连接太多，AWS EC2 上的 tomcat7

Question

我注册了一个新的 AWS 免费帐户，我正在尝试通过 JNDI 池连接将 Tomcat 连接到 RDS 数据库。 Beanstalk上部署的war是默认的（没有任何数据库连接和查询）

这是我的 context.xml 的样子

<Context>

<WatchedResource>WEB-INF/web.xml</WatchedResource>

<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<Manager pathname="" />

<!-- Uncomment this to enable Comet connection tacking (provides events
     on session expiration as well as webapp lifecycle) -->
<!--
<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
-->
<Resource name="jdbc/web"
      auth="Container"
      type="javax.sql.DataSource"
      factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
      testWhileIdle="true"
      testOnBorrow="true"
      testOnReturn="false"
      validationQuery="SELECT 1"
      timeBetweenEvictionRunsMillis="30000"
      maxActive="10"
      maxIdle="5"
      minIdle="1"
      removeAbandonedTimeout="60"
      removeAbandoned="false"
      logAbandoned="true"
      minEvictableIdleTimeMillis="30000"
      closeMethod="close"
      jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
      username="root"
      password="password"
      driverClassName="com.mysql.jdbc.Driver"
      url="jdbc:mysql://aamhszwo5p1rrw.cf7vbk9ataaz.us-west-2.rds.amazonaws.com:3306/broadleaf"/>
<Resource name="jdbc/storage"
          auth="Container"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          testWhileIdle="true"
          testOnBorrow="true"
          testOnReturn="false"
          validationQuery="SELECT 1"
          timeBetweenEvictionRunsMillis="30000"
          maxActive="10"
          maxIdle="5"
          minIdle="1"
          removeAbandonedTimeout="60"
          removeAbandoned="false"
          logAbandoned="true"
          minEvictableIdleTimeMillis="30000"
          closeMethod="close"
          jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
          username="root"
          password="password"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://aamhszwo5p1rrw.cf7vbk9ataaz.us-west-2.rds.amazonaws.com:3306/broadleaf"/>
<Resource name="jdbc/secure"
          auth="Container"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          testWhileIdle="true"
          testOnBorrow="true"
          testOnReturn="false"
          validationQuery="SELECT 1"
          timeBetweenEvictionRunsMillis="30000"
          closeMethod="close"
          maxActive="10"
          maxIdle="5"
          minIdle="1"
          removeAbandonedTimeout="60"
          removeAbandoned="false"
          logAbandoned="true"
          minEvictableIdleTimeMillis="30000"
          jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
          username="root"
          password="password"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://aamhszwo5p1rrw.cf7vbk9ataaz.us-west-2.rds.amazonaws.com:3306/broadleaf"/>
<Resource name="jdbc/event"
          auth="Container"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          testWhileIdle="true"
          testOnBorrow="true"
          testOnReturn="false"
          validationQuery="SELECT 1"
          timeBetweenEvictionRunsMillis="30000"
          closeMethod="close"
          maxActive="10"
          maxIdle="5"
          minIdle="1"
          removeAbandonedTimeout="60"
          removeAbandoned="false"
          logAbandoned="true"
          minEvictableIdleTimeMillis="30000"
          jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
          username="root"
          password="password"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://aamhszwo5p1rrw.cf7vbk9ataaz.us-west-2.rds.amazonaws.com:3306/broadleaf"/>

</Context>

当我重新启动 tomcat 时，我收到以下异常。

SEVERE: Unable to create initial connections of pool.
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.Util.getInstance(Util.java:381)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3923)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1273)

我不确定在没有让我的 webapp 触发任何查询甚至连接到数据库的情况下连接是如何达到极限的

Answer 1

您的 AWS 数据库存在允许的连接配额问题。通过设置 4 个数据源，每 10 个连接到该数据库，您就超过了该限制。

通过将 maxActive 降低到更低的值（比如... 3？）你应该可以开始了（现在）

至于性能方面的考虑：只要您的 none 池变得过于活跃，这就可以正常工作。

从长远来看，我会推荐其中的一个或多个：

在 AWS 中的数据库上获得更大的连接配额
获得更多具有不同权限的用户以反映您想要的用途
减少池的数量 - 如果它们在同一个数据库上做类似的事情，您最好使用一个分配了所有配额的池。因此，您可以在当时最需要的地方分配连接。

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