bvaradar commented on issue #715: [Bug]Hudi 0.4.7 HoodieTable not found URL: https://github.com/apache/incubator-hudi/issues/715#issuecomment-499350032 @garyli1019 : Yes, Hudi will generate a new version first and then cleaner will delete old version. If the reader doesn't recognize Hudi format (if using Parquet format directly), then there is no snapshot isolation guarantee to reader. Hudi writer will first create new version of parquet files in place before committing and running cleaner. When you run a query around this time treating the dataset as raw parquet one, then the query could see partially written parquet files or duplicate data. Hudi's reader side integration (HoodieInputFormat/ Hudi-DataSource (for Spark)) ensures snapshot isolation.
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