即使在 connection.close() 调用后连接仍处于已建立状态
Connection is in established state even after connection.close() call
我正在编写代码以使用 cloudera 提供的 JDBC 驱动程序访问 impala。而且效果很好。
但是,我遇到了一个小问题,..
关闭连接后,当我使用 netstat -an | 检查连接时grep -i 21050 ,我得到的连接仍然处于 Established 状态,直到程序退出,当程序退出时,它会清除所有 Established 连接。
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.
为什么到 impalad 的连接在调用 connection.close() 之后仍然存在。 ???我做错了什么吗???
要模拟这个,请检查下面的代码,在
之后
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:* 听
tcp 0 0 10.184.43.100:21050 169.144.48.135:52137 已建立
root@pasapp ~ #
谢谢!!!
此驱动程序执行连接池。你的收盘价!= 池的收盘价。毫无疑问,有一些方法可以配置池。
我正在编写代码以使用 cloudera 提供的 JDBC 驱动程序访问 impala。而且效果很好。
但是,我遇到了一个小问题,..
关闭连接后,当我使用 netstat -an | 检查连接时grep -i 21050 ,我得到的连接仍然处于 Established 状态,直到程序退出,当程序退出时,它会清除所有 Established 连接。
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.
为什么到 impalad 的连接在调用 connection.close() 之后仍然存在。 ???我做错了什么吗???
要模拟这个,请检查下面的代码,在
之后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:* 听
tcp 0 0 10.184.43.100:21050 169.144.48.135:52137 已建立
root@pasapp ~ #
谢谢!!!
此驱动程序执行连接池。你的收盘价!= 池的收盘价。毫无疑问,有一些方法可以配置池。