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[3.12] gh-105623 Fix performance degradation in logging RotatingFileHandler (GH-105887) #121116

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Merged
merged 1 commit into from
Jun 28, 2024
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[3.12] gh-105623 Fix performance degradation in logging RotatingFileHandler (GH-105887) #121116

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6 changes: 3 additions & 3 deletions Lib/logging/handlers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -187,15 +187,15 @@ def shouldRollover(self, record):
Basically, see if the supplied record would cause the file to exceed
the size limit we have.
"""
# See bpo-45401: Never rollover anything other than regular files
if os.path.exists(self.baseFilename) and not os.path.isfile(self.baseFilename):
return False
if self.stream is None: # delay was set...
self.stream = self._open()
if self.maxBytes > 0: # are we rolling over?
msg = "%s\n" % self.format(record)
self.stream.seek(0, 2) #due to non-posix-compliant Windows feature
if self.stream.tell() + len(msg) >= self.maxBytes:
# See bpo-45401: Never rollover anything other than regular files
if os.path.exists(self.baseFilename) and not os.path.isfile(self.baseFilename):
return False
return True
return False

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2023-06-17-09-07-06.gh-issue-105623.5G06od.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix performance degradation in
:class:`logging.handlers.RotatingFileHandler`. Patch by Craig Robson.