Final Status: An unusually long processing delay occurred when an update was deployed to the Yammer caching infrastructure. Engineers detected the issue and monitored the Yammer service while the process completed. The issue was caused by the update process and is not expected to reoccur.
User Experience: Affected users may have been unable to load feeds, or feeds loaded slowly.
Customer Impact: Customer impact appears to be limited at this time.
Incident Start Time: Thursday, May 7, 2015, at 11:11 PM UTC
Incident End Time: Thursday, May 7, 2015, at 11:20 PM UTC
Preliminary Root Cause: As part of our efforts to improve cross-datacenter reliability, an update was deployed to the caching infrastructure; however, the update resulted in a high number of difficult-to-compute entries, causing a longer processing delay than expected.
The following is a list of known action item(s) associated with this incident. As part of the Office 365 problem management process, additional engineering actions may be identified to improve the overall service.
– Action: Review the infrastructure update process as the update process caused impact to the Yammer service.
Please consider this service notification the final update on the event.