Rename dns_cache_max_size to dns_cache_max_entries

docs/en/operations/server-configuration-parameters/settings.md

@@ -200,17 +200,17 @@ Type: Bool
 Default: 0
 
 
-## dns_cache_max_size
+## dns_cache_max_entries
 
-Internal DNS cache max size in bytes.
+Internal DNS cache max entries.
 
 :::note
 ClickHouse also has a reverse cache, so the actual memory usage could be twice as much.
 :::
 
 Type: UInt64
 
-Default: 1048576
+Default: 10000
 
 
 ## dns_cache_update_period

docs/en/operations/system-tables/dns_cache.md

@@ -33,6 +33,6 @@ Result:
 **See also**
 
 - [disable_internal_dns_cache setting](../../operations/server-configuration-parameters/settings.md#disable_internal_dns_cache)
-- [dns_cache_max_size setting](../../operations/server-configuration-parameters/settings.md#dns_cache_max_size)
+- [dns_cache_max_entries setting](../../operations/server-configuration-parameters/settings.md#dns_cache_max_entries)
 - [dns_cache_update_period setting](../../operations/server-configuration-parameters/settings.md#dns_cache_update_period)
 - [dns_max_consecutive_failures setting](../../operations/server-configuration-parameters/settings.md#dns_max_consecutive_failures)

docs/en/sql-reference/statements/system.md

@@ -68,7 +68,7 @@ RELOAD FUNCTION [ON CLUSTER cluster_name] function_name
 
 Clears ClickHouse’s internal DNS cache. Sometimes (for old ClickHouse versions) it is necessary to use this command when changing the infrastructure (changing the IP address of another ClickHouse server or the server used by dictionaries).
 
-For more convenient (automatic) cache management, see disable_internal_dns_cache, dns_cache_max_size, dns_cache_update_period parameters.
+For more convenient (automatic) cache management, see disable_internal_dns_cache, dns_cache_max_entries, dns_cache_update_period parameters.
 
 ## DROP MARK CACHE
 

programs/server/Server.cpp

@@ -1774,7 +1774,7 @@ try
     }
     else
     {
-        DNSResolver::instance().setCacheMaxSize(server_settings.dns_cache_max_size);
+        DNSResolver::instance().setCacheMaxEntries(server_settings.dns_cache_max_entries);
 
         /// Initialize a watcher periodically updating DNS cache
         dns_cache_updater = std::make_unique<DNSCacheUpdater>(

src/Common/DNSResolver.cpp

@@ -289,10 +289,10 @@ void DNSResolver::setDisableCacheFlag(bool is_disabled)
     impl->disable_cache = is_disabled;
 }
 
-void DNSResolver::setCacheMaxSize(const UInt64 cache_max_size)
+void DNSResolver::setCacheMaxEntries(const UInt64 cache_max_entries)
 {
-    impl->cache_address.setMaxSizeInBytes(cache_max_size);
-    impl->cache_host.setMaxSizeInBytes(cache_max_size);
+    impl->cache_address.setMaxSizeInBytes(cache_max_entries);
+    impl->cache_host.setMaxSizeInBytes(cache_max_entries);
 }
 
 String DNSResolver::getHostName()

src/Common/DNSResolver.h

@@ -52,8 +52,8 @@ class DNSResolver : private boost::noncopyable
     /// Disables caching
     void setDisableCacheFlag(bool is_disabled = true);
 
-    /// Set a limit of cache size in bytes
-    void setCacheMaxSize(const UInt64 cache_max_size);
+    /// Set a limit of entries in cache
+    void setCacheMaxEntries(const UInt64 cache_max_entries);
 
     /// Drops all caches
     void dropCache();

src/Core/ServerSettings.h

@@ -81,7 +81,7 @@ namespace DB
     M(UInt64, mmap_cache_size, DEFAULT_MMAP_CACHE_MAX_SIZE, "A cache for mmapped files.", 0) \
     \
     M(Bool,   disable_internal_dns_cache, false, "Disable internal DNS caching at all.", 0) \
-    M(UInt64, dns_cache_max_size, (1024 * 1024), "Internal DNS cache max size in bytes.", 0) \
+    M(UInt64, dns_cache_max_entries, 10000, "Internal DNS cache max entries.", 0) \
     M(Int32,  dns_cache_update_period, 15, "Internal DNS cache update period in seconds.", 0) \
     M(UInt32, dns_max_consecutive_failures, 10, "Max DNS resolve failures of a hostname before dropping the hostname from ClickHouse DNS cache.", 0) \
     \