How to ensure the atomicity of transactions when using the Cosmos Java SDK for development？

Question

When using the Cosmos DB Java SDK for development, how to ensure the atomicity of transactions when modifying data operations in a method？Thanks

Answer 1

When using the Cosmos DB Java SDK for development, you can ensure the atomicity of transactions by following these steps:

Enable the multi-master feature: Atomic transactions are supported in Cosmos DB only when the multi-master feature is enabled. Ensure that multi-master is enabled for your Cosmos DB account.

Use the CosmosClient.createTransactionalBatch() method: To perform atomic operations within a transaction, you need to use the createTransactionalBatch() method of the CosmosClient class. This method allows you to create a batch of operations that will be executed atomically.

Add operations to the transactional batch: Use the various methods available in the TransactionalBatch class to add the operations you want to perform within the transaction. These operations can include creating documents, updating documents, deleting documents, and executing stored procedures.

Execute the transactional batch: Once you have added all the desired operations to the transactional batch, you can execute the batch by calling the TransactionalBatch.execute() method. This will send the batch request to Cosmos DB to be executed atomically.

Handle the response: After executing the transactional batch, you can handle the response to determine the outcome of the transaction. The response will indicate whether the batch was executed successfully or if any errors occurred during the transaction.

It's important to note that transactions in Cosmos DB have some limitations and considerations. For example, transactions have a maximum execution time, and the number of operations within a transaction is also limited. It's recommended to review the Cosmos DB documentation and guidelines for using transactions to ensure that your application meets the requirements and limitations of the Cosmos DB transactional model.

By following these steps and considering the limitations, you can ensure the atomicity of transactions when using the Cosmos DB Java SDK for development.