Copilot commented on code in PR #13042:
URL: https://github.com/apache/trafficserver/pull/13042#discussion_r3012597641


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plugins/header_rewrite/conditions_geo_maxmind.cc:
##########
@@ -23,17 +23,25 @@
 
 #include <unistd.h>
 #include <arpa/inet.h>
+#include <map>
+#include <mutex>
+#include <string>
 
 #include "ts/ts.h"
 
 #include "conditions_geo.h"
 
 #include <maxminddb.h>
 
-MMDB_s *gMaxMindDB = nullptr;
-
 enum class MmdbSchema { NESTED, FLAT };
-static MmdbSchema gMmdbSchema = MmdbSchema::NESTED;
+
+struct MmdbHandle {
+  MMDB_s     db;
+  MmdbSchema schema = MmdbSchema::NESTED;
+};
+
+static std::map<std::string, MmdbHandle *> gMmdbCache;
+static std::mutex                          gMmdbCacheMutex;
 

Review Comment:
   The new MaxMind handle cache stores heap-allocated MmdbHandle instances (and 
their MMDB_s mmaps) for the lifetime of the process, but there is no 
corresponding MMDB_close()/delete path. This can lead to unbounded growth in 
mapped memory / open files if remap instances are recreated over time with 
different --geo-db-path values. Consider adding reference counting and cleanup 
(e.g., close+erase when the last RulesConfig using a path is deleted), or a 
bounded/evicting cache with explicit teardown on shutdown/reload.



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