Rollup with null key for multifiles

I have a 4way mfs. I connected to rollup, i have mentioned key as null. How many records will come to output?

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Neha Goyal

  • Aug 22nd, 2018

4 records will come in output. One for each partition

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Abinitio Beginner

  • Aug 28th, 2018

Only 1 record will go in output.

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Amaan Sajid Ansari

  • Nov 14th, 2018

You have to understand how roll-up works, it makes group of records based on the key, If the key is null it considers all the record in a partition as one so it will throw 1 record per number of partition. In your case Its 4

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  • May 26th, 2021

4 records, 1 per partition as rollup with be working in a component parallelism. So in the background there will be 4 processes each for a partition on which the component works.Hence 4.The question no where mentions there is a fan in happening anywhere.

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