Antalya 26.6: Cache vended credentials for REST catalogs - #2156
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…solution in next commit)
Kept only the source PR's own additions in the conflicted regions; the surrounding "theirs" context (stateless-worker ProfileEvents, the `initializeOrLeaveUnavailable` catalog loading path, and the `ALTER DATABASE ... MODIFY SETTING` / `CatalogState` machinery) belongs to other upstream PRs that are not on antalya-26.6. Adapted: DatabaseDataLake::getCatalog reads vended_credentials_cache_ttl from the plain `settings` member, because antalya-26.6 has no MultiVersion<DatabaseDataLakeSettings> database_settings Dropped: catalog auth-state invalidation of the vended credentials cache (cacheCredentials state-snapshot check and the commitSettingsChanges cache clear) - depends on the RestCatalog CatalogState/prepareSettingsChanges machinery not yet on antalya-26.6
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Add option to cache vended credentials for REST catalogs; add a setting
vended_credentials_cache_ttl(seconds). 300 by default. 0 means no caching (ClickHouse#107960 by @zvonand).Cherry-picked from ClickHouse#107960.
Now, new vended credentials are requested on each metadata request. This PR adds an (optional) cache for creds with configurable TTL.