Issue summary:
Starting on October 5, 2020 at 5:58 a.m. PDT, some customers experienced degraded functionality in Slack due to slow API performance. Apple remote driver windows. Since many of Slack's features rely on making API calls, customers experienced latency in almost all aspects of our service. This included, but wasn't limited to, the sending and loading of messages in threads and channels, as well as searching, calling, and accessing administrative features.
We initially identified an overloaded database memory cache server as a source of instability. At 8:10 a.m. PDT, we provisioned a replacement server for this host. When it came online, it unexpectedly caused additional instability and further degraded the performance and availability of our API. The replacement server came fully online with no residual instability in our database memory cache layer by 8:52 a.m. PDT.
While we were working on the previous memory cache issue, our team also began looking into problems with our internal service discovery system. This system is responsible for routing traffic within our infrastructure to the multiple services that support various features of Slack. Macbook word document. We made several changes to this system over the course of the next several hours to remediate the impact of its instability. Throughout this time, our service was degraded, but was still available.
At 1:25 p.m. PDT, one of these configuration changes inadvertently degraded Slack's availability further and triggered an outage. We immediately identified and deployed a fix for this issue, which finished rolling out to our server fleet at 1:38 p.m. PDT. At this point, we determined the system was fully recovered and operating normally for all customers.
Around 5:00 p.m. PDT, we received reports about portions of the product that were still impacted by ripple effects from the earlier disruption in our service discovery system. This included search, which we remedied at 5:40 p.m. PDT. We also saw lingering errors in applications using our Real Time Messaging (RTM) API, and resolved those problems by 10:30 p.m. PDT with similar remediation steps.
Our teams have been working around the clock on ensuring that Slack remains available, fast, and reliable. Split movie duration. While we haven't yet resolved all the underlying nuances of the degradation in our service discovery system, we're confident that we have a path forward and that we have proper mitigations in place to continue this work. We don't expect any additional customer impact due to this issue. However, if similar problems do arise, we'll provide updates on this site. If you would like to receive a full Root Cause Analysis (RCA) report, please reach out to feedback@slack.com to request one. Understanding and remediating this issue has our full attention — nothing is a higher priority — and we'll send the report to you once it's ready.
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Tracking website Down Detector showed a spike in reports of problems with the messaging app. Some parts of Slack's website also appeared to be inaccessible. But the company's official Twitter.
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Starting around 6:00 a.m. PST on January 4, 2021, some customers started experiencing occasional errors and increased latency while using Slack. Around 7:00 a.m. PST there was a rapid increase in errors and Slack wasn't usable for all customers.
Around 8:13 a.m. PST, we addressed an issue with our provisioning service and began provisioning healthy servers once again to address traffic requests. From there, at 8:45 a.m. PST, some customers began to see improvements, but others who were trying to launch their Slack clients were unable to do so. By around 9:15 a.m. PST most customers were able to use Slack again. We continued to experience elevated errors until 10:40 a.m. PST, after which all customers were able to use Slack again.
We also discovered some customers were stuck on a webpage in the Slack desktop app. This is a separate bug that's being investigated, but was heightened during the outage. Troubleshooting steps, such as restarting, forcing quitting Slack from Activity Monitor or Task Manager, or clearing cache, allowed affected customers to access the app once again.
We know our customers rely on Slack. Our top priorities are working alongside our cloud vendors to fully understand the underlying causes of the outage and putting safeguards in place to prevent similar problems from happening again. If you'd like to receive a full Root Cause Analysis (RCA) report, please reach out to feedback@slack.com to request one.
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Slack Official Website Templates
- The Slack Web API is an interface for querying information from and enacting change in a Slack workspace. Use it on the fly for ad-hoc queries, or as part of a more complex tapestry of platform features in a Slack app.
- Stack Overflow is the largest, most trusted online community for developers to learn, share their programming knowledge, and build their careers.
- Slack APIs allow you to integrate complex services with Slack to go beyond the integrations we provide out of the box.
