THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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def~Merge-On-Read
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Hudi writing is implemented as a Spark library, which makes it easy to integrate into existing data pipelines or ingestion libraries (which we will refer to as `Hudi clients`). Hudi Clients prepare an `RDD[HoodieRecord]` that contains the data to be upserted and Hudi upsert/insert is merely a Spark DAG, that can be broken into two big pieces.
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