We were able to work with Amazon Web Services to resolve the issue, and the Redshift clusters are available again. Data import has resumed and is up-to-date; there was no data loss.
Posted May 18, 2015 - 15:15 PDT
Identified
Amplitude Redshift clusters are temporarily unavailable. We've identified the issue and are working to resolve it. Data import into Redshift will be delayed until further notice.