157 lines
7.6 KiB
Text
157 lines
7.6 KiB
Text
== Jaeger
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*Name of project:* Jaeger
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*Description:*
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Jaeger, inspired by Dapper (https://research.google.com/pubs/pub36356.html) and OpenZipkin (http://zipkin.io/),
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is a distributed tracing system that can be used for monitoring microservice-based architectures, including
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distributed context propagation, distributed transaction monitoring, root cause analysis, service dependency
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analysis and performance / latency optimization.
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*Sponsor / Advisor from TOC:* Bryan Cantrill
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*Preferred maturity level:* incubating
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*Unique identifier:* jaeger
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*License:* Apache 2.0 (tentative)
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*Source control repositories:*
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* https://github.com/uber/jaeger
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* https://github.com/jaegertracing
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* https://github.com/uber/jaeger-lib
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* https://github.com/uber/jaeger-ui
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* https://github.com/uber/jaeger-client-go
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* https://github.com/uber/jaeger-client-java
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* https://github.com/uber/jaeger-client-node
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* https://github.com/uber/jaeger-client-python
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*Initial Committers:* https://github.com/uber/jaeger/blob/master/CODEOWNERS
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*Infrastructure requirements (CI / CNCF Cluster):* https://travis-ci.org/uber/jaeger
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*Issue tracker:* https://github.com/uber/jaeger/issues
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*Mailing list:* https://groups.google.com/forum/#!forum/jaeger-tracing
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*Online chat:* https://gitter.im/jaegertracing/
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*Website:* https://uber.github.io/jaeger/ (soon jaegertracing.io)
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*Documentation:* http://jaeger.readthedocs.io/
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*Release methodology and mechanics:*
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At the moment, releases happen in an ad hoc fashion, when the maintainers and core contributors think
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there are sufficient number of features or bug fixes to warrant a new release. For the main repo (Jaeger backend),
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the release is tagged on GitHub and it triggers a build of docker images that are auto-uploaded to Docker Hub.
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The releases for instrumentation libraries follow a similar process, and the artifacts are pushed to respective
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repositories for the language, i.e. Maven Central, npm, and pypi.
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*Roadmap:* http://jaeger.readthedocs.io/en/latest/roadmap/
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*Social media accounts:*
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* Blog: https://medium.com/jaegertracing/
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* Twitter: https://twitter.com/JaegerTracing
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*Existing sponsorship:* Uber has 7 full time maintainers and Red Hat has 4 full time maintainers
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*Contributor statistics:* 1000+ stars and 30+ contributors https://github.com/uber/jaeger/graphs/contributors
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*Adopters:* https://github.com/uber/jaeger/blob/master/ADOPTERS.md
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*External Dependencies:*
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* https://github.com/uber/jaeger
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** https://github.com/pkg/errors - BSD-2
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** https://github.com/uber-go/zap - MIT
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** https://github.com/apache/thrift - AL2
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** https://github.com/opentracing/opentracing-go - MIT
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** golang.org/x/net - BSD-3
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** https://github.com/uber/tchannel-go - MIT
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** https://github.com/gorilla/ - BSD-3
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** https://github.com/kr/pretty - MIT
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** https://github.com/go-kit/kit - MIT
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** http://github.com/olivere/elastic - MIT
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* https://github.com/jaegertracing
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** Apache-2.0
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* https://github.com/uber/jaeger-lib
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** https://github.com/codahale/hdrhistogram - MIT
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** https://github.com/go-kit/kit - MIT
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** https://github.com/uber-go/tally - MIT
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** https://github.com/prometheus/client_golang - AL2
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* https://github.com/uber/jaeger-ui
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** Many (see full list - https://gist.github.com/yurishkuro/273b5c0ed3556dfb84a095002f7dc40c)
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** "(GPL-2.0 OR MIT)"
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** "Apache-2.0"
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** "BSD"
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** "BSD*"
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** "BSD-2-Clause"
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** "BSD-3-Clause"
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** "ISC"
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** "MIT"
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** "MIT*"
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* https://github.com/uber/jaeger-client-go
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** https://github.com/apache/thrift - AL2
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** https://github.com/opentracing/opentracing-go - MIT
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** golang.org/x/net - BSD-3
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** https://github.com/uber/tchannel-go - MIT
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* https://github.com/uber/jaeger-client-java
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** https://mvnrepository.com/artifact/org.apache.thrift/libthrift - AL2
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** https://mvnrepository.com/artifact/io.opentracing/opentracing-api - AL2
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** https://mvnrepository.com/artifact/com.google.code.gson/gson - AL2
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** https://mvnrepository.com/artifact/org.slf4j/slf4j-api - MIT
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* https://github.com/uber/jaeger-client-node
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** https://www.npmjs.com/package/node-int64 - MIT
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** https://www.npmjs.com/package/thriftrw - MIT
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** https://www.npmjs.com/package/xorshift - MIT
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** https://www.npmjs.com/package/opentracing - MIT
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* https://github.com/uber/jaeger-client-python
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** https://pypi.python.org/pypi/futures - PSF
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** https://pypi.python.org/pypi/threadloop - MIT
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** https://pypi.python.org/pypi/thrift - AL2
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** https://pypi.python.org/pypi/tornado - AL2
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** https://pypi.python.org/pypi/opentracing - MIT
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** https://pypi.python.org/pypi/future - MIT
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*Statement on alignment with CNCF mission:*
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A challenging part of cloud native computing is managing microservices and especially debugging the situation
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when things go awry. Furthermore, distributed tracing instrumentation has been fragmented traditionally until
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CNCF efforts like the OpenTracing specification came to existence to help unify existing tracing implementations
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out there.
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Jaeger is a battle tested distributing system that takes advantage of OpenTracing and advances the state
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of open source distributed tracing.
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*Comparison with Zipkin*
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Zipkin is another popular open source distributed tracing system originally released by Twitter in 2012
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(https://blog.twitter.com/engineering/en_us/a/2012/distributed-systems-tracing-with-zipkin.html).
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Jaeger and Zipkin provide roughly similar functionality today; in fact the earlier versions of Jaeger relied on some of Zipkin
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components as explained in the Uber Eng blog post (https://eng.uber.com/distributed-tracing/). Listed below are some differences
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between Jaeger and Zipkin, along with how they can interoperate:
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* *OpenTracing Instrumentation Libraries*. All Jaeger instrumentation libraries are built to support the OpenTracing standard.
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Zipkin ecosystem has a couple of OpenTracing compatible libraries, but most of them do not support it, instead requiring the
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applications to use bespoke APIs and Zipkin-only semantic annotations.
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* *OpenTracing Compatible Backend and UI*. Jaeger is built with OpenTracing standard in mind from the ground up, including the
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backend, the data models, and the UI. Zipkin backend does not support all of the features of OpenTracing, specifically
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structured k-v span logs and multi-parent spans / DAGs (which are possible in OpenTracing via span references).
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* *Instrumentation Libraries Maintenance*. Jaeger instrumentation libraries are officially part of the project and undergo
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continuous integration testing against each other and against the backend. Zipkin instrumentation libraries are not officially
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part of the project, often not even located in the openzipkin Github org, and rarely integration-tested against each other.
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On the other hand, Zipkin libraries exist in more languages. Today Jaeger supports Go, Java, Python, and Javascript,
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with Ruby and C++ implementation on the way.
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* *Distributed Context Propagation*. General purpose context propagation is extremely useful in microservices based systems.
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In addition to tracing it can support many other applications, including resource attribution / chargebacks, capacity planning,
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chaos engineering, security. All Jaeger libraries support context propagation via OpenTracing feature called “baggage”.
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Most Zipkin libraries do not support propagation of custom context metadata.
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* *Storage Backends*. Zipkin supports more storage backends since it has been around a lot longer. Jaeger currently supports
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Cassandra and Elasticsearch as production quality storage backends.
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* *Interoperability*. Jaeger backend can be used as a replacement for Zipkin backend in organizations that already invested
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in Zipkin instrumentation. Jaeger instrumentation libraries can also be configured to interoperate with Zipkin libraries
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via Zipkin wire format (B3 headers), that allows new services to be instrumented with OpenTracing.
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