Community Articles

lwang · ‎11-18-2019

Exploring Apache NiFi 1.10: Parameters and Stateless Engine

Apache NiFi is now available in 1.10!

https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12316020&version=12344993

You can now use JDK 8 or JDK 11! I am running in JDK 11, seems a bit faster.

A huge feature is the addition of Parameters! And you can use these to pass parameters to Apache NiFi Stateless!

A few lesser Processors have been moved from the main download, see here for migration hints:

https://cwiki.apache.org/confluence/display/NIFI/Migration+Guidance

Release Notes: https://cwiki.apache.org/confluence/display/NIFI/Release+Notes#ReleaseNotes-Version1.10.0

Example Source Code: https://github.com/tspannhw/stateless-examples

More New Features:

ParquetReader/Writer (See: https://www.datainmotion.dev/2019/10/migrating-apache-flume-flows-to-apache_7.html)
Prometheus Reporting Task. Expect more Prometheus stuff coming.
Experimental Encrypted content repository. People asked me for this one before.
Parameters!! Time to replace Variables/Variable Registry. Parameters are better in every way.
Toolkit module to generate and build Swagger API library for NiFi
PostSlack processor
PublishKafka Partition Support
GeoEnrichIPRecord Processor
Remote Input Port in a Process Group
Command Line Diagnostics
RocksDB FlowFile Repository
PutBigQueryStreaming Processor
nifi.analytics.predict.enabled - Turn on Back Pressure Prediction
More Lookup Services for ETL/ELT: DatabaseRecordLookupService
KuduLookupService
HBase_2_ListLookupService

Stateless

First we will run in the command line straight from the NiFi Registry. This is easiest. Then we will run from YARN! Yes you can now run your Apache NiFi flows on your giant Cloudera CDH/HDP/CDP YARN clusters! Let's make use of your hundreds of Hadoop nodes.

Stateless Examples

Let's Build A Stateless Flow

The first thing to keep in mind, is we will want anything that might change to be a parameter that we can pass with our JSON file. It's very easy to set parameters even for drop downs! You even get prompted to pick a parameter from a selection list. Before parameters are available you will need to add them to a parameter list and assign that parameter context to your Process Group.

A Parameter in a Processor Configuration is shown as #{broker}

Parameter Context Connected to a Process Group, Controller Service, ...

Apply those parameters

Param(eter) is now an option for properties

Pop-up Hint for Using Parameters

Edit a Parameter in a Parameter Context

We can configure parameters in Controller Services as well.

So easy to choose an existing one.

Use them for anything that can change or is a something you don't want to hardcode.

Apache Kafka Consumer to Sink

This is a simple two step Apache NiFi flow the reads from Kafka and sends to a sink, for example a File.

Let's make sure we use that Parameter Context

To Build Your JSON Configuration File you will need the bucket ID and flow ID from your Apache NiFi Registry. You will also need the URL for that registry. You can browse that registry at a URL similar to http://tspann-xx-xx:18080.

My Command Line Runner

/Users/tspann/Documents/nifi-1.10.0-SNAPSHOT/bin/nifi.sh stateless RunFromRegistry Continuous --file /Users/tspann/Documents/nifi-1.10.0-SNAPSHOT/logs/kafkaconsumer.json

RunFromRegistry [Once|Continuous] --file <File Name>

This is the basic use case of running from the command-line using a file. The flow must exist in the reference Apache NiFi Registry.

JSON Configuration File (kafkaconsumer.json)

{

"registryUrl": "http://tspann-xx-xx:18080",

"bucketId": "140b30f0-5a47-4747-9021-19d4fde7f993",

"flowId": "0540e1fd-c7ca-46fb-9296-e37632021945",

"ssl": {

"keystoreFile": "",

"keystorePass": "",

"keyPass": "",

"keystoreType": "",

"truststoreFile": "/Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home/lib/security/cacerts",

"truststorePass": "changeit",

"truststoreType": "JKS"

},

"parameters": {

"broker" : "x.x.x.x:9092",

"topic" : "iot",

"group_id" : "nifi-stateless-kafka-consumer",

"DestinationDirectory" : "/tmp/nifistateless/output2/",

"output_dir": "/Users/tspann/Documents/nifi-1.10.0-SNAPSHOT/logs/output"

}

Example Run

12:25:38.725 [main] DEBUG org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_2_0 - ConsumeKafka_2_0[id=e405df7f-87ca-305a-95a9-d25e3c5dbb56] Running ConsumeKafka_2_0.onTrigger with 0 FlowFiles

12:25:38.728 [main] DEBUG org.apache.kafka.clients.FetchSessionHandler - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Node 8 sent an incremental fetch response for session 1943199939 with 0 response partition(s), 10 implied partition(s)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-8 at offset 15 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-9 at offset 16 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-6 at offset 17 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-7 at offset 17 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-4 at offset 18 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-5 at offset 16 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-2 at offset 17 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-3 at offset 19 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-0 at offset 16 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Added READ_UNCOMMITTED fetch request for partition iot-1 at offset 20 to node ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.728 [main] DEBUG org.apache.kafka.clients.FetchSessionHandler - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Built incremental fetch (sessionId=1943199939, epoch=5) for node 8. Added 0 partition(s), altered 0 partition(s), removed 0 partition(s) out of 10 partition(s)

12:25:38.729 [main] DEBUG org.apache.kafka.clients.consumer.internals.Fetcher - [Consumer clientId=consumer-1, groupId=nifi-stateless-kafka-consumer] Sending READ_UNCOMMITTED IncrementalFetchRequest(toSend=(), toForget=(), implied=(iot-8, iot-9, iot-6, iot-7, iot-4, iot-5, iot-2, iot-3, iot-0, iot-1)) to broker ip-10-0-1-244.ec2.internal:9092 (id: 8 rack: null)

12:25:38.737 [main] DEBUG org.apache.nifi.processors.kafka.pubsub.ConsumeKafka_2_0 - ConsumeKafka_2_0[id=e405df7f-87ca-305a-95a9-d25e3c5dbb56] Running ConsumeKafka_2_0.onTrigger with 0 FlowFiles

Example Output

cat output/247361879273711.statelessFlowFile

{"id":"20191105113853_350b493f-9308-4eb2-b71f-6bcdbaf5d6c1_Timer-Driven Process Thread-13","te":"0.5343","diskusage":"0.2647115097153814.3 MB","memory":57,"cpu":132.87,"host":"192.168.1.249/tspann-xx-xx","temperature":"72","macaddress":"dd73eadf-1ac1-4f76-aecb-14be86ce46ce","end":"48400221819907","systemtime":"11/05/2019 11:38:53"}

We can also run Once in this example to send one Kafka message.

Generator to Apache Kafka Producer

My Command Line Runner

/Users/tspann/Documents/nifi-1.10.0-SNAPSHOT/bin/nifi.sh stateless RunFromRegistry Once --file /Users/tspann/Documents/nifi-1.10.0-SNAPSHOT/logs/kafka.json

JSON Configuration File (kafka.json)

{

"registryUrl": "http://tspann-xx-xx:18080",

"bucketId": "140b30f0-5a47-4747-9021-19d4fde7f993",

"flowId": "402814a2-fb7a-4b19-a641-9f4bb191ed67",

"flowVersion": "1",

"ssl": {

"keystoreFile": "",

"keystorePass": "",

"keyPass": "",

"keystoreType": "",

"truststoreFile": "/Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home/lib/security/cacerts",

"truststorePass": "changeit",

"truststoreType": "JKS"

},

"parameters": {

"broker" : "x.x.x.x.x:9092"

}

Example Output

12:32:37.717 [kafka-producer-network-thread | producer-1] DEBUG

Flow Succeeded

Other Runtime Options:

RunYARNServiceFromRegistry <YARN RM URL> <Docker Image Name> <Service Name> <# of Containers> --file <File Name>

RunOpenwhiskActionServer <Port>

References:

Add A S2S Port Inside Process Group

ParquetReader

ParquetRecordSetWriter