Abstract: According to at least one embodiment, a method, a computer system, and a computer program product for handling an unreliable data sink is provided. The present invention may include reading, continuously, via a stream processor, a batch of data entering the stream processor via a reliable input stream, the stream processor comprising a daisy chain of sink nodes, wherein a first sink node is a primary sink node and a subsequent plurality of sink nodes in the daisy chain are fallback sink nodes; outputting processed data to a non-streaming target system; upon completion of the processed data to the non-streaming target system, invoking an asynchronous callback function listing successful and failed record IDs of the processed data; and passing the failed records to a first fallback sink within the daisy chain, while the primary sink node concurrently continues submitting new batches of data to the non-streaming target system.