Optimize CacheKey handling in SpringIterableConfigurationPropertySource #16717
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spring-projects-issues
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As an addendum. This brings us pretty close to the performance of 1.5 for such big files.
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Test failure seems unrelated |
philwebb
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Thanks @dreis2211, sorry about the delay getting to these. I hope to review soon. |
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Don't worry. There's release preparation, the new annotations API and it's conference season etc.. Whenever you're ready :) |
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This is great!!! I've updated things a little in this commit so that sources actually need to declare themselves as immutable. We can then use a shared cache key that always matches. This should save us from even creating the |
philwebb
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Jun 4, 2019
Update `SpringIterableConfigurationPropertySource` so that cache keys do not need to be checked if property sources are immutable. See gh-16717
philwebb
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Jun 4, 2019
Make immutable properties more explicit and trust that they truly won't change. See gh-16717
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Hi,
as described in #16401 there is an optimization opportunity in
SpringIterableConfigurationPropertySourcewhen checking for CacheKey equality. Currently, for large Sets this takes a considerable amount of time as the two Sets are usually equal, but not the same instance. This is due to the fact that the internal key inside CacheKey is copied in order to fix #13344 and can thus not benefit from a==comparison.The idea of this PR is to introduce a flag that effectively disables the copying of the internal key under certain circumstances. Imho, this could be done for
OriginTrackedMapPropertySourceinstances which is used to load either.yamlor.propertiesfiles, which usually shouldn't be a subject of change (and even if require a refresh of some sort). I still implemented an additional check for the size of the internal key in a best effort to track key additions at least forOriginTrackedMapPropertySources, too.With the applied changes, I see major improvements compared to a M2 baseline.
Let me know what you think.
Cheers,
Christoph