[PR #11100/947247fd backport][3.12] Fix spurious "Future exception was never retrieved" warnings for connection lost errors #11101
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bdraco
approved these changes
May 31, 2025
Codecov ReportAll modified and coverable lines are covered by tests ✅
✅ All tests successful. No failed tests found. Additional details and impacted files@@ Coverage Diff @@
## 3.12 #11101 +/- ##
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Coverage 98.24% 98.25%
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Files 130 130
Lines 41765 41777 +12
Branches 2294 2294
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+ Hits 41034 41046 +12
Misses 557 557
Partials 174 174
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CodSpeed Performance ReportMerging #11101 will not alter performanceComparing Summary
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bdraco
deleted the
patchback/backports/3.12/947247fd4aa2954a746c3a8c183bb7acceb8c3cd/pr-11100
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This is a backport of PR #11100 as merged into master (947247f).
What do these changes do?
This PR fixes spurious "Future exception was never retrieved" warnings that occur when connections are lost (e.g., SSL shutdown timeouts, network errors) and the connector is not immediately closed.
The fix marks the exception on the
ResponseHandler.closedfuture as retrieved after setting it, since the exception is always propagated through other means (via the waiter). This prevents Python from logging unnecessary warnings about unretrieved exceptions.Are there changes in behavior for the user?
No functional changes. Users will no longer see spurious "Future exception was never retrieved" warnings in their logs when connections are lost.
Related issue number
This issue was introduced by #3733 (backported as #11074), which added proper connection closure waiting but exposed these futures that may not be awaited until the connector is closed.