Exmld.KinesisStage.disposition

You're seeing just the function disposition, go back to Exmld.KinesisStage module for more information.
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disposition(stage, disposition, timeout \\ :infinity)

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Notify stage of the disposition of processing some items.

An attempt has been made to process some data extracted from a Kinesis record by a downstream processor. stage will look up the originating producer and record the disposition of processing in the next batch of data to be returned to that producer.