How to avoid deadlocks and ring transactions in distributed transaction processing

In order to avoid deadlocks and ring transactions in distributed transactions, the following strategies can be adopted: avoid holding multiple resources at the same time and only hold one of them at a time; use deadlock detection and recovery mechanisms; use distributed transaction management Server to coordinate transactions on different resources.

How to avoid deadlocks and rings in distributed transaction processing

In distributed transactions, deadlocks and rings Transactions can cause serious system failures. These problems are often caused by multiple transactions requesting the same resource at the same time.

In order to prevent these problems, the following strategies can be adopted:

Avoid holding multiple resources at the same time

If a transaction needs to access multiple resources, It should only hold one of these resources at a time. It should not request other resources before releasing this resource.

Use deadlock detection and recovery mechanisms

Some database management systems (DBMS) provide deadlock detection and recovery mechanisms. These mechanisms can detect deadlocks and automatically roll back the transactions involved.

Using the Distributed Transaction Manager

A Distributed Transaction Manager (DTM) is a software component that coordinates transactions on different resources. DTM can help avoid deadlocks and ring transactions as it ensures transactions are executed in an atomic and consistent manner.

Practical Case: Ordering System

Consider an ordering system where users can create orders and add items to the order. The system uses a distributed database to store order and item data.

If User A and User B try to add the same item to their order at the same time, a deadlock may occur. To prevent this, we can use the following strategy:

1. User A requests a lock on the commodity resource.
2. User B requests the lock of product resources.
3. Because the product resources have been locked, user B's request was rejected.
4. User A adds products to the order and releases the lock on the product resources.
5. User B can now request the lock of the product resource and add the product to the order.

By following these strategies, we can avoid deadlocks and ring transactions in distributed transaction processing, thereby improving the availability and reliability of the system.

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