spring 中mongoDB事务配置

配置事务

事务管理器配置代码：

@Configuration
public class TransactionConfig {
    @Bean
    MongoTransactionManager transactionManager(MongoDatabaseFactory factory) {
        return new MongoTransactionManager(factory);
    }
}

在对应方法加上事务注解。

事务中只能读主库，从库不能读。

错误：Read preference in a transaction must be primary。

mongoDB配置：

mongodb://xxxxx?readPreference=secondaryPreferred&authMechanism=SCRAM-SHA-256&maxPoolSize=20&minPoolSize=5&connectTimeoutMS=10000&socketTimeoutMS=10000&serverSelectionTimeoutMS=5000

去掉配置：readPreference=secondaryPreferred

不能创建索引：

Command failed with error 263 (OperationNotSupportedInTransaction): 'Cannot run 'createIndexes' in a multi-document transaction。

由于代码中的PO代码加了创建索引的注解：

@Data
@Document(collection = "xxx")
@CompoundIndex(name = "xx", def = "{'xx' : 1}")
public class xxxPO {

}

类似错误：

(OperationNotSupportedInTransaction) Cannot create namespace test.application in multi-document transaction 错误的解决方法 - 水郁 - 博客园

How to prevent Spring from trying to create indexes during MongoDB transactions? - Stack Overflow

去掉创建索引的注解。

参考：https://blog.csdn.net/weixin_43931625/article/details/102236889