Скачать или смотреть Solving the React Native Build Hang on CircleCI with Memory Management Tricks

If your `React Native` builds are hanging on `CircleCI`, particularly during bundling, discover effective solutions to resolve memory issues and optimize your CI process.
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Solving the React Native Build Hang on CircleCI with Memory Management Tricks

In the fast-paced world of mobile app development, Continuous Integration (CI) platforms like CircleCI are essential for automating testing and deployment. However, developers may occasionally encounter unexpected issues during the build process. One such issue arises when a React Native bundle hangs on CircleCI but works fine when run via SSH. This problem typically leads to frustrating timeouts and can significantly delay development timelines.

The Problem: Hanging Builds

Developers using CircleCI for building Android SDKs with Fastlane have reported instances where the build process freezes, ultimately resulting in the Too long with no output (exceeded 10m0s): context deadline exceeded error message. This is particularly concerning as it halts progress without providing any clear indication of what's gone wrong. The freezing typically occurs during the yarn bundling step, essential for preparing the application for Android.

Excerpt from relevant configuration highlights the issue:

[[See Video to Reveal this Text or Code Snippet]]

Despite attempts to extend the timeout limit or rerun with SSH access, the problem persists. This leaves developers in a frustrating loop of trial and error without a clear path to resolution.

Symptoms of the Issue

Freezing during the yarn bundle-android step

Timeout errors due to lack of output

Varying error messages when attempting to change configurations via SSH

The Solution: Addressing Memory Limitations

Fortunately, the root of this issue has been identified as a memory limitation within the CircleCI environment. Here's how to overcome it effectively:

Step 1: Increasing Resource Allocation

By adding the directive resource_class: large to your CircleCI configuration, you allocate more memory to the job, potentially resolving the issues that arise from insufficient resources. This can look something like this in your config.yaml file:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Running the Build Again

Once you've made the above changes, re-run the CircleCI job. This allows the build process to utilize the increased memory allocation effectively, leading to a smoother experience and the successful traversal of the previously freezing step.

Step 3: Monitoring Performance

In case the issues persist even after increasing resources, it’s crucial to monitor your build's performance to identify other potential bottlenecks. Some best practices include:

Optimize Dependencies: Review your package.json and Gemfile.lock files to ensure you're not pulling in unnecessary dependencies or large packages.

Profile Memory Usage: Utilize profiling tools to better understand your memory usage during builds.

Local Testing: Continue to run the build locally using the same Docker image to confirm that the issue is specific to the CI environment.

Conclusion

The freezing of the React Native build process on CircleCI can be a significant roadblock but is manageable with the right interventions. By increasing the memory allocation within your CI configuration and keeping an eye on your project's resource demands, you can ensure smoother builds moving forward. Optimization and continuous monitoring will make your CI experience far more pleasant, ultimately accelerating your development cycle and pushing projects forward seamlessly.

Remember, a little tweak can make a big difference!