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Optimize cases with long potential simple_keys#555
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niemeyer merged 3 commits intogo-yaml:v2from Jan 21, 2020
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liggitt
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Thanks for keeping it up.
Here are some initial comments on the issue:
efficient lookup in yaml_parser_fetch_value().
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Thanks again for the first pass. Are you up for considering the addition of the single_key index? I'd like to have something to include in the next set of Kubernetes patch releases around the first week of January. |
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Message from original commit (53403b5): This change introduces an index to lookup token numbers referenced by simple_keys in O(1), thus significantly reducing the performance impact of certain abusively constructed snippets. When we build up the simple_keys stack, we count on the (formerly named) staleness check to catch errors where a simple key is required but would be > 1024 chars or span lines. The previous simplification that searches the stack from the top can go 1024 keys deep before finding a "stale" key and stopping. I added a test that shows that this consumes ~3s per 1MB of document size.
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Update gopkg.in/yaml.v2 |
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When we build up the simple_keys stack, we count on the (formerly named) staleness check to catch errors where a simple key is required but would be > 1024 chars or span lines. The previous simplification that searches the stack from the top can go 1024 keys deep before finding a "stale" key and stopping. I added a test that shows that this consumes ~3s per 1MB of document size.
I split that staleness check back out into a separate loop so that we don't unnecessarily re-process a bunch of keys just to get down to the ones that might have gone stale.