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utils/log: add early record buffering

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Buffer early log records until a log file becomes available, flush
records to said file afterwards. This ensures that early log output,
which, among other things, contains plugin discovery logging, is not
lost. Buffer capacity is configurable via an environment variable.
This commit is contained in:
sergei Trofimov
2018-04-30 11:30:45 +01:00
committed by Marc Bonnici
parent 8d330924dc
commit 1e750c659b
2 changed files with 55 additions and 2 deletions
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10
doc/source/user_reference/configuration.rst
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@@ -50,5 +50,15 @@ various assets when it starts.
.. note:: This location **must** be writable by the user who runs WA.
.. confval:: WA_LOG_BUFFER_CAPACITY
Specifies the capacity (in log records) for the early log handler which is
used to buffer log records until a log file becomes available. If the is not
set, the default value of ``1000`` will be used. This should sufficient for
most scenarios, however this may need to be increased, e.g. if plugin loader
scans a very large number of locations; this may also be set to a lower
value to reduce WA's memory footprint on memory-constrained hosts.
.. include:: user_reference/runtime_parameters.rst