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Qpid Proton 0.30.0 Release Notes

Proton is a high-performance, lightweight messaging library. More about Qpid Proton.

For more information about this release, including download links and documentation, see the release overview.

New features and improvements

  • PROTON-2030 - Use CLOCK_MONOTONIC in proactors for pn_transport_tick
  • PROTON-2096 - Drop Python 3 < 3.5
  • PROTON-2105 - Support Go modules
  • PROTON-2119 - [Python] Change API to better handle strings where symbols are required
  • PROTON-2124 - Disable GS2-KRB5 and GS2-IAKERB SASL mechanisms if they are not explicitly enabled
  • PROTON-2131 - Improved logging API
  • PROTON-2140 - proton-c has very high memory footprint for links
  • PROTON-2144 - [C] Memory usage tracking
  • PROTON-2146 - Reduce memory per connection
  • PROTON-2148 - Reduce size of shared object data segment
  • PROTON-2150 - Small reorganisation of object system to allow finer grained memory tracking
  • PROTON-2155 - Switch back to connect with args

Bugs fixed

  • PROTON-2091 - [python] example broker never removes empty queues
  • PROTON-2092 - [C++] When we use proton::connection::connect() [no arguments] allow no connect.json to get purely default settings
  • PROTON-2098 - [Python] client abruptly disconnects after receiving disconnect-close-half socket close sequence
  • PROTON-2099 - [Python] example test runner script leaks file handles
  • PROTON-2102 - [Python] Improve python build and packaging
  • PROTON-2103 - [Python] abstract_server example has incorrect import
  • PROTON-2109 - [Python] Correct default JSON schema to amqps
  • PROTON-2110 - [Python] Expand tilde symbol as user's home directory when searching for connect.json file
  • PROTON-2116 - Memory leak in python client
  • PROTON-2126 - Appveyor: pip install --user setuptools tox: exec code in run_globals File "C:\Python27\Scripts\", line 9, in <module> TypeError: 'module' object is not callable Command exited with code 1
  • PROTON-2127 - Proton doesn't build on FreeBSD currently
  • PROTON-2132 - proton-cpp fails to build with build on clang 9.0 when libc++ is used instead of libstdc++
  • PROTON-2137 - [cpp] Performance regression found in 0.29.0
  • PROTON-2138 - Capabilities not retrieved from transaction coordinator target
  • PROTON-2143 - Linkage warnings build proton-c/python bindings
  • PROTON-2145 - libqpid-proton-cpp-static.a not included in make install
  • PROTON-2149 - Handler incorrectly uses session state a method call
  • PROTON-2153 - Python Proton Reactor get_connection_address attempts to call non-existent connection.get_address method


  • PROTON-1801 - Strip the version from the /usr/share/proton dir