MySql 错误"Cannot create PoolableConnectionFactory (Could not create connection to database server.)"连

Question

我正在尝试将Azkaban(hadoop的作业调度程序(与我的本地mysql连接起来。azkaban的配置文件看起来像：

database.type=mysql
mysql.port=3306
mysql.host=localhost
mysql.database=azkaban
#Changed by Prakhar for azkaban , Azkaban
mysql.user=root
mysql.password= [ Password of mysql ]

我的MySql有一个名为"azkaban"的数据库，我可以使用以下命令登录MySql：

./mysql -u root -p

mysql也在3306端口上工作，我已经验证了这一点。我仍然无法连接到mysql。阿兹卡班的日志如下：

2020/04/11 22:38:05.584 +0530 ERROR [MySQLDataSource] [Azkaban] Failed to find write-enabled DB connection. Wait 15 seconds and retry. No.Attempt = 1
java.sql.SQLException: Cannot create PoolableConnectionFactory (Could not create connection to database server.)
at org.apache.commons.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2294)
at org.apache.commons.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2039)
at azkaban.db.MySQLDataSource.getConnection(MySQLDataSource.java:76)
at org.apache.commons.dbutils.AbstractQueryRunner.prepareConnection(AbstractQueryRunner.java:175)
at org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:286)
at azkaban.db.DatabaseOperator.query(DatabaseOperator.java:68)
at azkaban.executor.ExecutorDao.fetchActiveExecutors(ExecutorDao.java:53)
at azkaban.executor.JdbcExecutorLoader.fetchActiveExecutors(JdbcExecutorLoader.java:266)
at azkaban.executor.ExecutorManager.setupExecutors(ExecutorManager.java:223)
at azkaban.executor.ExecutorManager.<init>(ExecutorManager.java:131)
at azkaban.executor.ExecutorManager$$FastClassByGuice$$e1c1dfed.newInstance(<generated>)
at com.google.inject.internal.DefaultConstructionProxyFactory$FastClassProxy.newInstance(DefaultConstructionProxyFactory.java:89)
at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:111)
at 

Answer 1

可能有助于解决问题的几个指针。

1. 请检查安装的MySQL版本与用于构建Azkaban的Gradle文件中提到的MySQL客户端的版本
2. 最好使用MySQL 5.x版本
3. 确保安装兼容的客户端版本
4. 此外，在启动web执行器之前，请在数据库中创建Mysql表