WooCommerce experienced a short outage after sending a newsletter to 800,000 recipients. The spike in traffic, caused by email security scanners fetching links simultaneously, led to temporary accessibility issues.
Key Takeaways
- A newsletter sent to 800,000 caused a brief site outage.
- Email security scanners triggered a significant traffic spike.
- Future campaigns will be staggered to prevent similar issues.
What Happened?
On July 31, WooCommerce sent a newsletter to a large audience, which resulted in the site going down for about three to four minutes. The traffic surged from around half a million requests to over a million almost instantly, overwhelming the servers.
Causes of the Outage
The spike was primarily due to email security scanners from corporate mailboxes, which fetch links in emails as soon as they are delivered. This resulted in a sudden influx of requests that the autoscaling infrastructure couldn’t handle immediately.
Changes in Sending Strategy
To avoid future outages, WooCommerce plans to stagger their email sends instead of delivering all at once. This approach was successfully tested during a subsequent campaign, preventing similar issues.
Takeaways
This incident serves as a reminder that large email campaigns can act as load-testing tools, potentially overwhelming servers. Store owners should coordinate with their hosting providers before major email sends to mitigate risks.
Frequently Asked Questions
What caused the WooCommerce site outage?
The outage was caused by a spike in traffic from email security scanners after a newsletter send.
How long did the WooCommerce site stay down?
The downtime lasted around three to four minutes.
What changes will WooCommerce make to future email campaigns?
WooCommerce will stagger email sends to avoid overwhelming their servers.
What was the impact of the newsletter send?
The newsletter sent to 800,000 recipients caused a significant traffic spike, overwhelming the site.
How can store owners prevent similar issues in the future?
Store owners should coordinate with their hosting providers and consider staggering large email campaigns.