Data Index standalone service

Data Index service deployment.

Data Index service can be deployed referencing directly a distributed Data Index image. There are different images provided that take into account what persistence layer is required in each case. In each distribution, there are some properties to configure things like the connection with the database or the communication with other services. The goal is to configure the container to allow to process ProcessInstances and Jobs events that incorporate their related data, to index and store that in the database and finally, to provide the Data Index GraphQL endpoint to consume it.

Data Index distributions

Data Index service can be deployed referencing directly a distributed Data Index image. Here there are the different Data Index image distributions that can be found in Quay.io/kiegroup:

Image of data-index different available distributions

Data Index standalone service deployment

There are several ways to deploy the Data Index service. But there are some common points in all the deployments:

Reference the right Data Index image to match with the type of Database that will store the indexed data.
Provide the database connection properties, to allow data index store the indexed data. Data Index service does not initialize its database schema automatically. To initialize the database schema, you need to enable Flyway migration by setting QUARKUS_FLYWAY_MIGRATE_AT_START=true.
Define the KOGITO_DATA_INDEX_QUARKUS_PROFILE to set the way that the events will be connected (by default: kafka-event-support).

Data Index deployment resource example using Kafka eventing:

Here you can see in example, how the Data Index resource definition can be deployed as part of a docker-compose definition

Example of DataIndex resource in a docker-compose deployment using Kafka eventing:

  data-index:
    container_name: data-index
    image: quay.io/kiegroup/kogito-data-index-postgresql:latest (1)
    ports:
      - "8180:8080"
    depends_on:
      postgres:
        condition: service_healthy
    volumes:
      - ./../target/classes/META-INF/resources/persistence/protobuf:/home/kogito/data/protobufs/
    environment:
      QUARKUS_DATASOURCE_JDBC_URL: "jdbc:postgresql://postgres:5432/kogito" (2)
      QUARKUS_DATASOURCE_USERNAME: kogito-user
      QUARKUS_DATASOURCE_PASSWORD: kogito-pass
      QUARKUS_HTTP_CORS_ORIGINS: "/.*/"
      KOGITO_DATA_INDEX_QUARKUS_PROFILE: kafka-events-support (3)
      QUARKUS_FLYWAY_MIGRATE_AT_START: "true" (4)
      QUARKUS_HIBERNATE_ORM_DATABASE_GENERATION: update

1	Reference the right Data Index image to match with the type of Database, in this case `quay.io/kiegroup/kogito-data-index-postgresql:latest`
2	Provide the database connection properties.
3	When `KOGITO_DATA_INDEX_QUARKUS_PROFILE` is not present, the Data Index is configured to use Kafka eventing.
4	To initialize the database schema at start using flyway.

When Kafka eventing is used, workflow applications need to be configured to send the events to the Kafka topic kogito-processinstances-events allowing Data Index service to consume the generated events.

In this case Data Index is ready to consume the events sent to the topics: kogito-processinstances-events and kogito-jobs-events.

It is important to configure the workflows application to send the events to the topic kogito-processinstances-events using the connector smallrye-kafka. More information about how to configure workflows Kafka eventing is available in Consuming and producing events using Apache Kafka in Quarkus guide.

To explore the specific configuration to add to the workflow to connect with Data Index using Kafka eventing see Data Index Kafka eventing

Example of configuration in Kogito Serverless Workflow application passed in application.properties to configure connection with Data Index using Kafka connector:

mp.messaging.outgoing.kogito-processinstances-events.connector=smallrye-kafka
mp.messaging.outgoing.kogito-processinstances-events.topic=kogito-processinstances-events
mp.messaging.outgoing.kogito-processinstances-events.value.serializer=org.apache.kafka.common.serialization.StringSerializer

Usually, when using docker-compose the workflow application generates the container image that is added to docker-compose. If the Kafka eventing configuration values weren’t there before the container image creation, they need to be passed as environment variables.

More details about customizing Quarkus generated images can be found in Quarkus Container Images Customizing guide.

Data Index deployment resource example using Knative eventing:

This deployment definition resource shows how the Data Index service configured and deployed can connect with an existing PostgreSQL database and to consume Knative events.

Example DataIndex resource with PostgreSQL persistence and Knative eventing in a kubernetes environment :

apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/name: data-index-service-postgresql
    app.kubernetes.io/version: 2.0.0-SNAPSHOT
  name: data-index-service-postgresql
spec:
  ports:
    - name: http
      port: 80
      targetPort: 8080
  selector:
    app.kubernetes.io/name: data-index-service-postgresql
    app.kubernetes.io/version: 2.0.0-SNAPSHOT
  type: ClusterIP
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/name: data-index-service-postgresql
    app.kubernetes.io/version: 2.0.0-SNAPSHOT
  name: data-index-service-postgresql
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: data-index-service-postgresql
      app.kubernetes.io/version: 2.0.0-SNAPSHOT
  template:
    metadata:
      labels:
        app.kubernetes.io/name: data-index-service-postgresql
        app.kubernetes.io/version: 2.0.0-SNAPSHOT
    spec:
      containers:
        - name: data-index-service-postgresql
          image: quay.io/kiegroup/kogito-data-index-postgresql:latest (1)
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
              name: http
              protocol: TCP
          env:
            - name: KUBERNETES_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: QUARKUS_DATASOURCE_USERNAME (2)
              value: postgres
            - name: QUARKUS_DATASOURCE_PASSWORD
              value: pass
            - name: QUARKUS_DATASOURCE_JDBC_URL
              value: jdbc:postgresql://newsletter-postgres:5432/postgres?currentSchema=data-index-service
            - name: QUARKUS_DATASOURCE_DB_KIND
              value: postgresql
            - name: QUARKUS_HIBERNATE_ORM_DATABASE_GENERATION
              value: update
            - name: QUARKUS_KAFKA_HEALTH_ENABLE
              value: "false"
            - name: QUARKUS_HTTP_CORS
              value: "true"
            - name: QUARKUS_HTTP_CORS_ORIGINS
              value: /.*/
            - name: QUARKUS_FLYWAY_MIGRATE_AT_START (4)
              value: "true"
            - name: KOGITO_DATA_INDEX_QUARKUS_PROFILE (3)
              value: "http-events-support"
            - name: QUARKUS_HTTP_PORT
              value: "8080"
---
apiVersion: eventing.knative.dev/v1
kind: Trigger (5)
metadata:
  name: data-index-service-postgresql-processes-trigger
spec:
  broker: default
  filter:
    attributes:
      type: ProcessInstanceEvent (6)
  subscriber:
    ref:
      apiVersion: v1
      kind: Service
      name: data-index-service-postgresql
    uri: /processes (7)
---
apiVersion: eventing.knative.dev/v1
kind: Trigger (5)
metadata:
  name: data-index-service-postgresql-jobs-trigger
spec:
  broker: default
  filter:
    attributes:
      type: JobEvent (6)
  subscriber:
    ref:
      apiVersion: v1
      kind: Service
      name: data-index-service-postgresql
    uri: /jobs (7)

1	Reference the right Data Index image to match with the type of Database, in this case `quay.io/kiegroup/kogito-data-index-postgresql:latest`
2	Provide the database connection properties
3	KOGITO_DATA_INDEX_QUARKUS_PROFILE: http-events-support to use the http-connector with Knative eventing.
4	To initialize the database schema at start using flyway
5	Trigger definition to filter the events that arrive to the Sink and pass them to Data Index
6	Type of event to filter
7	The URI where the Data Index service is expecting to consume those types of events.

This deployment is using KOGITO_DATA_INDEX_QUARKUS_PROFILE: http-events-support. Workflow applications need to configure the connector to use quarkus-http and send the events to the Knative K_SINK. You can find more information about Knative eventing and K_SINK environment variable in Consuming and producing events on Knative Eventing in Quarkus

To explore the specific configuration to add to the workflow to connect with Data Index using Knative eventing see Data Index Knative eventing

Example of configuration in Kogito Serverless Workflow application application.properties file to send events to Data Index using Knative eventing

mp.messaging.outgoing.kogito-processinstances-events.connector=quarkus-http
mp.messaging.outgoing.kogito-processinstances-events.url=${K_SINK}
mp.messaging.outgoing.kogito-processinstances-events.method=POST

If that configuration values weren’t there before the container image creation, they need to be passed as environment variables. More details about customizing Quarkus generated images can be found in Quarkus Container Images Customizing guide.

A full example where the Data Index service standalone is deployed using Knative eventing can be found as part of Quarkus Workflow Project with standalone services guide.

Data Index as a Quarkus Development service

When you use the Kogito Serverless Workflow Process Quarkus extension, a temporary Data Index service is automatically provisioned while the Quarkus application is running in development mode. When you use one of the following Quarkus extensions, the Dev Service is set up for immediate use:

Kogito Serverless Workflow main Quarkus extension

<dependency>
  <groupId>org.kie.kogito</groupId>
  <artifactId>kogito-quarkus</artifactId>
</dependency>

Kogito Serverless Workflow Quarkus extension

<dependency>
  <groupId>org.kie.kogito</groupId>
  <artifactId>kogito-quarkus-serverless-workflow</artifactId>
</dependency>

When you start your Quarkus project in development mode, an in-memory instance of the Data Index service is automatically started in the background. This feature is enabled by Quarkus Dev Services, and leverages Testcontainers to start an image of the Data Index service.

The Kogito Serverless Workflow Process Quarkus extension sets up your Quarkus application to automatically replicate any Kogito Serverless Workflow messaging events related to process instances or jobs into the provisioned Data Index instance.

Once the service is up and running, you can query the GraphQL interface directly using http://localhost:8180/graphql or using the Quarkus Dev UI console http://localhost:8080/q/dev.

The Data Index GraphQL endpoint can query for ProcessInstances and Jobs. For more information about operations and attributes to query, see GraphQL endpoint provided by Data Index section.

You can share the same Data Index instance across multiple Kogito Serverless Workflow services during development. Sharing Data Index instances is enabled by default, therefore, only one Data Index instance is started. This behavior can be adjusted to start multiple instances using the quarkus.kogito.devservices.shared property.

The Quarkus Dev Service also allows further configuration options including:

To disable Data Index Dev Service, use the quarkus.kogito.devservices.enabled=false property.
To change the port where the Data Index Dev Service runs, use the quarkus.kogito.devservices.port=8180 property.
To adjust the provisioned image, use quarkus.kogito.devservices.imageName=quay.io/kiegroup/kogito-data-index-ephemeral property.
To disable sharing the Data Index instance across multiple Quarkus applications, use quarkus.kogito.devservices.shared=false property.

For more information about Quarkus Dev Services, see Dev Services guide.

Data Index service configuration properties

The following table serves as a quick reference for commonly Data Index configuration properties supported.

Table 1. Common configuration properties
Property	Description	Type	Default value	Override at runtime
`QUARKUS_DATASOURCE_JDBC_URL`	The datasource URL	string		Yes
`QUARKUS_DATASOURCE_USERNAME`	The datasource username	string		Yes
`QUARKUS_DATASOURCE_PASSWORD`	The datasource password	string		Yes
`QUARKUS_DATASOURCE_DB_KIND`	The kind of database to connect: `postgresql`,..	string		Yes
`QUARKUS_FLYWAY_MIGRATE_AT_START`	`true` to execute Flyway automatically when the application starts, false otherwise.	boolean	false	Yes
`KOGITO_DATA_INDEX_QUARKUS_PROFILE`	(Only when referencing an image distribution) Allows to change the event connection type. The possible values are: `kafka-events-support` `http-events-support`	string	`kafka-events-support`	Yes
`kogito.persistence.query.timeout.millis`	Defines timeout for a query execution.	long	`10000`	Yes
`quarkus.kogito.devservices.enabled`	Enables or disables the Dev Services for workflows. By default, the Dev Services are enabled, unless an existing configuration is present.	boolean	`true`	No
`quarkus.kogito.devservices.port`	Defines the optional fixed port that the Dev Services listen to.	int	`8180`	No
`quarkus.kogito.devservices.image-name`	Defines the Data Index image to use in Dev Service.	string	`quay.io/kiegroup/kogito-data-index-ephemeral:1.41.0.Final`	No
`quarkus.kogito.devservices.shared`	Indicates if the Data Index instance, which is managed by Quarkus Dev Services, is shared.	boolean	`true`	No
`quarkus.kogito.devservices.service-name`	Defines the value of the label that is attached to the started container. This property is used when `shared` is set to `true`.	string	`kogito-data-index`	No

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