Druid 获取连接死循环

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if (breakAfterAcquireFailure) {
    break;
}
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if (physicalConnection == null) {
    continue;
}

原因

breakAfterAcquireFailur默认为false。

且配置文件或代码中未设置 breakAfterAcquireFailur 属性和maxWait属性，

且因为循环为for(;;)，从而导致死循环重试。

解决

在配置文件或代码中设置 breakAfterAcquireFailur 属性和maxWait属性即可。

完整源码

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public class CreateConnectionThread extends Thread {

        public CreateConnectionThread(String name){
            super(name);
            this.setDaemon(true);
        }

        public void run() {
            initedLatch.countDown();

            long lastDiscardCount = 0;
            int errorCount = 0;
            for (;;) {
                // addLast
                try {
                    lock.lockInterruptibly();
                } catch (InterruptedException e2) {
                    break;
                }

                long discardCount = DruidDataSource.this.discardCount;
                boolean discardChanged = discardCount - lastDiscardCount > 0;
                lastDiscardCount = discardCount;

                try {
                    boolean emptyWait = true;

                    if (createError != null
                            && poolingCount == 0
                            && !discardChanged) {
                        emptyWait = false;
                    }

                    if (emptyWait
                            && asyncInit && createCount < initialSize) {
                        emptyWait = false;
                    }

                    if (emptyWait) {
                        // 必须存在线程等待，才创建连接
                        if (poolingCount >= notEmptyWaitThreadCount //
                                && (!(keepAlive && activeCount + poolingCount < minIdle))
                                && !isFailContinuous()
                        ) {
                            empty.await();
                        }

                        // 防止创建超过maxActive数量的连接
                        if (activeCount + poolingCount >= maxActive) {
                            empty.await();
                            continue;
                        }
                    }

                } catch (InterruptedException e) {
                    lastCreateError = e;
                    lastErrorTimeMillis = System.currentTimeMillis();

                    if (!closing) {
                        LOG.error("create connection Thread Interrupted, url: " + jdbcUrl, e);
                    }
                    break;
                } finally {
                    lock.unlock();
                }

                PhysicalConnectionInfo connection = null;

                try {
                    connection = createPhysicalConnection();
                } catch (SQLException e) {
                    LOG.error("create connection SQLException, url: " + jdbcUrl + ", errorCode " + e.getErrorCode()
                              + ", state " + e.getSQLState(), e);

                    errorCount++;
                    if (errorCount > connectionErrorRetryAttempts && timeBetweenConnectErrorMillis > 0) {
                        // fail over retry attempts
                        setFailContinuous(true);
                        if (failFast) {
                            lock.lock();
                            try {
                                notEmpty.signalAll();
                            } finally {
                                lock.unlock();
                            }
                        }

                        if (breakAfterAcquireFailure) {
                            break;
                        }

                        try {
                            Thread.sleep(timeBetweenConnectErrorMillis);
                        } catch (InterruptedException interruptEx) {
                            break;
                        }
                    }
                } catch (RuntimeException e) {
                    LOG.error("create connection RuntimeException", e);
                    setFailContinuous(true);
                    continue;
                } catch (Error e) {
                    LOG.error("create connection Error", e);
                    setFailContinuous(true);
                    break;
                }

                if (connection == null) {
                    continue;
                }

                boolean result = put(connection);
                if (!result) {
                    JdbcUtils.close(connection.getPhysicalConnection());
                    LOG.info("put physical connection to pool failed.");
                }

                errorCount = 0; // reset errorCount

                if (closing || closed) {
                    break;
                }
            }
        }
    }
Program > Java
#Druid
Druid 获取连接死循环
https://blog.josway.cc/2022/04/25/Program/Java/Druid 获取连接死循环/
作者
JOSWAY
发布于
2022年4月25日
许可协议