gortiz commented on PR #15609:
URL: https://github.com/apache/pinot/pull/15609#issuecomment-2850946220

   I've applied some last minute changes, including a new option to configure 
whether opchains should be kept or not when they finish successfully. By 
default, we will not keep them. This keeps the cache as small as possible, but 
the side effect is that we may lose important information when part of the 
query finishes successfully early and then another part fails.
   
   When `pinot.server.query.op.stats.cache.invalidate.on.success` is false, 
these successfully ended opchains will be kept in the cache. The effect is that 
the cache will rotate more often. In high QPS environments, this may mean that 
queries that fail may be unable to find their stats.
   
   In future we can introduce a query option to disable successful invalidation 
on query bases, which could be useful when users write new queries.


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