{"action":"created","comment":{"url":"https://api.github.com/repos/prometheus/client_golang/pulls/comments/75051000","id":75051000,"diff_hunk":"@@ -216,7 +228,7 @@ func (m *MetricVec) hashLabelValues(vals []string) (uint64, error) {\n \t}\n \th := hashNew()\n \tfor _, val := range vals {\n-\t\th = hashAdd(h, val)\n+\t\th = m.hashAdd(h, val)","path":"prometheus/vec.go","position":148,"original_position":132,"commit_id":"4db77b04a8bc8b6675556a53bed22fad14d05db5","original_commit_id":"0992f45691b3b5a3d295e69e2d05b641b3ea8d33","user":{"login":"stevvooe","id":120601,"avatar_url":"https://avatars.githubusercontent.com/u/120601?v=3","gravatar_id":"","url":"https://api.github.com/users/stevvooe","html_url":"https://github.com/stevvooe","followers_url":"https://api.github.com/users/stevvooe/followers","following_url":"https://api.github.com/users/stevvooe/following{/other_user}","gists_url":"https://api.github.com/users/stevvooe/gists{/gist_id}","starred_url":"https://api.github.com/users/stevvooe/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevvooe/subscriptions","organizations_url":"https://api.github.com/users/stevvooe/orgs","repos_url":"https://api.github.com/users/stevvooe/repos","events_url":"https://api.github.com/users/stevvooe/events{/privacy}","received_events_url":"https://api.github.com/users/stevvooe/received_events","type":"User","site_admin":false},"body":"> The 0xFF character can never be part of a valid UTF-8 string. That qualifies it as a good separator character during hashing.\r\n\r\nI don't see this link but I've used the constant `model.SeparatorByte`.\r\n\r\nTo give you context, we had a [sort error](https://github.com/docker/distribution/pull/1888) in the docker registry API due to the use of a `/` that sorts earlier than a `-`. Changing to `0x00` gives you expected, lexical sort order.","created_at":"2016-08-17T01:37:59Z","updated_at":"2016-08-17T01:37:59Z","html_url":"https://github.com/prometheus/client_golang/pull/221#discussion_r75051000","pull_request_url":"https://api.github.com/repos/prometheus/client_golang/pulls/221","_links":{"self":{"href":"https://api.github.com/repos/prometheus/client_golang/pulls/comments/75051000"},"html":{"href":"https://github.com/prometheus/client_golang/pull/221#discussion_r75051000"},"pull_request":{"href":"https://api.github.com/repos/prometheus/client_golang/pulls/221"}}},"pull_request":{"url":"https://api.github.com/repos/prometheus/client_golang/pulls/221","id":81052188,"html_url":"https://github.com/prometheus/client_golang/pull/221","diff_url":"https://github.com/prometheus/client_golang/pull/221.diff","patch_url":"https://github.com/prometheus/client_golang/pull/221.patch","issue_url":"https://api.github.com/repos/prometheus/client_golang/issues/221","number":221,"state":"open","locked":false,"title":"metricvec: handle hash collision for labeled metrics","user":{"login":"stevvooe","id":120601,"avatar_url":"https://avatars.githubusercontent.com/u/120601?v=3","gravatar_id":"","url":"https://api.github.com/users/stevvooe","html_url":"https://github.com/stevvooe","followers_url":"https://api.github.com/users/stevvooe/followers","following_url":"https://api.github.com/users/stevvooe/following{/other_user}","gists_url":"https://api.github.com/users/stevvooe/gists{/gist_id}","starred_url":"https://api.github.com/users/stevvooe/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevvooe/subscriptions","organizations_url":"https://api.github.com/users/stevvooe/orgs","repos_url":"https://api.github.com/users/stevvooe/repos","events_url":"https://api.github.com/users/stevvooe/events{/privacy}","received_events_url":"https://api.github.com/users/stevvooe/received_events","type":"User","site_admin":false},"body":"While hash collisions are quite rare, the current state of the client\r\nlibrary carries a risk of merging two separate label values into a\r\nsingle metric bucket. The effects are near impossible to detect and the\r\nresult will be missing or incorrect counters.\r\n\r\nThis changeset handles hash collisions by falling back to collision\r\nresolution if multiple label values hash to the same value. This works\r\nsimilar to separate chaining using a slice. Extra storage is minimized\r\nto only the value key slice to that metrics can be differentiated\r\nwithin a bucket.\r\n\r\nIn general, the cost of handling collisions is completely minimized\r\nunder normal operation. Performance does show slight increases in\r\ncertain areas, but these are more likely statistically anomalies. More\r\nimportantly, zero allocation behavior for metrics is preserved on the\r\nfast path. Minimal allocations may be made during collision handling but\r\nthis has minimal effect.\r\n\r\nBenchmark comparisons with and without collision resolution follow.\r\n\r\n```\r\nbenchmark                                                         old ns/op     new ns/op     delta\r\nBenchmarkCounterWithLabelValues-4                                 99.0          107           +8.08%\r\nBenchmarkCounterWithLabelValuesConcurrent-4                       79.6          91.0          +14.32%\r\nBenchmarkCounterWithMappedLabels-4                                518           542           +4.63%\r\nBenchmarkCounterWithPreparedMappedLabels-4                        127           137           +7.87%\r\nBenchmarkCounterNoLabels-4                                        19.5          19.1          -2.05%\r\nBenchmarkGaugeWithLabelValues-4                                   97.4          110           +12.94%\r\nBenchmarkGaugeNoLabels-4                                          12.4          10.3          -16.94%\r\nBenchmarkSummaryWithLabelValues-4                                 1204          915           -24.00%\r\nBenchmarkSummaryNoLabels-4                                        936           847           -9.51%\r\nBenchmarkHistogramWithLabelValues-4                               147           147           +0.00%\r\nBenchmarkHistogramNoLabels-4                                      50.6          49.3          -2.57%\r\nBenchmarkHistogramObserve1-4                                      37.9          37.5          -1.06%\r\nBenchmarkHistogramObserve2-4                                      122           137           +12.30%\r\nBenchmarkHistogramObserve4-4                                      310           352           +13.55%\r\nBenchmarkHistogramObserve8-4                                      691           729           +5.50%\r\nBenchmarkHistogramWrite1-4                                        3374          3097          -8.21%\r\nBenchmarkHistogramWrite2-4                                        5310          5051          -4.88%\r\nBenchmarkHistogramWrite4-4                                        12094         10690         -11.61%\r\nBenchmarkHistogramWrite8-4                                        19416         17755         -8.55%\r\nBenchmarkHandler-4                                                11934304      13765894      +15.35%\r\nBenchmarkSummaryObserve1-4                                        1119          1105          -1.25%\r\nBenchmarkSummaryObserve2-4                                        3679          3430          -6.77%\r\nBenchmarkSummaryObserve4-4                                        10678         7982          -25.25%\r\nBenchmarkSummaryObserve8-4                                        22974         16689         -27.36%\r\nBenchmarkSummaryWrite1-4                                          25962         14680         -43.46%\r\nBenchmarkSummaryWrite2-4                                          38019         35073         -7.75%\r\nBenchmarkSummaryWrite4-4                                          78027         56816         -27.18%\r\nBenchmarkSummaryWrite8-4                                          117220        132248        +12.82%\r\nBenchmarkMetricVecWithLabelValuesBasic-4                          138           133           -3.62%\r\nBenchmarkMetricVecWithLabelValues2Keys10ValueCardinality-4        150           144           -4.00%\r\nBenchmarkMetricVecWithLabelValues4Keys10ValueCardinality-4        263           256           -2.66%\r\nBenchmarkMetricVecWithLabelValues2Keys100ValueCardinality-4       145           155           +6.90%\r\nBenchmarkMetricVecWithLabelValues10Keys100ValueCardinality-4      606           634           +4.62%\r\nBenchmarkMetricVecWithLabelValues10Keys1000ValueCardinality-4     746           641           -14.08%\r\n\r\nbenchmark                                                         old allocs     new allocs     delta\r\nBenchmarkCounterWithLabelValues-4                                 0              0              +0.00%\r\nBenchmarkCounterWithLabelValuesConcurrent-4                       0              0              +0.00%\r\nBenchmarkCounterWithMappedLabels-4                                2              2              +0.00%\r\nBenchmarkCounterWithPreparedMappedLabels-4                        0              0              +0.00%\r\nBenchmarkCounterNoLabels-4                                        0              0              +0.00%\r\nBenchmarkGaugeWithLabelValues-4                                   0              0              +0.00%\r\nBenchmarkGaugeNoLabels-4                                          0              0              +0.00%\r\nBenchmarkSummaryWithLabelValues-4                                 0              0              +0.00%\r\nBenchmarkSummaryNoLabels-4                                        0              0              +0.00%\r\nBenchmarkHistogramWithLabelValues-4                               0              0              +0.00%\r\nBenchmarkHistogramNoLabels-4                                      0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValuesBasic-4                          0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValues2Keys10ValueCardinality-4        0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValues4Keys10ValueCardinality-4        0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValues2Keys100ValueCardinality-4       0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValues10Keys100ValueCardinality-4      0              0              +0.00%\r\nBenchmarkMetricVecWithLabelValues10Keys1000ValueCardinality-4     0              0              +0.00%\r\n\r\nbenchmark                                                         old bytes     new bytes     delta\r\nBenchmarkCounterWithLabelValues-4                                 0             0             +0.00%\r\nBenchmarkCounterWithLabelValuesConcurrent-4                       0             0             +0.00%\r\nBenchmarkCounterWithMappedLabels-4                                336           336           +0.00%\r\nBenchmarkCounterWithPreparedMappedLabels-4                        0             0             +0.00%\r\nBenchmarkCounterNoLabels-4                                        0             0             +0.00%\r\nBenchmarkGaugeWithLabelValues-4                                   0             0             +0.00%\r\nBenchmarkGaugeNoLabels-4                                          0             0             +0.00%\r\nBenchmarkSummaryWithLabelValues-4                                 0             0             +0.00%\r\nBenchmarkSummaryNoLabels-4                                        0             0             +0.00%\r\nBenchmarkHistogramWithLabelValues-4                               0             0             +0.00%\r\nBenchmarkHistogramNoLabels-4                                      0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValuesBasic-4                          0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValues2Keys10ValueCardinality-4        0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValues4Keys10ValueCardinality-4        0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValues2Keys100ValueCardinality-4       0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValues10Keys100ValueCardinality-4      0             0             +0.00%\r\nBenchmarkMetricVecWithLabelValues10Keys1000ValueCardinality-4     0             0             +0.00%\r\n```\r\n\r\nSigned-off-by: Stephen J Day <stephen.day@docker.com>\r\n\r\nCloses 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