactly once per CVE-affected type, and reads occur once per every parse of those types.
Broadly people sensitive by this performance concern should really regen their gencode, but this should help take the edge off of people who first upgrade to 4.x and then look to incrementally regen any ancient gencode.
Fixes #23963
PiperOrigin-RevId: 819238880
Cherry-pick of c131253