We would like to inform that our Tokyo-based Metadata database will undergo maintenance today November 29th between 1300 and 1400 JST (0400 to 0500 UTC). We are performing this upgrade due to some increased base usage, in order to avoid any significant potential data loss or job failure incidents later.
We expect the maintenance operation to cause approximately 3-5 minutes of downtime only for customers based in our Tokyo region (no US downtime).
All components reading/writing the Metadata database have a built-in fault tolerance mechanism that will allow them to retry the database access should it fail during the operation and for a while after; in particular, the execution of queries should continue as usual although the dispatching of new queries may experience a temporary slowdown during the maintenance window. After the maintenance operation, the database is expected to come back within less than 30 seconds.
Customers in APAC may see a 3-5 minute additional import delay with no expected data loss.