【異常】ShardingSphere啟動很慢的問題 Too slow to load meta data when start up

一、出現的場景

依賴的sharding-jdbc-core的版本從 <version>4.0.0</version>升級到<version>4.1.1</version>，導致項目啟動特別慢

　　　　<dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-core</artifactId>
        </dependency>

二、解決辦法

設置max.connections.size.per.query參數

Properties properties = new Properties();
properties.setProperty("max.connections.size.per.query", "50");
return ShardingDataSourceFactory.createDataSource(createDataSourceMap(), configuration, properties);