hack: benchmarking to use Content Type: application/x-www-form-urlencoded
boom sends PUT request with Content-Type: text/html, and this cannot be parsed by etcd. It should use Content-Type: application/x-www-form-urlencoded. Post this fix the official etcd benchmarks should be updated as the keysize was not a factor as the value being set was always empty.
Andrei Krasnitski