It is an internal cache implementation. The library writer _thought_ this codepath would never be triggered - or at least very rarely, but that was proven wrong on the new hardware.
In my uninformed opinion:
1. waiting for 1 second sounds like a hack
2. The application should be doing cache writes asynchronously as as not to affect overall server latencies
In my uninformed opinion: 1. waiting for 1 second sounds like a hack 2. The application should be doing cache writes asynchronously as as not to affect overall server latencies