transactions

问题 I need to execute a multiple MySql Queries and Multiple MongoDB queries. If the execution of one of the queries fails (SQL or Mongo) I must rollback all the executed queries. Is that possible? 回答1: You might want to check out Spring Transactions. This is one of the solutions I am aware of. Another solution might be to do it manually: store the current documents/rows try to update them and roll back if necessary. It might help to take a step back and ask yourself whether it really makes sense

问题 I need to execute a multiple MySql Queries and Multiple MongoDB queries. If the execution of one of the queries fails (SQL or Mongo) I must rollback all the executed queries. Is that possible? 回答1: You might want to check out Spring Transactions. This is one of the solutions I am aware of. Another solution might be to do it manually: store the current documents/rows try to update them and roll back if necessary. It might help to take a step back and ask yourself whether it really makes sense

问题 Begin transaction Tx1 Tx1 performs a SELECT Commit Tx1 Begin transaction Tx2 in a different session, using a different connection Tx2 performs a SELECT Update rows in Tx2 Commit Tx2 Begin a new transaction, Tx1 Perform select - get results from step 2(??) Commit Tx1 Begin transaction Tx1 Perform select - get CORRECT results, i.e. the committed updates from Tx2 Very confused... How can this happen? It is happening reliably and consistently. 回答1: Turns out this can happen if the transaction

问题 Begin transaction Tx1 Tx1 performs a SELECT Commit Tx1 Begin transaction Tx2 in a different session, using a different connection Tx2 performs a SELECT Update rows in Tx2 Commit Tx2 Begin a new transaction, Tx1 Perform select - get results from step 2(??) Commit Tx1 Begin transaction Tx1 Perform select - get CORRECT results, i.e. the committed updates from Tx2 Very confused... How can this happen? It is happening reliably and consistently. 回答1: Turns out this can happen if the transaction

问题 We have a spring boot application which consumes messages from IBM MQ does some transformation and publishes the result to a Kafka topic. We use https://spring.io/projects/spring-kafka for this. I am aware that Kafka does not supports XA; however, in the documentation I found some inputs about using a ChainedKafkaTransactionManager to chain multiple transaction managers and synchronise the transactions. The same documentation also provides an example about how to synchronise Kafka and

问题 I'm working on a distributed system that uses distributed transactions, which means that I may have a transaction that needs to edit multiple databases (on multiple servers) at the same time. In my system there is a controller to manage the distribution. the scenario that I want to satisfy is: server A wants to initiate a distributed transaction. the participants are server A and server B. so server A sends a request to the controller to initiate a distributed transaction. the controller

问题 I'm working on a distributed system that uses distributed transactions, which means that I may have a transaction that needs to edit multiple databases (on multiple servers) at the same time. In my system there is a controller to manage the distribution. the scenario that I want to satisfy is: server A wants to initiate a distributed transaction. the participants are server A and server B. so server A sends a request to the controller to initiate a distributed transaction. the controller

问题 I am following this template for Spring-cloud-stream-kafka but got stuck while making the producer method transactional . I have not used kafka earlier so need help with this in case any configuration changes needed in kafka It works well if no transactional configuration added but when transactional configurations are added it gets timed out at startup - 2020-11-21 15:07:55.349 ERROR 20432 --- [ main] o.s.c.s.b.k.p.KafkaTopicProvisioner : Failed to obtain partition information org.apache

问题 If the student sends a message to the teacher, the message is saved in the teachers and students collections. The same situation is when a teacher sends a message to the student, they are also save in the two collections teachers and students . How can I apply mongoose transaction in the following code so that the message is saved in two collections.I don' want a situation that the message will be saved in one collection and in the other collection will not be saved due to an error. I am

问题 I have the following application setup: @SpringBootApplication @EnableTransactionManagement public class MyApp extends SpringBootServletInitializer { ... } with a class which has the following: public class DoStaff { public void doStaffOnAll(List<MyObject> myObjects) { for (int i=0; i<myObjects.size(); i++) { try { doStaffOnSingle(myObjects.get(i), i); } catch (Exception e) { e.printStrackTrace(); } } } @Transactional public void doStaffOnSingle(MyObject myObject, int i) { repository.save