Question

在多线程中，将Spring jdbctemplate与Spring 3.0结合使用时，

无法获得JDBC连接

或

没有可用的缓冲区空间错误

我创建了一个应用程序，在其中使用多线程对大约10万条记录进行操作。我已经使用spring jdbctemplate进行数据库操作。我正在创建50个线程来处理100k条记录，因此一个线程将不得不处理20k条记录。对于每个记录，将完成一些操作，并将其存储在多个表中。

for (int j = 0; j < nMaxThreads; j++) {
    Thread thTread = new Thread() {
    @Override
        public void run() {
            logger.error(this.getName() + " Started");
            try {
                -- Process and do database operations --
            } catch (Exception e) {
            logger.error("Exception occured while thread: " + this.getName(), e);
        }
        logger.error(this.getName() + " Finished");
    }
};
thTread.setName("JobCalcThread-" + j);
thTread.start();

处理完某些记录后，我随机遇到错误，并且所有线程都停止处理。

2019-04-10 19:50:17 ERROR TaxCalculateHelper:387 - Exception Occured: 
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Last packet sent to the server was 0 ms ago.
    at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:575)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:818)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:874)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:882)
    at com.pnp.dao.TaxCalcDao.saveUserCurrentTaxInfo(TaxCalcDao.java:670)
    at com.pnp.taxcalculator.TaxCalculateHelper.startTaxCalcProcessForUsers(TaxCalculateHelper.java:378)
    at com.pnp.taxcalculator.TaxCalculateHelper$1.run(TaxCalculateHelper.java:351)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

或

Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at java.net.Socket.<init>(Unknown Source)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2027)
    ... 23 more

注意：所有线程都在同一表上执行操作

带有Spring 3.0 JdbcTemplate和多线程的org.springframework.jdbc.CannotGetJdbcConnectionException

0 个答案: