mvcc: Optimize compaction for short commit pauses
mvcc: Optimize compaction for short commit pauses

etcd-io/etcd,mqliang/etcd,rnaveiras/etcd,mqliang/etcd,ajityagaty/etcd,rnaveiras/etcd,gyuho/etcd,mkumatag/etcd,cockroachdb/etcd,coreos/etcd,li-ang/etcd,mkumatag/etcd,dannysauer/etcd,etcd-io/etcd,mkumatag/etcd,gyuho/etcd,etcd-io/etcd,mqliang/etcd,dannysauer/etcd,rnaveiras/etcd,coreos/etcd,li-ang/etcd,ajityagaty/etcd,cockroachdb/etcd,ajityagaty/etcd