[GitHub] [iceberg] liupan664021 edited a comment on issue #3741: [Improvement] ParallelIterable#hasNext submit reading ManifestFile task slowly with DataTableScan#planTasks

[GitBox <gi...@apache.org>]

liupan664021 edited a comment on issue #3741:
URL: https://github.com/apache/iceberg/issues/3741#issuecomment-994431903


   I met the same problem with you when using iceberg connector in presto. The `ManifestFiles.read()` is executed serially which can significantly slow down the file plan if manifest file is masssive. And I made similar fix as you but I haven't test the performance improvement yet. I think delaying the `ManifestFiles.read()` to parallel threads is more reasonable.


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