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# Retry Failed Documents

Some IDOL NiFi Ingest Connectors support a feature called synchronize from identifiers. If a connector supports this feature, you can route documents that were not processed successfully back to the connector, so that the connector retrieves each of the failed documents again.

When you route a FlowFile back to a connector, the connector reads its identifier (a unique value that is assigned by the connector). The connector uses the identifier to retrieve the source data from the repository again. If the source data is retrieved successfully the connector discards the FlowFile that it received and outputs a new FlowFile to the success relationship. If the source data is not retrieved successfully the connector outputs the FlowFile it received to the failed identifiers relationship.

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