README
¶
Jaeger - a Distributed Tracing System
Jaeger, inspired by Dapper and OpenZipkin, is a distributed tracing system released as open source by Uber Technologies. It can be used for monitoring microservices-based distributed systems:
- Distributed context propagation
- Distributed transaction monitoring
- Root cause analysis
- Service dependency analysis
- Performance / latency optimization
See also:
- Jaeger documentation for getting started, operational details, and other information.
- Blog post Evolving Distributed Tracing at Uber.
- Tutorial / walkthrough Take OpenTracing for a HotROD ride.
Jaeger is hosted by the Cloud Native Computing Foundation (CNCF). If you are a company that wants to help shape the evolution of technologies that are container-packaged, dynamically-scheduled and microservices-oriented, consider joining the CNCF. For details about who's involved and how Jaeger plays a role, read the CNCF announcement.
Features
High Scalability
Jaeger backend is designed to have no single points of failure and to scale with the business needs. For example, any given Jaeger installation at Uber is typically processing several billions of spans per day.
Native support for OpenTracing
Jaeger backend, Web UI, and instrumentation libraries have been designed from ground up to support the OpenTracing standard.
- Represent traces as directed acyclic graphs (not just trees) via span references
- Support strongly typed span tags and structured logs
- Support general distributed context propagation mechanism via baggage
Multiple storage backends
Jaeger supports two popular open source NoSQL databases as trace storage backends: Cassandra 3.4+ and Elasticsearch 5.x/6.x. There are ongoing community experiments using other databases, such as ScyllaDB, InfluxDB, Amazon DynamoDB. Jaeger also ships with a simple in-memory storage for testing setups.
Modern Web UI
Jaeger Web UI is implemented in Javascript using popular open source frameworks like React. Several performance improvements have been released in v1.0 to allow the UI to efficiently deal with large volumes of data, and to display traces with tens of thousands of spans (e.g. we tried a trace with 80,000 spans).
Cloud Native Deployment
Jaeger backend is distributed as a collection of Docker images. The binaries support various configuration methods, including command line options, environment variables, and configuration files in multiple formats (yaml, toml, etc.) Deployment to Kubernetes clusters is assisted by Kubernetes templates and a Helm chart.
Observability
All Jaeger backend components expose Prometheus metrics by default (other metrics backends are also supported). Logs are written to standard out using the structured logging library zap.
Backwards compatibility with Zipkin
Although we recommend instrumenting applications with OpenTracing API and binding to Jaeger client libraries to benefit from advanced features not available elsewhere, if your organization has already invested in the instrumentation using Zipkin libraries, you do not have to rewrite all that code. Jaeger provides backwards compatibility with Zipkin by accepting spans in Zipkin formats (Thrift or JSON v1/v2) over HTTP. Switching from Zipkin backend is just a matter of routing the traffic from Zipkin libraries to the Jaeger backend.
Related Repositories
Documentation
- Published: https://www.jaegertracing.io/docs/
- Source: https://github.com/jaegertracing/documentation
Instrumentation Libraries
Deployment
Components
Building From Source
See CONTRIBUTING.
Contributing
See CONTRIBUTING.
Maintainers
Below are the official maintainers of the Jaeger project. Please use @jaegertracing/jaeger-maintainers to tag them on issues / PRs.
- @black-adder
- @jpkrohling
- @pavolloffay
- @vprithvi
- @yurishkuro
Some repositories under jaegertracing org have additional maintainers.
Project Status Bi-Weekly Meeting
The Jaeger contributors meet bi-weekly, and everyone is welcome to join. Agenda and meeting details here.
Roadmap
See https://www.jaegertracing.io/docs/roadmap/
Questions, Discussions, Bug Reports
Reach project contributors via these channels:
Adopters
Jaeger as a product consists of multiple components. We want to support different types of users, whether they are only using our instrumentation libraries or full end to end Jaeger installation, whether it runs in production or you use it to troubleshoot issues in development.
Please see ADOPTERS.md for some of the organizations using Jaeger today. If you would like to add your organization to the list, please comment on our survey issue.
License
Documentation
Source Files
Directories
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| Path | Synopsis |
|---|---|
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cmd
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builder
Package builder defines builder resources (like logger and metrics) shared by jaeger components They are defined in this shared location so that if several components are wired into a single binary (e.g.
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Package builder defines builder resources (like logger and metrics) shared by jaeger components They are defined in this shared location so that if several components are wired into a single binary (e.g. |
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flags
Package flags defines command line flags that are shared by several jaeger components.
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Package flags defines command line flags that are shared by several jaeger components. |
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query/app/ui
Package ui installs UI assets packaged with github.com/rakyll/statik.
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Package ui installs UI assets packaged with github.com/rakyll/statik. |
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query/app/ui/actual/statik
Package statik is reserved for code generated by statik
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Package statik is reserved for code generated by statik |
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query/app/ui/placeholder/statik
Package statik is a placeholder for UI assets packaged with github.com/rakyll/statik.
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Package statik is a placeholder for UI assets packaged with github.com/rakyll/statik. |
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examples
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hotrod/services/driver/thrift-gen/driver
Package driver is generated code used to make or handle TChannel calls using Thrift.
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Package driver is generated code used to make or handle TChannel calls using Thrift. |
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hotrod/services/frontend/statik
Package statik contains static assets.
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Package statik contains static assets. |
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Package model describes the internal data model for Trace and Span
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Package model describes the internal data model for Trace and Span |
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adjuster
Package adjuster contains various adjusters for model.Trace.
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Package adjuster contains various adjusters for model.Trace. |
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converter
Package converter contains various utilities for converting model.Trace to/from other data modes, like Thrift, or UI JSON.
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Package converter contains various utilities for converting model.Trace to/from other data modes, like Thrift, or UI JSON. |
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converter/json
Package json allows converting model.Trace to external JSON data model.
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Package json allows converting model.Trace to external JSON data model. |
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converter/thrift
Package thrift allows converting model.Trace to/from various thrift models.
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Package thrift allows converting model.Trace to/from various thrift models. |
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converter/thrift/jaeger
Package jaeger allows converting model.Trace to/from jaeger.thrift model.
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Package jaeger allows converting model.Trace to/from jaeger.thrift model. |
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converter/thrift/zipkin
Package zipkin allows converting model.Trace to/from zipkin.thrift model.
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Package zipkin allows converting model.Trace to/from zipkin.thrift model. |
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json
Package json defines the external JSON representation for Jaeger traces.
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Package json defines the external JSON representation for Jaeger traces. |
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prototest
Package prototest is a generated protocol buffer package.
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Package prototest is a generated protocol buffer package. |
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Package pkg is the collection of utility packages used by the Jaeger components without being specific to its internals.
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Package pkg is the collection of utility packages used by the Jaeger components without being specific to its internals. |
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metrics
Package metrics provides command line flags for configuring the metrics backend.
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Package metrics provides command line flags for configuring the metrics backend. |
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Package plugin is the collection of implementations of different interfaces defined across Jaeger
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Package plugin is the collection of implementations of different interfaces defined across Jaeger |
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Package storage is the collection of different storage interfaces that are shared by two or more components.
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Package storage is the collection of different storage interfaces that are shared by two or more components. |
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swagger-gen
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restapi
Package restapi Zipkin API Zipkin's v2 api currently includes a POST endpoint that can receive spans.
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Package restapi Zipkin API Zipkin's v2 api currently includes a POST endpoint that can receive spans. |
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thrift-gen
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baggage
Package baggage is generated code used to make or handle TChannel calls using Thrift.
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Package baggage is generated code used to make or handle TChannel calls using Thrift. |
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jaeger
Package jaeger is generated code used to make or handle TChannel calls using Thrift.
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Package jaeger is generated code used to make or handle TChannel calls using Thrift. |
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sampling
Package sampling is generated code used to make or handle TChannel calls using Thrift.
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Package sampling is generated code used to make or handle TChannel calls using Thrift. |
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zipkincore
Package zipkincore is generated code used to make or handle TChannel calls using Thrift.
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Package zipkincore is generated code used to make or handle TChannel calls using Thrift. |