adriangb commented on PR #18014: URL: https://github.com/apache/datafusion/pull/18014#issuecomment-3410593758
> I have a question: are we assuming that it's not possible to make RepartitionExec memory-constant (i.e., O(n_partitions * batch_size) memory)? Is this due to an engineering limitation, or is it theoretically impossible? > > If we can make `RepartitionExec` only use constant memory, is this spilling `RepartiitonExec` still needed for `datafusion-distributed` usage? I think it's theoretically impossible. If one partition is faster than another the data flowing into the slow partition has to accumulate somewhere. I consider the possibility of making the channels bounded, but I'm afraid that would result in deadlocks. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
