# Synchronize

The `Synchronize` action instructs the connector to synchronize with the data repository immediately. (Usually you would schedule synchronize cycles to occur on a regular basis, according to a schedule).

The connector searches the repository for new, updated, and deleted documents. FlowFiles containing the information are routed to the "Synchronize Output" relationship of the connector group.

You can also synchronize specific documents by providing a list of document identifiers.

Type: asynchronous

Parameter | Description | Required
--- | --- | ---
`ConnectorGroup` | The name of the connector group to send the request to. This must match the name you specified when you configured the ConnectorGroupRouter processor in your dataflow. | Yes
`Documents` | XML that specifies the documents to synchronize. When you set this parameter, the documents are ingested (FlowFiles are routed to the "Synchronize Output" relationship) whether the documents have changed or not.
    <documents custom_attribute1="...">
        <document custom_attribute2="...">
            <CONNECTOR_GROUP>FileSystem</CONNECTOR_GROUP>
            <AUTN_IDENTIFIER>BASE64</AUTN_IDENTIFIER>
        </document>
        ...
    </documents>
The `CONNECTOR_GROUP` element specifies the name of the connector group to send the request to. This overrides the value of the `ConnectorGroup` action parameter for a specific document. If you specify the connector group for every document, you no longer need to set the action parameter. If present in the XML, the `CONNECTOR_GROUP` element must be the first element within the `document` element. The `AUTN_IDENTIFIER` element specifies an IDOL document identifier. In NiFi Ingest, actions are represented by FlowFiles. You can specify custom attributes on the `documents` element (for all documents) or on a `document` element (for a single document). These are added to FlowFiles that represent actions, as FlowFile attributes. The FlowFile attributes are named `idol.doc.name`, for example `idol.doc.custom_attribute1`. | No
`Identifiers` | A comma-separated list of identifiers for documents that you want to synchronize. Specify a list of identifiers to synchronize only those documents. When you set this parameter, the documents are ingested (FlowFiles are routed to the "Synchronize Output" relationship) whether the documents have changed or not. | No
Custom parameters | Any other parameters that you set are added to the FlowFile, created by the HandleAciRequest processor, that represents the action. When a connector processes the action, it adds the parameters to any FlowFiles that it generates. The parameters are added as FlowFile attributes named `idol.aci.param.name`, where `name` is the name of the parameter that you set. FlowFile attributes can be referenced by processor properties that support expression language, and can be read by Lua scripts. You can therefore set custom parameters to customize processing within NiFi. The maximum size for a custom parameter value is 4KB. | No

## Example

    http://host:10000/action=Synchronize&ConnectorGroup=FileSystem

## Response

This is an asynchronous action, so you receive a token in response to the request. The following XML shows an example response to the QueueInfo action.

    <autnresponse>
        <action>QUEUEINFO</action>
        <response>SUCCESS</response>
        <responsedata>
            <actions>
                <action>
                    <status>Finished</status>
                    <queued_time>2019-Sep-12 15:42:36</queued_time>
                    <time_in_queue>0</time_in_queue>
                    <process_start_time>2019-Sep-12 15:42:36</process_start_time>
                    <time_processing>1</time_processing>
                    <process_end_time>2019-Sep-12 15:42:38</process_end_time>
                    <token>...</token>
                </action>
            </actions>
        </responsedata>
    </autnresponse>

If you set the `documents` action parameter, the response should also contain a `<success>` element for each of the specified documents, containing the document identifier.

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