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Posted to dev@drill.apache.org by GitBox <gi...@apache.org> on 2022/11/02 13:53:31 UTC

[GitHub] [drill] jnturton commented on pull request #2697: DRILL-8299: HashMap key type mismatch in MetadataContext

jnturton commented on PR #2697:
URL: https://github.com/apache/drill/pull/2697#issuecomment-1300446343

   > @jnturton Thanks for submitting this. I approved this but what were the implications of this bug?
   
   @cgivre the bug had a performance implication. A cache recording which directories already had their modification times checked for the purpose of determining where Parquet metadata cache files (created by `REFRESH TABLE METADATA`) need updating was being accessed using objects of wrong type that, barring an unexpected override of Path.equals(), meant that the cache had a 100% miss rate.


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