Physical machine

GCE n1-standard-2 machine type

• 1x dedicated local SSD mounted under /var/lib/etcd
• 1x dedicated slow disk for the OS
• 7.5 GB memory
• 2x CPUs

etcd

etcd Version: 2.2.0-rc.0+git
Git SHA: 103cb5c
Go Version: go1.5
Go OS/Arch: linux/amd64

Testing

Start 3-member etcd cluster, each of which uses 2 cores.

The length of key name is always 64 bytes, which is a reasonable length of average key bytes.

Memory Maximal Usage

• etcd may use maximal memory if one follower is dead and the leader keeps sending snapshots.
• max RSS is the maximal memory usage recorded in 3 runs.

Data Size Threshold

• When etcd reaches data size threshold, it may trigger leader election easily and drop part of proposals.
• At most cases, etcd cluster should work smoothly if it doesn’t hit the threshold. If it doesn’t work well due to insufficient resources, you need to decrease its data size.