In-Situ Processing - datAcron

A component within the datAcron EU project; it provides a Flink component that processes a stream of raw messages (i.e., AIS Dynamic Messages), and enriches it with derived attributes such as min/max, average, and variance of original fields (See Output Format and Samples & Output Schema Description). In addition, a stream simulator for the raw messages is developed in the context of this module. It provides a feature to re-play the original stream of raw messages by generating a simulated new Kafka Stream and taking into the account the time delay between two consecutive messages of a trajectory. Furthermore, this delay can be scaled in/out by a configuration parameter (streamDelayScale).

Deployment on datAcron YARN cluster:

• Clone in-situ code: https://github.com/ehabqadah/in-situ-processing-datAcron.git
• Go the project directory cd in-situ-processing-datAcron.
• Update the config.properties as described the Configurations section below.
• Run mvn clean package -Pbuild-jar to compile and build the project jar.
• Run the raw input stream simulator java -cp ..../in-situ-processing-datAcron/target/in-situ-processing-2.0.0.jar eu.datacron.insitu.InputStreamSimulatorApp.
• Go the Flink directory cd .../flink-1.4.1
• Start Flink yarn session using

  cd ../flink-1.4.0/
  

./bin/yarn-session.sh -n 8 -tm 15360 -s 8

 to allocate 10 Task Managers, with 15 GB of memory and 8 processing slots for each task manger.


* To run In-situ module:

cd ../flink-1.4.0/

./bin/flink run -m yarn-cluster -yn 10 -ynm insitu_p..../in-situ-processing-datAcron/target/in-situ-processing-*.jar

* Check the output stream that has the kafka topic name in [config.properties](http://datacron2.ds.unipi.gr:9081/eqadah/in-situ-processing-datAcron/blob/master/src/main/resources/config.properties)  file, in particular, the value of `outputStreamTopicName` (e.g., ais_messages_in_situ_processing_out_v2).

# Output Format and Samples:
 * The data schema of the In-Situ Processing component's output as the following:
  ` timestamp,id,longitude,latitude,speed,heading,msgErrorFlag,turn,course,status,
NumberOfPoints,AverageDiffTime,LastDiffTime,MinDiffTime,MaxDiffTime,MaxSpeed,
MinSpeed,AverageSpeed,VarianceSpeed,MinLong,MaxLong,MinLat,MaxLat,MinTurn,MaxTurn,
MinHeading,MaxHeading,isChangeInArea,detectedAreas`
  * The following four samples of a trajectory (id=228037600​):
```javascript
2443660589,228037600,-4.342825,48.186092,9.1,511,,-127.0,197.7,15,686,14.83965014577259,11,7,311,10.2,5.6,9.12900874635568,0.3503100961334131,-4.45445,-4.316455,48.113506,48.20134,-127.0,-127.0,511,511,false,area1112315100;area1173315100
1443660600,228037600,-4.34293,48.18563,9.1,511,,-127.0,190.4,15,687,14.834061135371174,11,7,311,10.2,5.6,9.128966521106255,0.34980140644830476,-4.45445,-4.316455,48.113506,48.20134,-127.0,-127.0,511,511,true,
1443660610,228037600,-4.3429365,48.18521,9.1,511,,-127.0,180.5,15,688,14.827034883720925,10,7,311,10.2,5.6,9.128924418604647,0.3492941919618716,-4.45445,-4.316455,48.113506,48.20134,-127.0,-127.0,511,511,false, 1443660620,228037600,-4.3428435,48.184795,9.1,511,,-127.0,171.3,15,689,14.820029027576192,10,7,311,10.2,5.6,9.128882438316397,0.34878844626633326,-4.45445,-4.316455,48.113506,48.20134,-127.0,-127.0,511,511,true,area1112315100
1443660629,228037600,-4.3426933,48.184425,9.2,511,,-127.0,166.0,15,690,14.811594202898545,9,7,311,10.2,5.6,9.128985507246373,0.3482902751522813,-4.45445,-4.316455,48.113506,48.20134,-127.0,-127.0,511,511,false,area1112315100

Output Description:

• We use the same attributes and the delimiter (i.e., ",") as the AIS messages of NARI source with adding addition attributes computed by this module as depicted in the following table:

Index	Attribute	Data type	Description
[0]	timestamp	long	timestamp in UNIX epochs (i.e., milliseconds elapsed since 1970-01-01 00:00:00.000).
[1]	id	integer	A globally unique identifier for the moving object (usually, the MMSI of vessels).
[2]	longitude	double	Longitude (georeference: WGS 1984).
[3]	latitude	double	Latitude (georeference: WGS 1984).
[4]	speed	double	Speed over ground in knotsint (allowed values: 0-102.2 knots).
[5]	heading	integer	True heading in degrees (0-359), relative to true north.
[6]	msgErrorFlag	string	The MariWeb Security Appliance (MSA) error flags (if available).
[7]	turn	double	Rate of turn, right or left, 0 to 720 degrees per minute.
[8]	course	double	Course over ground (allowed values: 0-359.9 degrees).
[9]	status	integer	AIS Navigational Status reported by the vessel.
[10]	NumberOfPoints	long	The accumulated number of the received points i.e., AIS messages of the trajectory.
[11]	AverageDiffTime	double	The average of the time difference between the consecutive AIS messages of the trajectory
[12]	LastDiffTime	long	The time difference of the current message and the previous received message
[13]	MinDiffTime	long	The minimum value of time difference until the current AIS message.
[14]	MaxDiffTime	long	The maximum value of time difference until the current AIS message.
[15]	MaxSpeed	double	The maximum value of speed within the trajectory until the current AIS message.
[16]	MinSpeed	double	The minimum value of speed with the trajectory until the current AIS message.
[17]	AverageSpeed	double	The average value of the speed
[18]	VarianceSpeed	double	The sample variance of speed
[19]	MinLong	double	The minimum value of longitude of the trajectory until the current AIS message.
[20]	MaxLong	double	The maximum value of longitude of the trajectory until the current AIS message.
[21]	MinLat	double	The minimum value of latitude of the trajectory until the current AIS message.
[22]	MaxLat	double	The maximum value of latitude of the trajectory until the current AIS message.
[23]	MinTurn	double	The minimum value of turn until of the trajectory the current AIS message.
[24]	MaxTurn	double	The maximum value of turn until the of the trajectory the current AIS message.
[25]	MinHeading	int	The minimum value of heading until of the trajectory the current AIS message.
[26]	MaxHeading	int	The maximum value of heading until of the trajectory the current AIS message.
[27]	isChangeInArea	boolean	A flag to indicate if there is change in the area or not.
[28]	detectedAreas	string	empty string or list of area codes/names separated by ;

Configurations:

This section describes the different configurations/parameters that customize the execution of the In-Situ Processing module, and the following are the full parameters list of the module alongside with their description and usage, can be changed in the config.properties file.

Parameter Name	Example	Description	Used In
bootstrapServers	localhost:9092,localhost:9093	Kafka zookeeper host string	InSituProcessingApp & RawStreamSimulator
zookeeper	localhost:2181	A list of host/port pairs to use for establishing the initial connection to the Kafka cluster, for more details check here	InSituProcessingApp & RawStreamSimulator
inputStreamTopicName	aisInsituIn	This is the topic name of the output stream of the RawStreamSimulator and the topic name of the input stream of InSituProcessingApp, so both components are connected through a Kafka stream	InSituProcessingApp & RawStreamSimulator
outputStreamTopicName	aisInsituOut	The topic name of the output stream of the In-Situ Processing (i.e., enriched stream)	InSituProcessingApp
kafkaGroupId	in_situ	The Kafka consumer group name for the InSituProcessingApp if the streamSourceType is set as KAFKA	InSituProcessingApp
aisDataSetFilePath	./data/nari_test_dataset.csv	The path of the input dataset file	InSituProcessingApp & RawStreamSimulator
streamSourceType	FILE or KAFKA	This to select which source to be used as input for the In-Situ Processing module either directly by reading an input file (aisDataSetFilePath) or by ingesting a Kafka stream (inputStreamTopicName)	InSituProcessingApp
streamDelayScale	1.0	Scale factor of the time delay between the raw messages in the Stream simulator (i.e., simulated delay = actual delay *streamDelayScale )	RawStreamSimulator
inputDataSchema	nariRawStreamSchema.json , imisRawStreamSchema.json and imisFullRawStreamSchema.json	Specifies the schema of the input raw messages to support multiple sources such as IMIS Global and NARI files in the maritime use case	InSituProcessingApp & RawStreamSimulator
flinkCheckPointsPath	checkpoints	The directory of the Flink checkpoints	InSituProcessingApp & RawStreamSimulator
parallelism	8	The parallelism level of the Flink job	InSituProcessingApp
outputLineDelimiter	,	The separator of the line of the output stream	InSituProcessingApp
outputFilePath		The output path of enriched stream file if writeOutputStreamToFile is true	InSituProcessingApp
polygonsFilePath	polygons.csv	The file path of areas polygons	InSituProcessingApp

Run on stand alone Flink cluster (locally):

• To deploy the In-Situ Processing module on Flink cluster (locally):

  • Go the root directory of the project.
  • Edit the /in-situ-processing-datAcron/scripts/deployOnFlinkCluster.sh and update the correct directory of the Flink installation by changing the FLINK_DIR variable in the script.
  • Make sure that the script file has a permission to be executed, use /in-situ-processing-datAcron/scripts/deployOnFlinkCluster.sh.
  • Run the script by /in-situ-processing-datAcron/scripts/deployOnFlinkCluster.sh that submit the In-Situ Processing job to the local Flink cluster.

• To run the Raw AIS Messages Stream Simulator component on Flink cluster (locally):

  • Go the root directory of the project.
  • Edit the /in-situ-processing-datAcron/scripts/deploySimulatorOnFlink.sh and update the correct local directory of the Flink installation by changing the FLINK_DIR variable in the script.
  • Make sure that the script file has a permission to be executed, use chmod +x /in-situ-processing-datAcron/scripts/deploySimulatorOnFlink.sh.
  • Run the script by ./scripts/runSimulatorOnFlinkLocally.sh that submit the Stream simulator job to the Flink cluster.

Setup for local development:

• To Setup the Kafka cluster locally, run a predefined shell script scrips/setup-kafka.sh
• To execute the simulator for the stream of raw messages, run eu.datacron.insitu.InputStreamSimulatorApp.
• To execute the In-Situ Processing module: eu.datacron.insitu.InSituProcessingApp.
• To check the module output run the scrips/runOutputStreamKafkaConsumer.sh that lunches a consumer console for the output stream of the module.

Contributers:

[email protected],
[email protected]