fix(pd): resolve hostname entries in IpAuthHandler allowlist#2962

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bitflicker64 wants to merge 7 commits intoapache:masterfrom

bitflicker64:fix-ipauthhandler-dns-resolution

Commits on Mar 5, 2026

Fix #2960: resolve hostname allowlist entries in IpAuthHandler at startup to avoid Netty DNS blocking
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Commits on Mar 11, 2026

Fix IpAuthHandler hostname resolution and refresh allowlist after peer changes
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Commits on Mar 15, 2026

fix: refresh IpAuthHandler allowlist via updatePdRaft() bypass path
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Add TODO notes documenting current PD authentication limitations
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fix(test): add regression test for changePeerList -> IpAuthHandler.refresh() wiring
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Commits on Mar 16, 2026