CHANGES.md

0.7.5

• Beautiful new linkerd docs!!! 😍 https://linkerd.io/config/0.7.5/linkerd
• HTTP response classifiers must not consider a request to be retryable when it has a chunked request body.
• Fix query paramater encoding when rewriting proxied requests
• Improve error handling and retry behavior of consul plugins.
• Add useHealthCheck parameter to Consul Namer #589
• The k8s namer will now resume watches if the connection is closed.
• Improved the performance of the namerd HTTP API.
• Configured namers are now available to other plugins
• enableProbation is now disabled by default on clients. It leads to unexpected behavior in environments that reuse IP:PORT pairs across services in a close time proximity.

0.7.4

• Dashboard: add toggling to the router clients to better handle large numbers of clients
• namerd HTTP API:
  • Add resolve endpoint
  • All endpoints return json
• Add authority metadata field to re-write HTTP host/:authority on demand
• Consul improvements:
  • Add setHost parameter for Consul CatalogNamer to set authority metadata
  • Add auth token parameter to Consul Namer & Dtab Store
  • Add datacenter parameter to Consul Dtab Store
• Add file-system based name interpreter.
• Path identifier should only parse as many segments as requested
• Introduce the telemetry plugin subsystem to support arbitrary stats exporters and to eventually supplant the tracers subsystem.
• Add announcer support! linkerd can now announce to service discovery backends!
  • Add zk announcer.

0.7.3

• Allow protocol-specific parameters to be inherited on servers #561.
• Don't clear addr on k8s service deletion #567.
• Modify namerd's /delegate http endpoint to return bound names #569.
• Memoize status stats components #547.

0.7.2

• Add support for tags in the io.l5d.consul namer.
• Add an experimental io.l5d.consul storage backend for namerd.
• linkerd should use last known good data if it get errors from namerd.
• Fix exceptions when k8s namer encounters unexpected end of stream #551.
• Expose HTTP codec parameters as configuration options.
• Handle "too old" error when re-establishing Kubernetes watches.
• Improve Java compatibility for Namers plugins.

0.7.1

• Turn off HTTP decompression so that linkerd doesn't decompress and then recompress bodies.
• Various bug fixes in the dtab UI
• Optional dtab query parameter for selected Namerd HTTP Control API endpoints
• Fix an issue where streaming was unintentionally disabled
• Fix an issue with the io.l5d.serversets namer and residuals
• Add a consume option to the io.l5d.path identifier to strip off the path segments that it reads from the URI.
• Introduce a configurable Netty4 http implementation.

0.7.0

• New default JVM settings scale up with traffic levels.
  • JVM_HEAP is now deprecated, you can now separately set JVM_HEAP_MIN and JVM_HEAP_MAX but you shouldn't need to adjust them thanks to the new defaults.
• Overhaul HTTP headers:
  • l5d-ctx renamed to l5d-ctx-trace
  • l5d-ctx-deadline now propagates deadlines
  • l5d-ctx-dtab is now read, to replace dtab-local later.
  • l5d-dtab now honored as a replacement for dtab-local as specified by users.
  • l5d-dst-* no longer set on responses
• Fix graceful connection teardown on streaming HTTP responses #482.
• linkerd routers' timeoutMs configuration now applies on the server-side, so that the timeout acts as a global timeout rather than an individual request timeout.
• Binding cache size is now configurable in linkerd and namerd
• Use :: as the zk host delimiter in the zk leader namer
• Admin site/dashboard UI improvements:
  • The linkerd dtab UI now works correctly with the namerd interpreter
  • Added server success rate graphs to the dashboard, improved responsiveness
  • Added the ability to navigate to a specific router's dashboard
  • Standardized the look and feel of the admin pages

0.6.0

• Add zkLeader namer to allow discovery of services through ZooKeeper leader election.
• Add HTTP path request identifier, which builds destinations from a configurable number of HTTP URI path segments.
• Breaking Change! The path prefix /# now indicates that the path should be processed by a namer. A namer matches a path starting with /#/<prefix>.
• Breaking Change! Rename many plugin kind names.
• Breaking Change! Experimental plugins now require the experimental: true property to be set.
• Breaking Change! Change the format for ZooKeeper hosts in the ZK storage config.

0.5.0

• Add a debugTrace parameter to the tracers config section, which enables printing all traces to the console.
• Add etcd backed dtab storage.
• Introduce a default HTTP response classifier so that 5XX responses are marked as failures.
• Add a retries client config section supporting configurable retry budgets and backoffs.
• Automatically retry certain types of failures, as determined by response classifiers.
• Remove TLS support from the k8s namer in favor of using kubectl proxy for securely communicating with the k8s cluster API.
• Add an /admin/metrics/prometheus stats endpoint.

0.4.0

• Add a bindingTimeoutMs router parameter to configure the maximum amount of time to spend binding a path.
• Add experimental support for storing dtabs in Kubernetes via the ThirdPartyResource API (which must be enabled in your cluster).
• Breaking api change in namerd: dtabs are now string-encoded rather than thrift-encoded.
• Add /api/1/bind, /api/1/addr, and /api/1/delegate HTTP APIs to namerd
  • Most HTTP APIs now support ?watch=true for returning updates via a streaming response.
• Add ACL and authentication support to the ZooKeeper DtabStore.
• Support wildcards in dtabs!
• New linkerd dashboard is now enabled by default!! 📈

0.3.1

• Add beta version of linkerd dashboard version 2.0. Try it out at /dashboard on the linkerd admin site. 📈
• Support Zipkin tracer configuration via config file, to enable automatic export of tracing data from linkerd to a Zipkin collector.
• namerd's HTTP dtab API now supports the HEAD and DELETE methods
• Tear-down address observations in namerd if a service is deleted

0.3.0

• Added ✨ namerd ✨ : a service for managing linkerd (and finagle) name delegation.
• Breaking change to configs: httpUriInDst is now specified under the identifier header (see linkerd/docs/config.md for add'l info)
• Add a ttlMs marathon namer config option to configure the polling timeout against the marathon API.
• Add a enableProbation config option for configuring a client's load balancer probation setting

0.2.1

• Configs may now include a tracers section with pluggable tracers (although we don't provide any out of the box just yet)
• namers configurations may now configure Namers or NameInterpreters to support richer namer behavior.
• Add a loadBalancer section to the client config where a load balancer can be specified and configured. The load balancers that are currently supported are p2c, ewma, aperture, and heap.
• Add a config.json admin endpoint which re-serializes the parsed linkerd config.
• Add a maxConcurrentRequests config option to limit number of concurrent requests accepted by a server.
• Add a hostConnectionPool client config section to control the number of connections maintained to destination hosts.
• Add a attemptTTwitterUpgrade thrift client config option to control whether thrift protocol upgrade should be attempted.

0.2.0

• This release contains breaking changes to the configuration file format. linkerd config files are now a bit more explicit and less "magical", in the following ways:
  • Router configuration options can no longer be specified globally at the root level of the config file, but must be specified per-router.
  • All routers must now include a servers section; previously, a default server port would be used if none was provided.
• New thriftProtocol config option allows the thrift protocol to be specified. We currently support binary (default) and compact.
• Added traffic routing support for marathon apps with slashes in their ids.
• Resolved a browser-compatibility issue in the admin page for those not using the latest-and-greatest Chrome/Firefox/Safari.

0.1.0

• Introduce Marathon-backed service discovery, for routing traffic in Mesos.
• Add new boundPath client TLS module for per-service TLS authentication.
• Upgrade to Finagle 6.33, the latest and greatest in Finagle-based technology.

0.0.11

• TLS, for real this time.
• Configuration updates: config now includes a client section, where you can configure client-specific parameters.

0.0.10

• We now support end-to-end TLS! However, verification is currently limited to global certs. See linkerd#64 for more on the upcoming roadmap.
• Prep work for "transparent TLS". Look for this in upcoming releases.
• Prep work for being able to generate Docker images from the repo, in service of a glorious containerized future.
• Dashboard improvements! Now harder, faster, better, and also stronger!

0.0.9

• Include ZooKeeper ServerSet support, for real this time.

0.0.8

• Big new feature alert! We now have Zookeeper ServerSet support.
• Server-side TLS support! Stay tuned for more security features coming in future releases...
• Added CONTRIBUTING.md with Contributor License Agreement. We are ready to receive your honorable pull requests!
• New thriftMethodInDst config option to allow for routing based on thrift method names.
• Admin port now configurable via an admin/port config parameters, for those of you who have Opinions About Ports.
• DTab explorer admin page now supports inspecting DTabs for all configured routers.
• New /routers.json endpoint with runtime router state.
• We now have a slack channel! Operators are standing by to field YOUR questions today.
• Admin site redesign to match linkerd.io, now with favicon!

0.0.7

This is a big release! Get ready.

• Brand new name: 🌅 linkerd 🎈
• We're open source! This release is under Apache License v2.
• Tons of documentation on https://linkerd.io!
• This release adds config file support! You can express all your routing, listening, and protocol configuration needs in one convenient YAML file! See docs for how this works.

0.0.6

• Admin UI now features 25% more amazingness. 🌈
• Preliminary "pure" thrift support.
  • Default is framed transport with binary encoding; buffered transport also supported.
  • Out of the box, the router is configured to listen for thrift on port 4141 (i.e. in addition to HTTP on port 4140), and forwards thrift calls to localhost:9998. This will almost definitely change in the future.
• Tons of performance tuning. We're benchmarking sub-1ms p99 request latency and 40k+ qps throughput. Working on memory footprint reduction next.
• By popular demand, HTTP response code stats are now exported in metrics.json.
• Configurability still limited to what you can change in config.sh and disco/. Expect improvements here soon.

0.0.5

• Fancy Request Volume graph in the Admin page.
• Hide some internal interfaces from the Admin page.
• Modified interface labels to work in twitter-server's admin.

0.0.4

• Experimental Mux protocol support, for Advanced Users Only.
• New Admin UI that tries to not look like it was built by engineers.

0.0.3

• Using sophisticated shell script technology, we now ensure you have a sufficient Java version (we require JDK 8) before attempting to start the router.
• Upgrades to a newer version of the Finagle library.
• More information added to HTTP tracing:
  • Host header
  • Transfer-Encoding header
• New configuration options for HTTP routing
  • Routing by URI can be disabled, which simplifies many common use-cases
  • Allow internal and external http service prefixes to be specified on the command-line
• Fixed the "downstream clients" admin interface

0.0.2

• Router start/stop commands now detect if the router is currently running, easily preventing a whole class of easily-preventable errors.
• Tarball permissions are fixed.
• New support for Consul-backed service discovery, if files aren't good enough for ya.

0.0.1

First release of the Buoyant Application Router.

• Complete with router script to start/stop/restart the router!
• Router is pre-configured with sane defaults for running locally.
• Filesystem-backed service discovery mechanism.