kapoisu commented on code in PR #46283:
URL: https://github.com/apache/arrow/pull/46283#discussion_r2072853947


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cpp/src/parquet/encryption/two_level_cache_with_expiration.h:
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@@ -110,7 +110,7 @@ class TwoLevelCacheWithExpiration {
     return cache_[access_token].cached_item();
   }
 
-  void CheckCacheForExpiredTokens(double cache_cleanup_period_seconds) {
+  void CheckCacheForExpiredTokens(double cache_cleanup_period_seconds = 0.0) {

Review Comment:
   The parameter indicates that at least cache_cleanup_period_seconds must pass 
before checking the expired tokens. However, the gap between each call is 
undetermined thus the paramater doesn't implies the actual cleanup period. The 
fact that ```CheckCacheForExpiredTokens()``` checks the expired tokens no 
matter how much time has passed seems reasonable to me. Or maybe rename the 
parameter to something else?



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