We are using Client 1.3.9 (also saw this issue with 1.3.8).
Load is heavy (frequency) but light (size of responses). We are hitting Couchbase approximately 50-100 times per second. The data we are pulling from Couchbase is fairly static and can be large, so the code preference is to verify the existing (locally cached) data’s CAS value before doing a pull of the full data element, which can vary greatly in size (2k - 600k).
We are NOT doing any sort of rebalance / failover / etc. https://www.couchbase.com/issues/browse/NCBC-655 describes similar behavior, but we are not in any Rebalance / health-related operations.