Adds Rate limiting sampler #819

devinsba · 2018-10-31T15:37:47Z

The rate-limited sampler allows you to choose an amount of traces to accept on a per-second interval. The minimum number is 0 and the max is 2,147,483,647 (max int).

For example, to allow 10 traces per second, you'd initialize the following:

tracingBuilder.sampler(RateLimitingSampler.create(10));

Appropriate Usage

If the rate is 10 or more traces per second, an attempt is made to distribute the accept decisions equally across the second. For example, if the rate is 100, 10 will pass every decisecond as opposed to bunching all pass decisions at the beginning of the second.

This sampler is efficient, but not as efficient as the BoundarySampler. However, this sampler is insensitive to the trace ID and will operate correctly even if they are not perfectly random.

Implementation

The implementation uses System.nanoTime() and tracks how many yes decisions occur across a second window. When the rate is at least 10/s, the yes decisions are equally split over 10 deciseconds, allowing a roll-over of unused yes decisions up until the end of the second.

Prior art

RateLimitingSampler was made to allow Amazon X-Ray rules to be expressed in Brave. We considered their Reservoir design. Our implementation differs as it removes a race condition and attempts to be more fair by distributing accept decisions every decisecond. If aws/aws-xray-sdk-java#47 is merged, we'll have the same implementation!

Thanks!

Thanks @devinsba for spiking the implementation and @anuraaga for suggesting how to be more fair when sampling large numbers of requests. Also appreciate review from @huydx and @zeagord

brave/src/main/java/brave/sampler/RateLimitingSampler.java

codefromthecrypt · 2018-11-04T06:33:53Z

@anuraaga @trustin fun change to look at. We are trying to include a java 6 compat dependency free non-blocking rate limited sampler. For simplicity this would allow the bucket to empty immediately (ex if 1000 requests/second we don't partition it into 10millis buckets, rather one big bucket and so if all requests deplete in the first millis, so be it).

That said, what thoughts have you on the impl and where we go from here. This is one of the most requested features and is a gap as folks try to bridge from the AWS sdk which has a similar impl but using clock time instead.

codefromthecrypt · 2018-11-04T06:38:38Z

@devinsba question around license headers.. yeah this can wait. we do package the LICENSE file since a long time.

anuraaga

I'd advocate for buckets, it does add some complexity but don't know if it's a huge amount. It feels weird to me that a periodic process that always runs towards the end of a second has basically no chance of ever being sampled.

brave/src/main/java/brave/sampler/RateLimitingSampler.java

codefromthecrypt · 2018-11-11T23:36:00Z

I would say add decrementBy to brave.internal.Platform in jre less than 8 it would be a loop, but that's ok as many will use the normal method.

…

On Sun, 11 Nov 2018, 20:23 Brian Devins-Suresh, ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In brave/src/main/java/brave/sampler/RateLimitingSampler.java <#819 (comment)>: > + this.tracesPerSecond = tracesPerSecond; + this.usage = new AtomicLong(0); + this.nextUpdate = new AtomicLong(getNextUpdateValue(System.nanoTime())); + } + + + @OverRide public boolean isSampled(long ignoredTraceId) { + long now = System.nanoTime(); + long updateAt = nextUpdate.get(); + + // now is past update time OR + // (update time is positive (near Long.MAX_VALUE) AND now is negative (long overflow)) + if (now > updateAt || (updateAt > 0 && now < 0)) { + if (nextUpdate.compareAndSet(updateAt, getNextUpdateValue(updateAt))) { + usage.set(1); + return true; So all the decrement by functionality was added in Java 8 so we only have decrement by one available. Do we think it is important that first x requests per second is exactly adhered to? If we lost a single sample in favor of a later one would that be terrible? I'm having trouble finding a path without adding a synchronized block — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#819 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD615sJkHOpA8vUXlDYV-A2UWMXxR5kks5uuBbJgaJpZM4YEXB_> .

codefromthecrypt · 2018-11-12T04:24:19Z

gonna pull this local and try it out

codefromthecrypt · 2018-11-12T09:58:23Z

added a cleanup commit

codefromthecrypt · 2018-11-12T10:04:14Z

here are bench results. It does take time to issue nanoTime, so some overhead is normal. Keep in mind this only applies to first span in a trace and we are talking about operations per microsecond

Benchmark                                         (traceId)   Mode  Cnt    Score    Error   Units
SamplerBenchmarks.sampler_boundary     -9223372036854775808  thrpt   15  512.167 ± 20.785  ops/us
SamplerBenchmarks.sampler_boundary      1234567890987654321  thrpt   15  515.468 ± 26.426  ops/us
SamplerBenchmarks.sampler_counting     -9223372036854775808  thrpt   15   25.422 ±  1.467  ops/us
SamplerBenchmarks.sampler_counting      1234567890987654321  thrpt   15   26.166 ±  1.278  ops/us
SamplerBenchmarks.sampler_rateLimited  -9223372036854775808  thrpt   15   14.433 ±  0.650  ops/us
SamplerBenchmarks.sampler_rateLimited   1234567890987654321  thrpt   15   14.650 ±  0.336  ops/us

codefromthecrypt · 2018-11-12T10:35:16Z

I take back the advice for "I would say add decrementBy to brave.internal.Platform" it isn't needed.

brave/src/main/java/brave/sampler/RateLimitingSampler.java

codefromthecrypt · 2018-11-19T14:31:49Z

was thinking about the main problem with the "all samples at the beginning of the second" problem @devinsba @anuraaga. What if we setup some basic rules with a "rollover plan"

Ex.
if < 10/s allow all to happen at any time in the second
if <= 100/s bucket <=10/decisecond with a rollover.

ex rate is 100 and if no requests until the last decisecond, there are 100 available still, and 10 again after the next second turns. OTOH, if 13 requests happen in the first 2 deciseconds, the next decisecond has 17 max available.

then some function over that as the rate increases, either a higher magnitude per decisecond or smaller bucket than decisecond. Note: fixed buckets, especially few fixed buckets can allow for some interesting impls. Ex our counting sampler is cute due to known bounds https://github.com/openzipkin/brave/blob/master/brave/src/main/java/brave/sampler/CountingSampler.java

Thoughts?

codefromthecrypt · 2018-11-19T14:38:35Z

one reminder on the bucket thing is that the minimum rate in my suggestion is 1/s. it is easier code and matches Amazon's ReservoirSize https://docs.aws.amazon.com/xray/latest/api/API_SamplingRule.html slow rates like per minute or hour is complicated and I don't think we want to handle that until/unless explicitly requested

anuraaga · 2018-11-19T15:12:29Z

That SGTM - not thinking about per minute / hour seems fine since they would rarely sample less than 100%.

instrumentation/benchmarks/src/main/java/brave/sampler/SamplerBenchmarks.java

devinsba · 2018-11-29T15:21:56Z

If someone else has the time, energy, and know how to get this over the finish line I'd appreciate it. I've been sick and time has been tight.

codefromthecrypt · 2018-11-29T21:32:02Z

I have a long flight tomorrow.. my intention is to help.. unless they have 6 liam neeson films..

…

On Fri, Nov 30, 2018 at 2:21 AM Brian Devins-Suresh ***@***.***> wrote: If someone else has the time, energy, and know how to get this over the finish line I'd appreciate it. I've been sick and time has been tight. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

… cases

brave/src/main/java/brave/sampler/RateLimitingSampler.java

codefromthecrypt · 2018-12-07T14:58:19Z

if we do this we need to synchronize the value then also re adjust. since not everyone will set this dynamic and also we can set dynamic in a different way... what if instead the sampler itself is replaced?

…

On Fri, 7 Dec 2018, 22:46 0x6875790d0a ***@***.*** wrote: ***@***.**** commented on this pull request. ------------------------------ In brave/src/main/java/brave/sampler/RateLimitingSampler.java <#819 (comment)>: > + */ +public class RateLimitingSampler extends Sampler { + public static Sampler create(int tracesPerSecond) { + if (tracesPerSecond < 0) throw new IllegalArgumentException("tracesPerSecond < 0"); + if (tracesPerSecond == 0) return Sampler.NEVER_SAMPLE; + return new RateLimitingSampler(tracesPerSecond); + } + + static final long NANOS_PER_SECOND = TimeUnit.SECONDS.toNanos(1); + static final int NANOS_PER_DECISECOND = (int) (NANOS_PER_SECOND / 10); + + final MaxFunction maxFunction; + final AtomicInteger usage = new AtomicInteger(0); + final AtomicLong nextReset; + + RateLimitingSampler(int tracesPerSecond) { @adriancole <https://github.com/adriancole> personally I may want this variable to be reset-able, which mean that we could dynamically change it from outside. We may just need an apply function which take new tracesPerSecond and replace maxFunction with new one, HDYT? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#819 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD61yOogZfWrmX16n49323nDZVjPiWwks5u2nEigaJpZM4YEXB_> .

devinsba · 2018-12-07T15:00:43Z

To Note: I had intended to do the "replace the sampler" approach for the XRay wrapper of this

codefromthecrypt · 2018-12-07T15:02:26Z

reason I suggest doing dynamic adjustment externally is that it is in practice hard to guess how you will update.. would you pass AtomicInteger? a callback with a new rate? or we expect a synchronous call to setRate? there are multiple ways to update a value. Then as the change is defined someone also wants to compose a 5% overflow on top! in other words I would prefer to help solve the dynamic adjustment thing externally until we know how the rate is adjusted is actually shared.

huydx · 2018-12-07T15:03:38Z

@adriancole replace the sampler itself sounds better, totally forgot about that. Anw the implementation looks good for me.

codefromthecrypt · 2018-12-07T15:06:50Z

do we gonna make a builder?

nice thing about builder is we can add late. right now there is only one parameter so we can defer until there is more than one and still not break simple case

…

instrumentation/benchmarks/src/main/java/brave/sampler/SamplerBenchmarks.java

codefromthecrypt · 2018-12-10T09:11:02Z

I think all this needs is javadoc polishing and readme. @anuraaga are you happy with impl?

codefromthecrypt · 2018-12-10T09:26:47Z

Here are benchmark results:

Benchmark                                                                                           (traceId)    Mode     Cnt     Score   Error   Units
SamplerBenchmarks.sampler_rateLimited_1                                                  -9223372036854775808  sample  779286     0.153 ± 0.001   us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.00                      -9223372036854775808  sample             0.031           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.50                      -9223372036854775808  sample             0.140           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.90                      -9223372036854775808  sample             0.151           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.95                      -9223372036854775808  sample             0.154           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.99                      -9223372036854775808  sample             0.197           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.999                     -9223372036854775808  sample             7.321           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.9999                    -9223372036854775808  sample            14.022           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p1.00                      -9223372036854775808  sample           101.120           us/op
SamplerBenchmarks.sampler_rateLimited_1:·gc.alloc.rate                                   -9223372036854775808  sample      15     0.224 ± 0.031  MB/sec
SamplerBenchmarks.sampler_rateLimited_1:·gc.alloc.rate.norm                              -9223372036854775808  sample      15     0.013 ± 0.002    B/op
SamplerBenchmarks.sampler_rateLimited_1:·gc.count                                        -9223372036854775808  sample      15       ≈ 0          counts
SamplerBenchmarks.sampler_rateLimited_1                                                   1234567890987654321  sample  783515     0.149 ± 0.001   us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.00                       1234567890987654321  sample             0.032           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.50                       1234567890987654321  sample             0.140           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.90                       1234567890987654321  sample             0.150           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.95                       1234567890987654321  sample             0.154           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.99                       1234567890987654321  sample             0.186           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.999                      1234567890987654321  sample             3.119           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.9999                     1234567890987654321  sample            13.150           us/op
SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p1.00                       1234567890987654321  sample           130.176           us/op
SamplerBenchmarks.sampler_rateLimited_1:·gc.alloc.rate                                    1234567890987654321  sample      15     0.220 ± 0.023  MB/sec
SamplerBenchmarks.sampler_rateLimited_1:·gc.alloc.rate.norm                               1234567890987654321  sample      15     0.013 ± 0.001    B/op
SamplerBenchmarks.sampler_rateLimited_1:·gc.count                                         1234567890987654321  sample      15       ≈ 0          counts
SamplerBenchmarks.sampler_rateLimited_100                                                -9223372036854775808  sample  727518     0.153 ± 0.002   us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.00                  -9223372036854775808  sample             0.030           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.50                  -9223372036854775808  sample             0.140           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.90                  -9223372036854775808  sample             0.155           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.95                  -9223372036854775808  sample             0.165           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.99                  -9223372036854775808  sample             0.205           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.999                 -9223372036854775808  sample             8.560           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.9999                -9223372036854775808  sample            15.964           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p1.00                  -9223372036854775808  sample           110.848           us/op
SamplerBenchmarks.sampler_rateLimited_100:·gc.alloc.rate                                 -9223372036854775808  sample      15     0.240 ± 0.021  MB/sec
SamplerBenchmarks.sampler_rateLimited_100:·gc.alloc.rate.norm                            -9223372036854775808  sample      15     0.015 ± 0.001    B/op
SamplerBenchmarks.sampler_rateLimited_100:·gc.count                                      -9223372036854775808  sample      15       ≈ 0          counts
SamplerBenchmarks.sampler_rateLimited_100                                                 1234567890987654321  sample  725738     0.147 ± 0.001   us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.00                   1234567890987654321  sample             0.029           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.50                   1234567890987654321  sample             0.139           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.90                   1234567890987654321  sample             0.153           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.95                   1234567890987654321  sample             0.166           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.99                   1234567890987654321  sample             0.196           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.999                  1234567890987654321  sample             5.924           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.9999                 1234567890987654321  sample            13.140           us/op
SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p1.00                   1234567890987654321  sample            77.824           us/op
SamplerBenchmarks.sampler_rateLimited_100:·gc.alloc.rate                                  1234567890987654321  sample      15     0.229 ± 0.035  MB/sec
SamplerBenchmarks.sampler_rateLimited_100:·gc.alloc.rate.norm                             1234567890987654321  sample      15     0.015 ± 0.002    B/op
SamplerBenchmarks.sampler_rateLimited_100:·gc.count                                       1234567890987654321  sample      15       ≈ 0          counts

codefromthecrypt · 2018-12-10T09:27:54Z

I will repost benchmarks as I forgot to include gc data

codefromthecrypt · 2018-12-10T11:07:31Z

ran benchmarks against another tracer which won't be mentioned.. our results are an order of magnitude more efficient in terms of allocation and runtime.

brave/src/main/java/brave/sampler/RateLimitingSampler.java

codefromthecrypt · 2018-12-10T12:28:21Z

Polished up and ran against x-ray. Note their perf is expectedly a little quicker than ours at higher rates as we try to be fair. Also, they have a race condition resetting which we don't. I will raise a pull request to correct theirs.

SamplerBenchmarks.sampler_rateLimited_1:sampler_rateLimited_1·p0.999                  1234567890987654321  sample             8.128           us/op
SamplerBenchmarks.sampler_rateLimited_1:·gc.alloc.rate.norm                           1234567890987654321  sample      15     0.014 ± 0.002    B/op

SamplerBenchmarks.sampler_rateLimited_100:sampler_rateLimited_100·p0.999              1234567890987654321  sample             8.368           us/op
SamplerBenchmarks.sampler_rateLimited_100:·gc.alloc.rate.norm                         1234567890987654321  sample      15     0.015 ± 0.002    B/op

SamplerBenchmarks.sampler_rateLimited_1_xray:sampler_rateLimited_1_xray·p0.999       -9223372036854775808  sample             8.240           us/op
SamplerBenchmarks.sampler_rateLimited_1_xray:·gc.alloc.rate.norm                     -9223372036854775808  sample      15     0.008 ± 0.002    B/op

SamplerBenchmarks.sampler_rateLimited_100_xray:sampler_rateLimited_100_xray·p0.999   -9223372036854775808  sample             5.742           us/op
SamplerBenchmarks.sampler_rateLimited_100_xray:·gc.alloc.rate.norm                   -9223372036854775808  sample      15     0.007 ± 0.001    B/op

codefromthecrypt · 2018-12-10T12:56:27Z

added aws/aws-xray-sdk-java#47 to give back to amazon

brave/src/main/java/brave/sampler/RateLimitingSampler.java

devinsba · 2018-12-10T15:04:27Z

👍 Thanks for picking this up @adriancole, I'll see if I can find time to fix that XRay test today so your PR can get merged

codefromthecrypt · 2018-12-11T05:02:04Z

I will look into the test failure in aws/aws-xray-sdk-java#47 before merge. thanks!

codefromthecrypt · 2018-12-11T05:50:52Z

Amazon's test case found a legit glitch. Fixed in both places

* Improves reservoir to avoid a race condition and to be more fair This re-uses the implementation we just made in Brave based on feedback on yours. Enjoy! See openzipkin/brave#819 * Makes rate setting lazy

codefromthecrypt · 2018-12-13T00:28:10Z

whoot xray now has this impl aws/aws-xray-sdk-java#47

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non-blocking example cap5lut/cap5lut-ratelimits#1

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是否可以提供一个动态修改sleuth采样率的示例 apolloconfig/apollo#1610

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devinsba and others added 7 commits December 7, 2018 14:29

New resevoir based on xray with onlt java 6 apis

6ca3a94

WIP, not even close yet. Handoff to work computer

93b643a

Account for nanoTime() overflow

1d13999

Add a couple tests, need to explore the clock setup to check overflow…

ee62ad7

… cases

Avoids race condition

8d1682e

Signals intent of input arg

700d11e

Add javadoc for variable intent

f47733b

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newline

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added slow-path benchmarks

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polish

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codefromthecrypt changed the title ~~WIP - Rate limiting sampler~~ Adds Rate limiting sampler Dec 10, 2018

codefromthecrypt mentioned this pull request Dec 10, 2018

Improves reservoir to avoid a race condition and to be more fair aws/aws-xray-sdk-java#47

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adriancole added 2 commits December 10, 2018 22:38

max int

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min zero

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codefromthecrypt merged commit 3be55b5 into openzipkin:master Dec 11, 2018

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Adds Rate limiting sampler #819

Adds Rate limiting sampler #819

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Adds Rate limiting sampler #819

Adds Rate limiting sampler #819

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Appropriate Usage

Implementation

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Thanks!

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codefromthecrypt commented Dec 10, 2018

codefromthecrypt commented Dec 10, 2018

devinsba commented Dec 10, 2018

codefromthecrypt commented Dec 11, 2018

codefromthecrypt commented Dec 11, 2018

codefromthecrypt commented Dec 13, 2018

devinsba commented Oct 31, 2018 •

edited by codefromthecrypt

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codefromthecrypt commented Nov 12, 2018 •

edited

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codefromthecrypt commented Nov 19, 2018 •

edited

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anuraaga commented Nov 19, 2018 •

edited

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codefromthecrypt commented Dec 10, 2018 •

edited

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