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<p>About a year ago, we migrated an old rate limiter in order to serve more traffic and accommodate a more resilient platform architecture. We adopted a replicated Redis backend with client-side sharding. In the end, it worked out great, but we learned some lessons along the way.</p>
<h2 id="the-problem"><a class="heading-link" href="#the-problem">The Problem<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>We had an old rate limiter that was simple enough:</p>
<ul>
<li>For every request, determine a “key” for the current rate limit</li>
<li>In Memcached, increment the value of that key, setting it to 1 if there wasn’t any current value</li>
<li>Also, if there wasn’t already one, set a “reset at” value in Memcached, using a related key (eg, &#8220;<code>#{key}:reset_at</code>&#8220;)</li>
<li>When incrementing, if the “reset at” value is in the past, ignore the existing value and set a new “reset at”</li>
<li>At the beginning of each request, if the value for the key is above the limit, and “reset at” is in the future, then reject the request</li>
</ul>
<p>(There might have been more nuance to it, but that’s the main idea.)</p>
<p>However, this limiter had two problems:</p>
<ul>
<li>Our Memcached architecture was due to change. Since it was <em>mostly</em> used as a caching layer, we were going to switch from a single, shared Memcached to one Memcached per datacenter. Although that’d work fine for application caching, it would cause our rate limiter to behave very strangely if client requests were routed to different data centers.</li>
<li>Memcached “persistence” wasn’t working for us. The Memcached backend was shared by the rate limiter and other application caches which meant that, when it filled up, it would sometimes evict rate limiter data, even when it was still active. (As a result, clients would get “fresh” rate limit windows when they shouldn’t. Sometimes, only <em>one</em> key would be evicted – they’d keep the same “used” value, but get new, future, “reset at” values!)</li>
</ul>
<h2 id="the-proposed-solution"><a class="heading-link" href="#the-proposed-solution">The proposed solution<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>After some discussion, we decided on a new design for the rate limiter:</p>
<ul>
<li>Use Redis, since it has a more appropriate persistence system and simple sharding and replication setups</li>
<li>Shard inside the application: the app would pick, for each key, which Redis cluster to read and write from</li>
<li>To mitigate the CPU-bound nature of Redis, put a single primary (for writes) and several replicas (for reads) in each cluster</li>
<li>Instead of writing “reset at” in the database, use Redis expiration to make values disappear when they no longer apply</li>
<li>Implement the storage logic in Lua, to guarantee atomicity of operations (this was an improvement over the previous design)</li>
</ul>
<p>One option we <em>considered</em> but decided against was using our MySQL-backed KV store (<a href="https://github.com/github/github-ds#githubkv" rel="noopener" target="_blank">GitHub::KV</a>) for storage. We didn’t want to add traffic to already-busy MySQL primaries: usually, we use replicas for GET requests, but rate limit updates would require write access to a primary. By choosing a different storage backend, we could avoid the additional (and substantial) write traffic to MySQL.</p>
<p>Another advantage to using Redis is that it’s a well-traveled path. We could take inspiration from two excellent existing resources:</p>
<ul>
<li>Redis’s own documentation, which includes some <a href="https://redis.io/commands/incr#pattern-rate-limiter" rel="noopener" target="_blank">rate limiter patterns</a></li>
<li>Stripe’s technical blog post, “<a href="https://stripe.com/blog/rate-limiters" rel="noopener" target="_blank">Scaling your API with Rate Limiters</a>”, which includes a Ruby and Redis <a href="https://gist.github.com/ptarjan/e38f45f2dfe601419ca3af937fff574d" rel="noopener" target="_blank">example implementation</a></li>
</ul>
<h2 id="the-release"><a class="heading-link" href="#the-release">The release<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>To roll out this change, we isolated the current persistence logic into a <code>MemcachedBackend</code> class, and built a new <code>RedisBackend</code> class for the rate limiter. We used a feature flag to gate access to the new backend. This allowed us to gradually increase the percentage of clients using the new backend. We could change the percentage <em>without</em> a deploy, which meant, if something went wrong, we could quickly switch back to the old implementation.</p>
<p>The release went smoothly, and when it was done, we removed the feature flag and the <code>MemcachedBackend</code> class, and integrated <code>RedisBackend</code> directly with the <code>Throttler</code> class that delegated to it.</p>
<p>Then, the bug reports started flowing in….</p>
<h2 id="the-bugs"><a class="heading-link" href="#the-bugs">The bugs<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>A lot of integrators watch their rate limit usage very closely. We got two really interesting bug reports in the weeks following our release:</p>
<ol>
<li>Some clients observed that their <code>X-RateLimit-Reset</code> header value “wobbled” – it might show <code>2020-01-01 10:00:00</code> for one request, but <code>2020-01-01 10:00:01</code> on another request (with one second difference).</li>
<li>Some clients had their requests <em>rejected</em> for being over the limit, but the response headers said <code>X-RateLimit-Remaining: 5000</code>. That didn&#8217;t make sense: if they had a full rate limit window ahead of them, why was the request rejected?</li>
</ol>
<p>How odd!</p>
<h2 id="fix-1-manage-reset-at-in-application-code"><a class="heading-link" href="#fix-1-manage-reset-at-in-application-code">Fix 1: Manage “reset at” in application code<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>We were optimistic about using Redis’s built-in time-to-live (TTL) to implement our “reset at” feature. But it turns out, my implementation caused the “wobble” described above.</p>
<p>The Lua script returned the TTL of the client’s rate limit value, and then in Ruby, it was added to <code>Time.now.to_i</code> to get a timestamp for the <code>X-RateLimit-Reset</code> header. The problem was, time <em>passes</em> between the call to TTL (in Redis) and <code>Time.now.to_i</code> (in Ruby). Depending exactly how much time, and where it fell on the clock’s second boundary, the resulting timestamp might be different. For example, consider the following calls:</p>
<div data-target="content-table-wrap.container" class="content-table-wrap"><content-table-wrap><table>
<tr>
<th>Redis call begins</th>
<th>latency</th>
<th>TTL (Redis)</th>
<th>latency</th>
<th>Time.now returns</th>
<th>sum of TTL and Time.now</th>
</tr>
<tr>
<td>
10:00:04.2
</td>
<td>0.1</td>
<td>5</td>
<td>0.1</td>
<td>10:00:05.4</td>
<td>10:00:10.1</td>
</tr>
<tr>
<td>(then, a half-second later)</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>10:00:05.9</td>
<td>0.05</td>
<td>5</td>
<td>0.1</td>
<td>10:00:06.05</td>
<td>10:00:11.05</td>
</tr>
</table></content-table-wrap></div>
<p>In that case, since the second boundary happened <em>between</em> the call to TTL and <code>Time.now</code>, the resulting timestamp was one second <em>bigger</em> than the previous ones.</p>
<p>We could have tried increasing the precision of this operation (eg, Redis PTTL), but there would <em>still</em> have been some wobble, even if it was greatly reduced.</p>
<p>Another possibility was to calculate the time using <em>only</em> Redis, instead of mixing Ruby and Redis calls to create it. Redis’s <code>TIME</code> command could have been used as the source of truth. (Old Redis versions didn’t allow <code>TIME</code> in Lua scripts, but Redis 5+ does.) We avoided this design because it would have been harder to test: by using Ruby’s time as the source of truth, I could time-travel in my tests with Timecop, asserting that expired keys were handled correctly without actually <em>waiting</em> for Redis’s calls to the system clock to return true, future times. (I still had to wait on Redis to test the <code>EXPIRE</code>-based database cleanup, but since <code>expires_at</code> came from Ruby-land, I could inject very short expiration windows to simplify testing.)</p>
<p>Instead, we decided to <em>persist</em> the “reset at” time from Ruby in the database. That way, we could be sure it wouldn’t wobble. (Wobbling was an effect of the <em>calculation</em> – but reading from the database would guarantee a stable value.) Instead of reading TTL from Redis, we stored another value in the database (effectively doubling our storage footprint, but OK).</p>
<p>We still applied a TTL to rate limit keys, but they were set for one second <em>after</em> the “reset at” time. That way, we could use Redis’s own semantics to clean up “dead” rate limit windows.</p>
<h2 id="fix-2-account-for-expiration-in-replicas"><a class="heading-link" href="#fix-2-account-for-expiration-in-replicas">Fix 2: Account for expiration in replicas<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>Weirdly, many clients reported <em>rejections</em> that included <code>X-RateLimit-Remaining: 5000</code> headers. What’s going on!?</p>
<p>We found another problem that worked like this:</p>
<ol>
<li>At the beginning of the request, check the client’s current rate limit value. If it’s over the maximum allowed limit, prepare a rejection response.</li>
<li>Before delivering the response, increment the current rate limit value, and use the response to populate the <code>X-RateLimit-...</code> headers.</li>
</ol>
<p>Well, it turned out that Step 1 above hit a Redis <em>replica</em>, since it was a read operation. The read operation returned information about the client’s previous window, and the application prepared a rejection response.</p>
<p>Then, Step 2 would hit a Redis <em>primary</em>. During that database call, Redis would expire the previous window data and return data for a <em>fresh</em> rate limit. This is a known limitation of Redis: replicas don’t expire data until they receive instructions to do so from their primaries, and primaries don’t expire keys until they’re accessed (<a href="https://github.com/redis/redis/issues/187" rel="noopener" target="_blank">GitHub issue</a>). (In fact, primaries <em>do</em> randomly sample keys from time to time, expiring them as appropriate, see “<a href="https://redis.io/commands/expire#how-redis-expires-keys" rel="noopener" target="_blank">How Redis Expires Keys</a>”.)</p>
<p>Addressing this issue required two things:</p>
<ul>
<li>Basically, the same fix as above: instead of relying on Redis’s TTL to expire old rate limit windows, we needed to manage that feature in the application. (The application should be prepared to read stale data from replicas, then ignore it.)</li>
<li>Even after fixing that, a better design was required: in the case of rate-limited requests, we should avoid a second call to the database. The client’s window might expire between the two calls, resulting in the kind of inconsistent response described above. This fix required improving the Ruby code that prepared responses so that the response from Step 1 above was used to populate <code>X-RateLimit-...</code> headers.</li>
</ul>
<h2 id="the-final-scripts"><a class="heading-link" href="#the-final-scripts">The final scripts<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>Here are the Lua scripts we ended up with for implementing this pattern:</p>
<pre><code>RATE_SCRIPT:
-- count a request for a client
-- and return the current state for the client
-- rename the inputs for clarity below
local rate_limit_key = KEYS[1]
local increment_amount = tonumber(ARGV[1])
local next_expires_at = tonumber(ARGV[2])
local current_time = tonumber(ARGV[3])
local expires_at_key = rate_limit_key .. ":exp"
local expires_at = tonumber(redis.call("get", expires_at_key))
if not expires_at or expires_at &lt; current_time then
-- this is either a brand new window,
-- or this window has closed, but redis hasn't cleaned up the key yet
-- (redis will clean it up in one more second)
-- initialize a new rate limit window
redis.call("set", rate_limit_key, 0)
redis.call("set", expires_at_key, next_expires_at)
-- tell Redis to clean this up _one second after_ the expires-at time.
-- that way, clock differences between Ruby and Redis won't cause data to disappear.
-- (Redis will only clean up these keys "long after" the window has passed)
redis.call("expireat", rate_limit_key, next_expires_at + 1)
redis.call("expireat", expires_at_key, next_expires_at + 1)
-- since the database was updated, return the new value
expires_at = next_expires_at
end
-- Now that the window is either known to already exist _or_ be freshly initialized,
-- increment the counter (`incrby` returns a number)
local current = redis.call("incrby", rate_limit_key, increment_amount)
return { current, expires_at }
-- CHECK_SCRIPT:
-- Getting both the value and the expiration
-- of key as needed by our algorithm needs to be ran
-- in an atomic way, hence the script.
-- rename the inputs for clarity below
local rate_limit_key = KEYS[1]
local expires_at_key = rate_limit_key .. ":exp"
local current_time = tonumber(ARGV[1])
local tries = tonumber(redis.call("get", rate_limit_key))
local expires_at = nil -- maybe overridden below
if not tries then
-- this client hasn't initialized a window yet
-- let this fall through to returning {nil, nil},
-- where the application will provide defaults
else
-- we found a number of tries, now check
-- if this window is actually expired
expires_at = tonumber(redis.call("get", expires_at_key))
if not expires_at or expires_at &lt; current_time then
-- this window hasn't been cleaned up by Redis yet, but it has closed.
-- (maybe it was _partly_ cleaned up, if we found `tries` but not `expires_at`)
-- ignore the data in the database; return a fresh window instead
tries = nil
expires_at = nil
end
end
-- Maybe {nil, nil} if the window is brand new (or expired)
return { tries, expires_at }
</code></pre>
<h2 id="conclusion"><a class="heading-link" href="#conclusion">Conclusion<span class="heading-hash pl-2 text-italic text-bold" aria-hidden="true"></span></a></h2>
<p>We’ve learned a lot from this new approach, but there’s still one shortcoming we’re considering: the current implementation doesn’t increment the “current” rate limit value until after the request is <em>finished</em>. We do this because we don’t charge clients for <code>304 Not Modified</code> responses (this can happen when the client provides an E-Tag). A better implementation might increment the value when the request <em>starts</em>, then refunds the client if the response is <code>304</code>. That would prevent some edge cases where a client can exceed its limit when the final allowed request is still being processed.</p>
<p>After working out the issues described in this post, the new rate limiter has worked great. It has improved reliability, fixed issues for clients, and reduced our support load (eventually 😉) and the architecture is ready for our next wave of platform improvements.</p>
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