我正在编写代码来使用cloudera提供的JDBC驱动程序访问impala . 而且效果很好 .
但是，我面临一个小问题，...
关闭连接后，当我使用netstat -an |检查连接时grep -i 21050，我得到的连接仍处于Established状态，直到程序退出，程序退出时清除所有Established连接 .
Connection con = DriverManager.getConnection（“jdbc：impala：//10.184.43.100：21050”）; con.close（）; ///连接应该在这里关闭 . 但它不在这里关闭Thread.sleep（20000）; ///连接正在关闭
Why connections to impalad are still alive even after calling the connection.close(). ???? Am i doing something wrong???
要模拟这个，请检查以下代码，之后的位置
public class ClouderaJDBCImpalaExample {
// Define a string as the fully qualified class name (FQCN) of
// the desired JDBC driver
static String JDBCDriver = "com.cloudera.impala.jdbc41.Driver";
// Define a string as the connection URL
static String ConnectionURL = "jdbc:impala://10.184.43.100:21050";
static{
try {
// Register the driver using the class name
Class.forName(JDBCDriver);
LogController.logInfoMessage("Impala Driver Loaded.");
}catch(Exception ex)
{
ex.printStackTrace();
System.exit(0);
}
}
public static void main(String[] args) throws InterruptedException {
Connection con = DriverManager.getConnection("jdbc:impala://10.184.43.100:21050");
con.close();
///The connection should close here. But its not closing here
Thread.sleep(20000);
///Connection is closing here.
}
root @ pasapp~＃netstat -an | grep -i 21050
tcp 0 0 0.0.0.0:21050 0.0.0.0:* LISTEN
tcp 0 0 10.184.43.100:21050 169.144.48.135:52137已 Build
root @ pasapp~＃
谢谢 ！！！
1 回答
此驱动程序执行连接池 . 你的关闭！=游泳池的关闭 . 毫无疑问，有一些方法可以配置池 .