kv: add a rate limiter to control the maximum op request frequency

[spencerkimball]

Specify --max-rate=<frequency> in order to activate a rate limiter.

Fixes #32

---

This change is 

[spencerkimball]

+cc @BramGruneir

[BramGruneir]

LGTM

[petermattis]

---

Review status: 0 of 1 files reviewed at latest revision, 2 unresolved discussions.

---

kv/main.go, line 190 at r1 (raw file):

	if *maxRate > 0 {
		// Create a limiter using maxRate specified on the command line and
		// with allowed burst of 10s at the maximum allowed rate.

Where is the allowed burst of 10s happening? Looks like the burst size is 1.

---

kv/main.go, line 191 at r1 (raw file):

		// Create a limiter using maxRate specified on the command line and
		// with allowed burst of 10s at the maximum allowed rate.
		b.limiter = rate.NewLimiter(rate.Limit(*maxRate), 1)

Don't you want to share a rate limiter amongst all of the blockers?

---

Comments from Reviewable

[spencerkimball]

Review status: 0 of 1 files reviewed at latest revision, 2 unresolved discussions.

---

kv/main.go, line 190 at r1 (raw file):

Previously, petermattis (Peter Mattis) wrote…

Where is the allowed burst of 10s happening? Looks like the burst size is 1.

Done.

---

kv/main.go, line 191 at r1 (raw file):

Previously, petermattis (Peter Mattis) wrote…

Don't you want to share a rate limiter amongst all of the blockers?

Done.

---

Comments from Reviewable