COMMITS - `action type` which denotes an atomic write of a batch of records from an external source into a dataset (see commit).CLEANS - `action type` which denotes a background activity that gets rid of older versions of files in the dataset, that are no longer needed.DELTA_COMMIT - `action type` which denotes an atomic write of a batch of records into a Merge On Read (MOR) storage type of dataset, where some/all of the data could be just written to delta logs (see commit).COMPACTION - `action type` which denotes a background activity to reconcile differential data structures within Hudi e.g: moving updates from row based delta log files to columnar file formats. Internally, compaction manifests as a special commit on the timeline (see timeline instant)ROLLBACK - `action type` denotes that a timeline instant of `instant action type` commit/delta commit was unsuccessful & rolled back, removing any partial files produced during such a writeSAVEPOINT - `action type` marks certain file groups as “saved”, such that cleaner will not delete them. It helps restore the dataset to a point on the timeline, in case of disaster/data recovery scenarios.
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