Fix setTag logic to prevent high cpu load on rds #572
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stevie9868
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…d of loading from memory + test
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| def "test includeValues"() { |
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Can you add some additional tests featuring duplicates and multiple call iterations
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Sorry, could you elaborate more?
I think I have covered them also in the functional test.
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ok looks like the functional test can cover the iterations part, could you add another unit test featuring if a caller tries to add duplicate tag in one call like pass in the same tag multiple times in the input list
| "delete from lookup_values where lookup_id=? and values_string in (%s)"; | ||
| private static final String SQL_INSERT_LOOKUP_VALUE_IF_NOT_EXIST = | ||
| "INSERT INTO lookup_values(lookup_id, values_string) VALUES (?,?) " | ||
| + "ON DUPLICATE KEY UPDATE lookup_id=lookup_id, values_string=values_string"; |
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This is functionally correct though for high usage tags it might lead to continuously doing useless updates, just checking do you have any way to do this with IGNORE instead.
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| def "test includeValues"() { |
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ok looks like the functional test can cover the iterations part, could you add another unit test featuring if a caller tries to add duplicate tag in one call like pass in the same tag multiple times in the input list
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| if (!inserts.isEmpty()) { | ||
| insertLookupValues(lookup.getId(), inserts); | ||
| if (includeValues) { |
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the previous code didn't even add back the new tags to the return result, but based on usage it does not make a difference either way
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yep, you are right but I want to make it consistent.
For now, whenever we want to set a tag on a resource, it will always fetch all tags from the dbs into memory, and then do a diff to figure out what tags never exist in the db. Loading all tags at once creates a lot of load on the rds if the number of tags is huge when number of setTag request is high.
For this PR, I also remove some unused code.
Instead of fetching all tags into memory, we will instead do
Even though, there is no unit test for tag component, there are lots of existing tests in the functional test, and I also add one more functional test to cover more scenarios.
Since the logic I change should have no impact on the core logic, we should expect the functionalTest to have the same result before and after this change.
Finally, in order to make this insert query fast, we will need to build a composite index on (lookup_id, values_string)