junit - MariaDB 连接随机失败但稳定
问题描述
我在 Eclipse 的 Ubuntu 20 TLS 中运行我的 junit 测试。
设置:
- 带有 testcontainers.org 的 docker 容器中的 mariadb
- 嵌入式码头中的 Spring 5 应用程序(仅用于 junit 测试)
我想知道为什么我的嵌入式码头在连接到数据库时会出现故障:
Caused by: java.net.SocketTimeoutException: Read timed out
我分析了几天(和几夜:()......什么也没找到。
所以我写了一个测试工具来找出测试容器设置是否有问题,而且 - 不幸的是 - 它似乎是:
如果我尝试连接、调用语句、断开连接并重复此操作,容器中的 mariadb 似乎会在一段时间后拒绝连接。
package de.enno.testcontainers_mariadb;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import org.junit.Rule;
import org.junit.Test;
import org.testcontainers.containers.MariaDBContainer;
public class MariaDBTest {
@Rule
public MariaDBContainer mariaDB = new MariaDBContainer("mariadb:10.3.6").withUsername("test").withPassword("test");
@Test
public void test() throws SQLException {
Connection connection = DriverManager.getConnection(mariaDB.getJdbcUrl(), "test", "test");
Statement stmt = connection.createStatement();
stmt.executeUpdate("CREATE TABLE a (id int not null primary key, value varchar(20))");
stmt.close();
connection.close();
for (int i = 0; i < 10000000; i++) {
if (i % 1000 == 0) {
System.err.println("Connect " + i + "...");
}
connection = DriverManager.getConnection(mariaDB.getJdbcUrl(), "test", "test");
stmt = connection.createStatement();
stmt.execute("SELECT * FROM a");
stmt.close();
connection.close();
}
}
}
<?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<groupId>de.enno</groupId>
<artifactId>testcontainers-mariadb</artifactId>
<version>0.0.1-SNAPSHOT</version>
<modelVersion>4.0.0</modelVersion>
<name>testcontainers-mariadb app</name>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.11</source>
<target>1.11</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>2.7.1</version>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>mariadb</artifactId>
<version>1.15.0</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
...
Connect 0...
Connect 1000...
Connect 2000...
Connect 3000...
Connect 4000...
Connect 5000...
java.sql.SQLNonTransientConnectionException: Could not connect to address=(host=localhost)(port=33135)(type=master) : Read timed out
at org.mariadb.jdbc.internal.util.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
at org.mariadb.jdbc.internal.util.exceptions.ExceptionFactory.create(ExceptionFactory.java:192)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1392)
at org.mariadb.jdbc.internal.util.Utils.retrieveProxy(Utils.java:635)
at org.mariadb.jdbc.MariaDbConnection.newConnection(MariaDbConnection.java:150)
at org.mariadb.jdbc.Driver.connect(Driver.java:89)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
at de.enno.testcontainers_mariadb.MariaDBTest.test(MariaDBTest.java:30)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.testcontainers.containers.FailureDetectingExternalResource$1.evaluate(FailureDetectingExternalResource.java:30)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
Caused by: java.sql.SQLNonTransientConnectionException: Read timed out
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.handleIoException(AbstractQueryProtocol.java:2075)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.java:1529)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.getResult(AbstractQueryProtocol.java:1508)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.readPipelineAdditionalData(AbstractConnectProtocol.java:1031)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.postConnectionQueries(AbstractConnectProtocol.java:880)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.createConnection(AbstractConnectProtocol.java:595)
at org.mariadb.jdbc.internal.protocol.AbstractConnectProtocol.connectWithoutProxy(AbstractConnectProtocol.java:1387)
... 31 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.base/java.net.SocketInputStream.socketRead0(Native Method)
at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:115)
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
at java.base/java.io.FilterInputStream.read(FilterInputStream.java:133)
at org.mariadb.jdbc.internal.io.input.ReadAheadBufferedStream.fillBuffer(ReadAheadBufferedStream.java:131)
at org.mariadb.jdbc.internal.io.input.ReadAheadBufferedStream.read(ReadAheadBufferedStream.java:104)
at org.mariadb.jdbc.internal.io.input.StandardPacketInputStream.getPacketArray(StandardPacketInputStream.java:247)
at org.mariadb.jdbc.internal.io.input.StandardPacketInputStream.getPacket(StandardPacketInputStream.java:218)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.java:1527)
... 36 more
这似乎不是超时问题 - 在某些情况下,测试会运行几秒钟,有时会运行几个小时,但是:它总是发生
任何想法,如何解决这个问题?
谢谢你的建议!
[update]:出现错误后尝试连接mariadb时,再次建立连接。
解决方案
推荐阅读
- iis - 存在 ADFS 401 问题的 SSO
- python - 列表和数组的形状以及如何在输入和输出中使用它们
- python - 如何找到 n 维 numpy 数组的第 i 个最大元素的索引?
- r - 从期权链中找到最接近当前股票价格的行使价。
- java - 减去圆弧的内半径/部分以实现环形进度条
- ruby - 将数组的元素添加到数组数组中每个数组的特定索引
- apache-kafka - Kafka - 保留期参数
- swift - 如何在 iOS 应用中存储和更新 .p12 证书?
- git - 为什么每次打开新的终端窗口都必须重新输入这些命令才能让 Git 工作?
- python - 当 .replace 和 .strip 不起作用时如何从字符串中删除空格