我有一个Java Servlet,我想与jdbc(Database:mysql)一起使用连接池。
所以这就是我正在做的事情:
(此类是公共最终类DBConnector)
private static final HikariDataSource dataSource = new HikariDataSource();
private static final HikariDataSource dataSource2 = new HikariDataSource();
private static final HikariDataSource dataSource3 = new HikariDataSource();
static {
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/contentdb");
dataSource.setUsername("root2");
dataSource.setPassword("password");
dataSource.setMaximumPoolSize(400);
dataSource.setMinimumIdle(5);
dataSource.setLeakDetectionThreshold(15000);
dataSource.setConnectionTestQuery("SELECT 1");
dataSource.setConnectionTimeout(1000);
dataSource2.setDriverClassName("com.mysql.jdbc.Driver");
dataSource2.setJdbcUrl("jdbc:mysql://localhost:3306/userdb");
dataSource2.setUsername("root");
dataSource2.setPassword("password");
dataSource2.setMaximumPoolSize(300);
dataSource2.setMinimumIdle(5);
dataSource2.setLeakDetectionThreshold(15000);
dataSource2.setConnectionTestQuery("SELECT 1");
dataSource2.setConnectionTimeout(1000);
dataSource3.setDriverClassName("com.mysql.jdbc.Driver");
dataSource3.setJdbcUrl("jdbc:mysql://localhost:3306/analysedb");
dataSource3.setUsername("root2");
dataSource3.setPassword("password");
dataSource3.setMaximumPoolSize(200);
dataSource3.setMinimumIdle(5);
dataSource3.setLeakDetectionThreshold(15000);
dataSource3.setConnectionTestQuery("SELECT 1");
dataSource3.setConnectionTimeout(1000);
}
private DBConnector() {
//
}
public static Connection getConnection(int dataBase) throws SQLException {
if (dataBase == 0) {
return dataSource.getConnection();
} else if (dataBase == 1) {
return dataSource2.getConnection();
} else {
return dataSource3.getConnection();
}
}
当我想打电话时:
Connection con = null;
PreparedStatement query = null;
ResultSet result = null;
try {
con = DBConnector.getConnection(0);
}catch(SQLException ex){
}finally{
if (result != null) {
try {
result.close();
} catch (SQLException logOrIgnore) {
}
}
if (query != null) {
try {
query.close();
} catch (SQLException logOrIgnore) {
}
}
if (con != null) {
try {
con.close();
} catch (SQLException logOrIgnore) {
}
}
}
但是,当我点击我的应用程序时,一段时间后它开始挂起,我得到这些错误:
java.sql.SQLException: Timeout after 1001ms of waiting for a connection.
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:208)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:108)
at main.java.db.DBConnector.getConnection(DBConnector.java:60)
at main.java.ressources.SingleItemData.getVotes(SingleItemData.java:1088)
at main.java.item.methods.GET.content.GetStreamContent.getStreamContent(GetStreamContent.java:126)
at main.java.RestService.doGet(RestService.java:254)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
引起:com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:通信链接失败
我将mysql max_conncetions设置为1000." SHOW PROCESSLIST"查询向我展示了很多睡眠过程。这些是空闲的吗?
我真的被困在这里了。不知道哪个设置导致了这个问题。所以我的问题是 - 导致此错误的原因是什么?我究竟做错了什么?任何帮助赞赏。
编辑: 设置Mysql(localhost):
[mysqld]
user=mysql
port=3306
socket =/Applications/XAMPP/xamppfiles/var/mysql/mysql.sock
key_buffer=16M
max_allowed_packet=1M
table_open_cache=64
sort_buffer_size=512K
net_buffer_length=8K
read_buffer_size=256K
read_rnd_buffer_size=512K
myisam_sort_buffer_size=8M
max_connections = 1000
wait_timeout = 28800
interactive_timeout = 28800
HikariCP:HikariCP-java6-2.2.5.jar
MySQL Connector:mysql-connector-java-5.1.25-bin.jar
答案 0 :(得分:20)
一些事情。首先,什么版本的HikariCP,Java和MySQL驱动程序?
第二,一个池中有400个连接? Way too many!从每个池中的10到20开始。你会惊讶于你每秒可以处理几千笔交易。
第三,这是第二个问题in the FAQ。阅读答案和链接。您需要将maxLifetime
设置为比MySQL本机超时更短的时间(1分钟)。
最后,打开DEBUG日志记录,HikariCP没有嘈杂。每隔30秒,管家线程就会运行并记录池统计信息。