[opt](catalog) modify some meta cache logic

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -1979,16 +1979,20 @@ public class Config extends ConfigBase {
      * Max cache num of hive partition.
      * Decrease this value if FE's memory is small
      */
-    @ConfField(mutable = false, masterOnly = false)
-    public static long max_hive_partition_cache_num = 100000;
+    @ConfField(description = {"Hive Metastore 表级别分区缓存的最大数量。",
+            "Max cache number of partition at table level in Hive Metastore."})
+    public static long max_hive_partition_cache_num = 10000;
 
-    @ConfField(mutable = false, masterOnly = false, description = {"Hive表名缓存的最大数量。",
-            "Max cache number of hive table name list."})
-    public static long max_hive_table_cache_num = 1000;
+    @ConfField(description = {"Hudi/Iceberg 表级别缓存的最大数量。",
+            "Max cache number of hudi/iceberg table."})
+    public static long max_external_table_cache_num = 1000;
 
-    @ConfField(mutable = false, masterOnly = false, description = {
-            "Hive分区表缓存的最大数量", "Max cache number of hive partition table"
-    })
+    @ConfField(description = {"External Catalog 中，Database 和 Table 的实例缓存的最大数量。",
+            "Max cache number of database and table instance in external catalog."})
+    public static long max_meta_object_cache_num = 1000;
+
+    @ConfField(description = {"Hive分区表缓存的最大数量",
+            "Max cache number of hive partition table"})
     public static long max_hive_partition_table_cache_num = 1000;
 
     @ConfField(mutable = false, masterOnly = false, description = {"获取Hive分区值时候的最大返回数量，-1代表没有限制。",

fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java

@@ -238,7 +238,7 @@ public final synchronized void makeSureInitialized() {
                             name,
                             OptionalLong.of(86400L),
                             OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60L),
-                            Config.max_hive_table_cache_num,
+                            Config.max_meta_object_cache_num,
                             ignored -> getFilteredDatabaseNames(),
                             dbName -> Optional.ofNullable(
                                     buildDbForInit(dbName, Util.genIdByName(name, dbName), logType)),
@@ -660,8 +660,6 @@ protected ExternalDatabase<? extends ExternalTable> buildDbForInit(String dbName
                 return new IcebergExternalDatabase(this, dbId, dbName);
             case MAX_COMPUTE:
                 return new MaxComputeExternalDatabase(this, dbId, dbName);
-            //case HUDI:
-                //return new HudiExternalDatabase(this, dbId, dbName);
             case LAKESOUL:
                 return new LakeSoulExternalDatabase(this, dbId, dbName);
             case TEST:

fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalDatabase.java

@@ -145,7 +145,7 @@ public final synchronized void makeSureInitialized() {
                             name,
                             OptionalLong.of(86400L),
                             OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60L),
-                            Config.max_hive_table_cache_num,
+                            Config.max_meta_object_cache_num,
                             ignored -> listTableNames(),
                             tableName -> Optional.ofNullable(
                                     buildTableForInit(tableName,

fe/fe-core/src/main/java/org/apache/doris/datasource/hive/HiveMetaStoreCache.java

@@ -177,7 +177,7 @@ public void setNewFileCache() {
 
         CacheFactory fileCacheFactory = new CacheFactory(
                 OptionalLong.of(fileMetaCacheTtlSecond >= HMSExternalCatalog.FILE_META_CACHE_TTL_DISABLE_CACHE
-                        ? fileMetaCacheTtlSecond : 86400L),
+                        ? fileMetaCacheTtlSecond : 28800L),
                 OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60L),
                 Config.max_external_file_cache_num,
                 false,

fe/fe-core/src/main/java/org/apache/doris/datasource/hudi/source/HudiCachedPartitionProcessor.java

@@ -52,9 +52,9 @@ public HudiCachedPartitionProcessor(long catalogId, ExecutorService executor) {
         this.catalogId = catalogId;
         this.executor = executor;
         CacheFactory partitionCacheFactory = new CacheFactory(
-                OptionalLong.of(86400L),
+                OptionalLong.of(28800L),
                 OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60),
-                Config.max_hive_table_cache_num,
+                Config.max_external_table_cache_num,
                 false,
                 null);
         this.partitionCache = partitionCacheFactory.buildCache(key -> new TablePartitionValues(), null, executor);

fe/fe-core/src/main/java/org/apache/doris/datasource/iceberg/IcebergMetadataCache.java

@@ -55,17 +55,17 @@ public class IcebergMetadataCache {
 
     public IcebergMetadataCache(ExecutorService executor) {
         CacheFactory snapshotListCacheFactory = new CacheFactory(
-                OptionalLong.of(86400L),
+                OptionalLong.of(28800L),
                 OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60),
-                Config.max_hive_table_cache_num,
+                Config.max_external_table_cache_num,
                 false,
                 null);
         this.snapshotListCache = snapshotListCacheFactory.buildCache(key -> loadSnapshots(key), null, executor);
 
         CacheFactory tableCacheFactory = new CacheFactory(
-                OptionalLong.of(86400L),
+                OptionalLong.of(28800L),
                 OptionalLong.of(Config.external_cache_expire_time_minutes_after_access * 60),
-                Config.max_hive_table_cache_num,
+                Config.max_external_table_cache_num,
                 false,
                 null);
         this.tableCache = tableCacheFactory.buildCache(key -> loadTable(key), null, executor);

fe/fe-core/src/main/java/org/apache/doris/datasource/metacache/MetaCache.java

@@ -57,7 +57,7 @@ public MetaCache(String name,
         CacheFactory namesCacheFactory = new CacheFactory(
                 expireAfterWriteSec,
                 refreshAfterWriteSec,
-                maxSize,
+                1, // names cache has one and only one entry
                 true,
                 null);
         CacheFactory objCacheFactory = new CacheFactory(