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Irrespective of the type of dataset (append or append + update) in use, index look up plays a very critical role in the both read and write performance. If we can solve record level indexing mapped to FileId and may be partition (depending on the use-case) without adding too much to latency, it will be a good improvement to Hudi's performance. make Hudi more performant.

So this RFC aims at providing a record level indexing capability to Hoodie for faster lookups. 

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