Linkerd 1.4.5

[Alex Leong]

Dear Linkerd community,

I'm happy to announce the release of Linkerd 1.4.5! https://github.com/linkerd/linkerd/releases/tag/1.4.5

Linkerd 1.4.5 contains some minor bugfixes and introduces two much-requested features. First, it is now possible to selectively disable Linkerd's admin endpoints, e.g., keep the UI functional but to disable the shutdown endpoint. A huge thanks to Robert Panzer for all his hard work on this.

Second, we've added experimental support for the OpenJ9 JVM.  Preliminary tests with OpenJ9 exhibit a 3x reduction in startup time, a 40% reduction in memory footprint, and a 3x reduction in p99 latency. You can find a Linkerd+OpenJ9 Docker image at buoyantio/linkerd:1.4.5-openj9-experimental on Docker Hub.

Full release notes:

• Add an OpenJ9 configuration for building a Docker image with the OpenJ9 JVM
• Fix a NullPointerException when using the -validate flag
• Fix an error where diagnostic tracing did not work when receiving a chunk encoded response
• Admin
  • Add a security section to the admin config that controls which admin endpoints are enabled
• HTTP/2
  • Fix a memory leak when there are a large number of reset streams
  • Allow HTTP/2 response classifiers to be loaded as plugins
• Namerd
  • Fix a memory leak in the the io.l5d.mesh interpreter when idle services are reaped