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How to export and import nifi flow from one HDP to another HDP


How to export and import nifi flow from one HDP to another HDP

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How to export and import nifi flow from one HDP to another HDP
Tag : development , By : Aki Björklund
Date : November 26 2020, 03:01 PM

With these it helps NiFi can export/import flows via templates. You can save your flow as a template (xml file), and import the template from a file as well. Follow this link
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Nifi PutMongo - How to insert document into MongoDB using attribute values of Flow File but not Flow File content?


Tag : mongodb , By : eastcoastj
Date : March 29 2020, 07:55 AM
I wish this help you You can use a processor like AttributesToJson, or ReplaceText, to overwrite the flow file content with the attributes that you want to use for the Mongo document.

Tag : flutter , By : Janne Laine
Date : March 29 2020, 07:55 AM
With these it helps This is a possible way to keep data in-memory and write to disk when changes are made to your datamodel/settings.
I use RxDart myself. You don't need it per se, although it does make life easier. I'll be simplifying the examples below, so you get to know the concept and apply it to your own needs.
@JsonSerializable()
class Settings {
    String someData1;
    String someData2;

    // json seriazable functions
}
class SettingsHandler {
    Settings _settings;
    StreamController<Settings> _settingsController = BehaviorSubject<Settings>();

    StreamController<String> _data1Controller = BehaviorSubject<String>();
    StreamSink<String> get data1Input => _data1Controller.sink;
    Observable<String> get data1Output => Observable(_data1Controller.stream);

    Future<Settings> _readFromDisk() async {
        // do your thing
    }

    Future<Settings> _writeToDisk(Settings settings) async {
        // do your thing
    }

    Future<void> init() async {
        // read from disk
        _settings = await _readFromDisk();
        _settingsController.sink.add(_settings);

        // initialize data
        data1Input.add(_settings.someData1);
        data1Output
            .skip(1) // we skip because we just added our initialization data above.
            .listen((value) =>
                // we must propagate through the update function
                // otherwise nothing gets written to disk
                update((settings) => settings.someData1 = value)
            );

        // when changes are made, it needs to notify this stream
        // so everything can be written to disk
        _settingsSaver.output
            // save settings every 2.5 seconds when changes occur.
            .debounceTime(const Duration(milliseconds: 2500))
            // get the changes and write to disk
            .listen((settings) => _writeToDisk(settings));
    }

    // this function is crucial as it allows changes to be made via the [adjustFunc]
    // and then propagates this into the _settingsSaver stream.
    void update(void Function(Settings input) adjustFunc) {
        adjustFunc(_settings);
        _settingsSaver.sink.add(_settings);
    }
}
var handler = SettingsHandler();
await handler.init();

// this
handler.data1Input.add('NewData');

// or this
handler.update((settings) {
    settings.someData1 = 'NewData';
});

NiFi: Failed to connect node to cluster because local flow is different than cluster flow


Tag : development , By : MikeW
Date : March 29 2020, 07:55 AM
will help you This means there is a difference in authorizations.xml or users.xml, most likely authorizations.xml. I would try copying those two files from one of the other nodes over to the node that is having the problem, this will ensure they are exactly the same.

Is it possible to export/import Flow types in Node?


Tag : development , By : tlync
Date : March 29 2020, 07:55 AM
this will help You can still use import type ... and export type ... in CommonJS files. They are already custom things added for Flow, they just resemble ES6 module syntax. Since they are all erased by the time the code actually runs, there is no problem.

NiFi How to query Content Repository from NiFi Flow


Tag : hadoop , By : Mare Astra
Date : March 29 2020, 07:55 AM
will be helpful for those in need You are mistaken, the content of the flow files is saved into the Content Repository. You don't need to query the Content Repository to use those FlowFiles.. I assume that you are using PutHiveQL, so just use the success relationship for your next flow.
Example: ExecuteSQL ->(success) Transform Process Group ->(output) PutHiveQL ->(success) -> Next Flow
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