Small file upload to s3 hangs with 100% CPU usage using Paperclip

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If you're experiencing a hang with 100% CPU usage when uploading a small file to Amazon S3 using Paperclip, there are a few possible causes.

Network Latency: 

The issue could be caused by network latency between your server and S3. This can cause the upload to take longer than expected and result in high CPU usage. You can try running a network diagnostic tool to check for any network issues.

IAM Credentials: 

The issue could also be related to IAM credentials. Ensure that your IAM credentials are correct and that you have sufficient permissions to upload to S3. You can check this by running the Paperclip upload command manually using the AWS CLI.

S3 Bucket Location:

 The issue could also be related to the location of your S3 bucket. Ensure that your S3 bucket is in the same region as your server to reduce latency.

Paperclip Configuration: 

The issue could also be related to your Paperclip configuration. Check that you have configured Paperclip correctly and that you have set the correct S3 credentials, region, and bucket name.

File Size Limitations: 

If you are uploading a file that is larger than the maximum allowed by Paperclip, it could cause high CPU usage and a hang. Check the Paperclip configuration to ensure that the maximum file size is set correctly.

To debug the issue, you can try the following:

Check the logs: Check the logs to see if there are any error messages or warnings related to the upload process.

Check the CPU usage: Check the CPU usage on your server using a system monitoring tool to see if there is a spike in usage during the upload process.

Try uploading a different file: Try uploading a different file to see if the issue is related to the specific file you are trying to upload.

Use a different tool: Try using a different tool to upload the file to see if the issue is related to Paperclip specifically. For example, you can try using the AWS CLI to upload the file.