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Kami merged 3 commits into from
Oct 30, 2019
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Add changelog entry for changes StackStorm/st2@4803 #941

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Add changelog entry for changes in
Kami Oct 29, 2019
a225722
Fix typo.
Kami Oct 29, 2019
c0a2586
Fix typo.
Kami Oct 30, 2019
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22 changes: 22 additions & 0 deletions docs/source/upgrade_notes.rst
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Expand Up @@ -3,6 +3,28 @@
Upgrade Notes
=============

.. _ref-upgrade-notes-v3-2:

|st2| v3.2
----------

* We have switched from unbuffered to fully buffered output for Python runner actions. This should
result in better performance and smaller CPU utilization for actions which produce a lot of
output.

If you experience issues with some Python runner actions hanging out the real time action output
is slower / less real-time than before, you can set ``actionrunner.stream_output_buffer_size``
config option to ``-1`` and restart st2actionrunner processes (``sudo st2ctl restart-component
st2actionrunner``).

This will switch back to the unbuffered output.

This config directly controls ``bufsize`` argument which is passed to
``st2common.util.green.shell.run_command()`` function so you can also
experiment with other values which are supported by Python
``subprocess.Popen`` (https://docs.python.org/2/library/subprocess.html#popen-constructor)
function.

.. _ref-upgrade-notes-v3-0:

|st2| v3.0
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