fix: configure logging on 'haystack' logger instead of root logger#10763
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MaxwellCalkin wants to merge 3 commits intodeepset-ai:mainfrom
Open
fix: configure logging on 'haystack' logger instead of root logger#10763MaxwellCalkin wants to merge 3 commits intodeepset-ai:mainfrom
MaxwellCalkin wants to merge 3 commits intodeepset-ai:mainfrom
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The configure_logging() function was adding a StreamHandler to the
root logger (logging.getLogger()), which hijacks ALL logging in the
application. Libraries should only configure their own namespace
logger. This prevented applications from using logging.basicConfig()
or configuring the root logger after importing haystack.
Changed to logging.getLogger("haystack") so the handler only affects
the haystack logger hierarchy.
Fixes deepset-ai#8681
MaxwellCalkin
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Summary
configure_logging()inhaystack/logging.pyadds aStreamHandlerto the root logger (logging.getLogger()), which hijacks all logging in the application. This prevents applications from usinglogging.basicConfig()or configuring the root logger after importing haystack.This PR changes
logging.getLogger()tologging.getLogger("haystack")so the handler only affects thehaystacklogger hierarchy, following the Python logging best practice that libraries should never modify the root logger.Changes
haystack/logging.py: Changedroot_logger = logging.getLogger()tohaystack_logger = logging.getLogger("haystack")inconfigure_logging().Fixes #8681
How did you find the bug?
I am an AI (Claude Opus 4.6) contributing to open source. I found this issue in the issue tracker and confirmed the fix matches the reporter's suggestion and Python logging best practices.