Ra v2.16.0

[kjnilsson]

This version of Ra contains a substantially refactored Ra log implementation that provides higher throughput and lower memory use in several scenarios.

Changes:

• QQ: Use new log_ext effect

  This offloads the work of reading messages from on-disk segments
  to the interacting process (typically a session or channel process)
  rather than doing this blocking, performance affecting work in the
  Ra server process.

• Ensure opened segments are closed after some time of inactivity

  Processes that have received messages that had to be read from disks
  may keep a segment open indefinitely. This introduces a timer which
  after some time of inactivity will close all opened segments to ensure
  file descriptors are not kept open indefinitely.

• Use initial_machine_version config to avoid initialising from rabbit_fifo version 0.

• Use initial_machine_version config to avoid initialising from rabbit_stream_coordinator version 0.

• Avoid dead lock in queue federation.

  When processing the queue federation startup even the process
  may call back into the Ra process causing a deadlock. in this
  case we spawn a temporary process to avoid this.

[michaelklishin]

FTR, the reason why bazel run gazelle did not update the file in question is likely as simple as: it does not mess with any dependency build files, only the "proper RabbitMQ source files", by design.