[release/0.8] don't crash in cache refresh/update with nil fsnotify watcher.#255
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bart0sh merged 3 commits intocncf-tags:release/0.8from Feb 24, 2025
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Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>
Don't crash in update() if we fail to create an fsnotify watch. This can happen if we have too many open files. In this case we now record a failure for all configured spec directories and in update we always trigger a refresh. If the process if ever able to create new file descriptors the cache becomes functional but in a 'always implicitly fully refreshed' mode instead of auto- refreshed. It's not entirely clear what is the best option to deal with a failed watch creation. Being out of file descriptors typically results in a cascading chain of errors which the process does not usually survive. This fix aims for minimal footprint. On failed watch creation it does not render the cache fully unusable. If the process is ever able to create new file descriptors again the cache also becomes functional, but instead of autorefreshed mode it will be in an 'always implicitly fully refreshed' mode. Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>
Test that the cache indeed recovers functionally if the process ever recovers from not being able to create new file descriptors. Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>
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Cherry picked #254 to release/0.8 branch.