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Add a roundrobin connector, that can help single thread components to…
… scale (open-telemetry#32853)
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| # Use this changelog template to create an entry for release notes. | ||
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| # One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix' | ||
| change_type: new_component | ||
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| # The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver) | ||
| component: roundrobinconnector | ||
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| # A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`). | ||
| note: Add a roundrobin connector, that can help single thread components to scale | ||
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| # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists. | ||
| issues: [32853] | ||
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| # If your change doesn't affect end users or the exported elements of any package, | ||
| # you should instead start your pull request title with [chore] or use the "Skip Changelog" label. | ||
| # Optional: The change log or logs in which this entry should be included. | ||
| # e.g. '[user]' or '[user, api]' | ||
| # Include 'user' if the change is relevant to end users. | ||
| # Include 'api' if there is a change to a library API. | ||
| # Default: '[user]' | ||
| change_logs: [user, api] |
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| include ../../Makefile.Common |
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| # Round-Robin Connector | ||
| <!-- status autogenerated section --> | ||
| | Status | | | ||
| | ------------- |-----------| | ||
| | Distributions | [contrib] | | ||
| | Issues | [](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aconnector%2Froundrobin) [](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aconnector%2Froundrobin) | | ||
| | [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner) | [@bogdandrutu](https://www.github.com/bogdandrutu) | | ||
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| [beta]: https://github.com/open-telemetry/opentelemetry-collector#beta | ||
| [contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib | ||
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| ## Supported Pipeline Types | ||
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| | [Exporter Pipeline Type] | [Receiver Pipeline Type] | [Stability Level] | | ||
| | ------------------------ | ------------------------ | ----------------- | | ||
| | traces | traces | [beta] | | ||
| | metrics | metrics | [beta] | | ||
| | logs | logs | [beta] | | ||
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| [Exporter Pipeline Type]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/connector/README.md#exporter-pipeline-type | ||
| [Receiver Pipeline Type]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/connector/README.md#receiver-pipeline-type | ||
| [Stability Level]: https://github.com/open-telemetry/opentelemetry-collector#stability-levels | ||
| <!-- end autogenerated section --> | ||
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| The `roundrobin` connector can fork pipelines of the same type and equally split the load between them. | ||
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| ## Configuration | ||
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| If you are not already familiar with connectors, you may find it helpful to first visit the [Connectors README]. | ||
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| The `roundrobin` connector does not have any configuration settings. | ||
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| ```yaml | ||
| receivers: | ||
| otlp: | ||
| exporters: | ||
| prometheusremotewrite/1: | ||
| prometheusremotewrite/2: | ||
| connectors: | ||
| roundrobin: | ||
| ``` | ||
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| Preprocess data, then export using multiple exporter instances to scale the throughput if the exporter | ||
| does not support scale well (e.g. prometheusremotewrite). | ||
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| ```yaml | ||
| receivers: | ||
| otlp: | ||
| processors: | ||
| resourcedetection: | ||
| batch: | ||
| exporters: | ||
| prometheusremotewrite/1: | ||
| prometheusremotewrite/2: | ||
| connectors: | ||
| roundrobin: | ||
| service: | ||
| pipelines: | ||
| metrics: | ||
| receivers: [otlp] | ||
| processors: [resourcedetection, batch] | ||
| exporters: [roundrobin] | ||
| metrics/1: | ||
| receivers: [roundrobin] | ||
| exporters: [prometheusremotewrite/1] | ||
| metrics/2: | ||
| receivers: [roundrobin] | ||
| exporters: [prometheusremotewrite/2] | ||
| ``` | ||
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| [Connectors README]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/connector/README.md |
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| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| package roundrobinconnector // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/roundrobinconnector" | ||
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| // Config for the connector | ||
| type Config struct{} |
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| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| package roundrobinconnector // import "github.com/open-telemetry/opentelemetry-collector-contrib/connector/roundrobinconnector" | ||
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| import ( | ||
| "context" | ||
| "sync/atomic" | ||
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| "go.opentelemetry.io/collector/component" | ||
| "go.opentelemetry.io/collector/connector" | ||
| "go.opentelemetry.io/collector/consumer" | ||
| "go.opentelemetry.io/collector/pdata/plog" | ||
| "go.opentelemetry.io/collector/pdata/pmetric" | ||
| "go.opentelemetry.io/collector/pdata/ptrace" | ||
| ) | ||
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| func allConsumers[T any](r router[T]) ([]T, error) { | ||
| pipeIDs := r.PipelineIDs() | ||
| consumers := make([]T, len(pipeIDs)) | ||
| for i, pipeID := range pipeIDs { | ||
| cons, err := r.Consumer(pipeID) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| consumers[i] = cons | ||
| } | ||
| return consumers, nil | ||
| } | ||
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| type router[T any] interface { | ||
| PipelineIDs() []component.ID | ||
| Consumer(pipelineIDs ...component.ID) (T, error) | ||
| } | ||
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| func newLogs(nextConsumer consumer.Logs) (connector.Logs, error) { | ||
| nextConsumers, err := allConsumers[consumer.Logs](nextConsumer.(connector.LogsRouterAndConsumer)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &roundRobin{nextLogs: nextConsumers}, nil | ||
| } | ||
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| func newMetrics(nextConsumer consumer.Metrics) (connector.Metrics, error) { | ||
| nextConsumers, err := allConsumers[consumer.Metrics](nextConsumer.(connector.MetricsRouterAndConsumer)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &roundRobin{nextMetrics: nextConsumers}, nil | ||
| } | ||
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| func newTraces(nextConsumer consumer.Traces) (connector.Traces, error) { | ||
| nextConsumers, err := allConsumers[consumer.Traces](nextConsumer.(connector.TracesRouterAndConsumer)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &roundRobin{nextTraces: nextConsumers}, nil | ||
| } | ||
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| // roundRobin is used to pass signals directly from one pipeline to one of the configured once in a round-robin mode. | ||
| // This is useful when there is a need to scale (shard) data processing and downstream components do not | ||
| // handle concurrent requests very well. | ||
| type roundRobin struct { | ||
| component.StartFunc | ||
| component.ShutdownFunc | ||
| nextConsumer atomic.Uint64 | ||
| nextMetrics []consumer.Metrics | ||
| nextLogs []consumer.Logs | ||
| nextTraces []consumer.Traces | ||
| } | ||
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| func (rr *roundRobin) Capabilities() consumer.Capabilities { | ||
| return consumer.Capabilities{MutatesData: false} | ||
| } | ||
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| func (rr *roundRobin) ConsumeLogs(ctx context.Context, ld plog.Logs) error { | ||
| return rr.nextLogs[rr.nextConsumer.Add(1)%uint64(len(rr.nextLogs))].ConsumeLogs(ctx, ld) | ||
| } | ||
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| func (rr *roundRobin) ConsumeMetrics(ctx context.Context, md pmetric.Metrics) error { | ||
| return rr.nextMetrics[rr.nextConsumer.Add(1)%uint64(len(rr.nextMetrics))].ConsumeMetrics(ctx, md) | ||
| } | ||
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| func (rr *roundRobin) ConsumeTraces(ctx context.Context, td ptrace.Traces) error { | ||
| return rr.nextTraces[rr.nextConsumer.Add(1)%uint64(len(rr.nextTraces))].ConsumeTraces(ctx, td) | ||
| } |
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