Roll back an activity on failure

rey · April 27, 2023, 11:52pm

Taking the example of money transfer in a banking app described in the docs, I have a question regarding a scenario.

Money transfer has 2 steps: withdrawal and deposit. Let’s say withdrawal was a success. Now while trying to deposit, it fails because the routing number is incorrect. Now I want the withdrawal to be rolled back. I’m trying to make a case where if an activity fails, the previous activities should be rolled back.

How does Temporal handle this?

tihomir · April 28, 2023, 12:00am

Which sdk are you using. If activity B fails you can run activity that compensates already performed A. Java sdk has a built in saga class id that helps:

github.com

temporalio/samples-java/blob/main/src/main/java/io/temporal/samples/hello/HelloSaga.java

/*
 *  Copyright (c) 2020 Temporal Technologies, Inc. All Rights Reserved
 *
 *  Copyright 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 *  Modifications copyright (C) 2017 Uber Technologies, Inc.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"). You may not
 *  use this file except in compliance with the License. A copy of the License is
 *  located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 *  or in the "license" file accompanying this file. This file is distributed on
 *  an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 *  express or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 */

package io.temporal.samples.hello;

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rey · May 1, 2023, 10:10pm

Thank you for responding. I’m using go sdk, and I found an example implementing the saga pattern - samples-go/saga at main · temporalio/samples-go · GitHub.

wshv · October 24, 2023, 5:41pm

@tihomir Hi is there any similar util exist in python SDK? I cannot locate that. Also the saga sample is not present in GitHub - temporalio/samples-python: Samples for working with the Temporal Python SDK

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Roll back an activity on failure

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