S2PX requires a solution which supports the same capabilities as Server hashed files:
A single hashed files file can act as both a source and target within the same job.
A single hashed file can be referenced by multiple source and target stages within the same job.
A hashed file stage can use keys values to enable the upsert of its data.
Hashed files provide database record locking so that a single job or multiple jobs can read from and write to the same hashed file concurrently.
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