Don't reapply norms already applied in the same session #53
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This makes norm application faster by not repeatedly applying the same norms. This can be slow when there are many norms with a deep dependency tree. In order to implement this, the structure was changed significantly: - the reduction accumulator is no longer passed all the way down to `reduce-txes` - error-handling is now top-level
tobias
commented
May 18, 2023
Comment on lines
+239
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| acc (-> acc | ||
| (update :results concat (:results requires-results)) | ||
| (update :applied-norms into (:applied-norms requires-results)))] | ||
| (if (contains? (:applied-norms acc) norm-name) | ||
| acc | ||
| (try | ||
| (-> acc | ||
| (update :results concat | ||
| (if first-time-only | ||
| (handle-first-time-only-norm conn norm-attr norm-map norm-name | ||
| sync-schema-timeout tx-instant) | ||
| (handle-mutable-norm conn norm-attr norm-map norm-name | ||
| sync-schema-timeout tx-instant))) | ||
| (update :applied-norms conj norm-name)) |
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This is the heart of the change; we keep a set of norms we have processed in the current session, and skip processing for a norm if we see it again in the dependency tree.
It may be better to topologically sort the dependency tree and walk it once, but that would have been a bigger change.
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This makes norm application faster by not repeatedly applying the same
norms. This can be slow when there are many norms with a deep dependency
tree.
In order to implement this, the structure was changed significantly:
reduce-txesWe are currently using a fork of conformity at Shortcut that includes this change because we have a fairly complicated norm dependency tree. Before this change, a full conformity run against a fresh db would take 90 seconds. With this change, it now takes 1.8 seconds.
I'm offering it upstream in case it is useful for others.