Replica support in Participant

In the current implementation, ACM supports multi-participant with same supported element Type but different participantId, so they need different properties file.

In order to support replica, it needs to support multi-participant using same properties file.

Note:

In a scenario of high number of compositions, if participant is restarting it will be slow-down the restarting action: AC-runtime will send a message for each composition primed and instance deployed to the participant.
To avoid the restarting action, participant needs a database support;
In a scenario where a participant is stuck in deploying, the instance will be in TIMEOUT and the user can take action like deploy again or undeploy. In that scenario the intermediary-participant has to receive the next message, kill the thread that is stuck in deploying and create a new thread.

Solution

Add dynamic participantId support and add database support,

Can a participant share the database with other replicas? Yes, if participants do not work with same composition/instance at same time.

Shared database with same supported element Type: a composition will be connected to a specific participantId, so only one participant will do actions with this composition and his instances. But it can fetch all compositions that are sharing.
In a restarting scenario the participant will change the participantId, and it can still fetch compositions and instances. ACM-runtime decides who has to work with, and Participant will do actions based on the message.

Changes in Participant:

UUID participantId will be generated in memory instead to fetch it in properties file.
cosumerGroup will be empty (kafka configuration): any intermediary-participant will have unique Kafka queue, so they will receive same message that will be filtered by participantId.
Add client support for no-sql database.
Add no-sql database or mock for Unit Tests.
Refactor CacheProvider to support insert/update, intermediary-participant can still use the cache in memory.
Any new/change composition and instance will be saved in database.
Refactor Participants that are using own cache in memory (Policy Participant saves policy and policy type in memory)

Changes in ACM-runtime:

When participant go OFF_LINE:
- if there are compositions connected to that participant, ACM-runtime will find other ON_LINE participant with same supported element type;
- if other ON_LINE participant is present it will change the connection with all compositions and instance;
- after that, it will execute restart for all compositions and instances to the ON_LINE participant.
When receive a participant REGISTER:
- it will check if there are compositions connected to a OFF_LINE participant with same supported element type;
- if there are, it will change the connection with all compositions and instances to that new registered participant;
- after that it will execute restart for all compositions and instances changed.
- Refactor restarting scenario to apply the restarting only for compositions and instances in transition

Changes in docker/Kubernetes environment

Refactor CSIT to support no-sql database
Refactor performance and stability test to support no-sql database
Refactor OOM to support no-sql database

Database in Ericsson ADP marketplace

The no-sql database could be one that is already in ADP marketplace,

Distributed Coordinator ED (Etcd): Distributed systems use etcd as a consistent key-value store for configuration management, service discovery, and coordinating distributed work. Many organizations use etcd to implement production systems such as container schedulers, service discovery services, and distributed data storage.
Document Database PG (PostgreSql)
Key Value Database AG (Apache Geode): Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing.(https://geode.apache.org/docs/guide/114/getting_started/intro_to_clients.html) or (https://docs.spring.io/spring-boot-data-geode-build/1.7.5/reference/html5/).
Key Value Database RD (Redis): RDB is NOT good if you need to minimize the chance of data loss in case Redis stops working.
Wide Column Database CD (Apache Cassandra)
Search Engine (Open Search): It supports Rest Api, https://opensearch.org/docs/latest/clients/java/

Open Search

Create a composition index

PUT https://{{address}}:9200/compositions

{
  "settings": {
    "index": {
      "number_of_shards": 2,
      "number_of_replicas": 1
    }
  },
  "mappings": {
    "properties": {
      "compositionId": {
        "type": "text"
      }
    }
  }
}

Create a composition document

POST https://{{address}}:9200/compositions/_doc/0da7f17d-68d4-47f3-9dbf-b380413c5fad

{
  "compositionId": "0da7f17d-68d4-47f3-9dbf-b380413c5fad",
  "automationCompositionElementDefinitionList": [
    {
      "acElementDefinitionId": {
        "name": "onap.policy.clamp.ac.element.K8S_StarterAutomationCompositionElement",
        "version": "1.2.3"
      },
      "automationCompositionElementToscaNodeTemplate": {
        "type": "org.onap.policy.clamp.acm.K8SMicroserviceAutomationCompositionElement",
        "type_version": "1.0.0",
        "properties": {
          "provider": "ONAP",
          "startPhase": 0,
          "uninitializedToPassiveTimeout": 180,
          "podStatusCheckInterval": 30
        },
        "name": "onap.policy.clamp.ac.element.K8S_StarterAutomationCompositionElement",
        "version": "1.2.3",
        "metadata": {},
        "description": "Automation composition element for the K8S microservice for AC Element Starter"
      },
      "outProperties": {}
    },
    {
      "acElementDefinitionId": {
        "name": "onap.policy.clamp.ac.element.K8S_BridgeAutomationCompositionElement",
        "version": "1.2.3"
      },
      "automationCompositionElementToscaNodeTemplate": {
        "type": "org.onap.policy.clamp.acm.K8SMicroserviceAutomationCompositionElement",
        "type_version": "1.0.0",
        "properties": {
          "provider": "ONAP",
          "startPhase": 0,
          "uninitializedToPassiveTimeout": 180,
          "podStatusCheckInterval": 30
        },
        "name": "onap.policy.clamp.ac.element.K8S_BridgeAutomationCompositionElement",
        "version": "1.2.3",
        "metadata": {},
        "description": "Automation composition element for the K8S microservice for AC Element Bridge"
      },
      "outProperties": {}
    },
    {
      "acElementDefinitionId": {
        "name": "onap.policy.clamp.ac.element.K8S_SinkAutomationCompositionElement",
        "version": "1.2.3"
      },
      "automationCompositionElementToscaNodeTemplate": {
        "type": "org.onap.policy.clamp.acm.K8SMicroserviceAutomationCompositionElement",
        "type_version": "1.0.0",
        "properties": {
          "provider": "ONAP",
          "startPhase": 0,
          "uninitializedToPassiveTimeout": 180,
          "podStatusCheckInterval": 30
        },
        "name": "onap.policy.clamp.ac.element.K8S_SinkAutomationCompositionElement",
        "version": "1.2.3",
        "metadata": {},
        "description": "Automation composition element for the K8S microservice for AC Element Sink"
      },
      "outProperties": {}
    }
  ]
}

Fetch a composition document

GET https://{{address}}:9200/compositions/_doc/0da7f17d-68d4-47f3-9dbf-b380413c5fad

Create an instance index

PUT https://{{address}}:9200/instances

{
  "settings": {
    "index": {
      "number_of_shards": 2,
      "number_of_replicas": 1
    }
  },
  "mappings": {
    "properties": {
      "instanceId": {
        "type": "text"
      }
    }
  }
}

Create an instance document

POST https://{{address}}:9200/instances/_doc/caf50cde-11a2-4915-a49c-609762714a6f

{
    "instanceId": "caf50cde-11a2-4915-a49c-609762714a6f",
    "compositionId": "0da7f17d-68d4-47f3-9dbf-b380413c5fad",
    "deployState": "DEPLOYED",
    "lockState": "LOCKED",
    "elements": {
        "709c62b3-8918-41b9-a747-d21eb79c6c23": {
            "id": "709c62b3-8918-41b9-a747-d21eb79c6c23",
            "definition": {
                "name": "onap.policy.clamp.ac.element.Http_SinkAutomationCompositionElement",
                "version": "1.2.3"
            },
            "deployState": "DEPLOYED",
            "lockState": "LOCKED",
            "properties": {
                "baseUrl": "http://10.101.0.249:30802",
                "httpHeaders": {
                    "Content-Type": "application/json",
                    "Authorization": "Basic YWNtVXNlcjp6YiFYenRHMzQ="
                },
                "configurationEntities": [
                    {
                        "configurationEntityId": {
                            "name": "onap.policy.clamp.ac.sink",
                            "version": "1.0.0"
                        },
                        "restSequence": [
                            {
                                "restRequestId": {
                                    "name": "request3",
                                    "version": "1.0.1"
                                },
                                "httpMethod": "POST",
                                "path": "/activate",
                                "body": "{ \"receiverId\": { \"name\": \"onap.policy.clamp.ac.sink\", \"version\": \"1.0.0\" }, \"timerMs\": 20000, \"elementType\": \"SINK\", \"topicParameterGroup\": { \"server\": \"message-router\", \"listenerTopic\": \"POLICY_UPDATE_MSG\", \"publisherTopic\": \"AC_ELEMENT_MSG\", \"fetchTimeout\": 15000, \"topicCommInfrastructure\": \"dmaap\" } }",
                                "expectedResponse": 201
                            }
                        ]
                    }
                ]
            },
            "outProperties": {}
        },
        "709c62b3-8918-41b9-a747-d21eb79c6c24": {
            "id": "709c62b3-8918-41b9-a747-d21eb79c6c24",
            "definition": {
                "name": "onap.policy.clamp.ac.element.Http_StarterAutomationCompositionElement",
                "version": "1.2.3"
            },
            "deployState": "DEPLOYED",
            "lockState": "LOCKED",
            "properties": {
                "baseUrl": "http://10.101.0.249:30800",
                "httpHeaders": {
                    "Content-Type": "application/json",
                    "Authorization": "Basic YWNtVXNlcjp6YiFYenRHMzQ="
                },
                "configurationEntities": [
                    {
                        "configurationEntityId": {
                            "name": "onap.policy.clamp.ac.starter",
                            "version": "1.0.0"
                        },
                        "restSequence": [
                            {
                                "restRequestId": {
                                    "name": "request1",
                                    "version": "1.0.1"
                                },
                                "httpMethod": "POST",
                                "path": "/activate",
                                "body": "{ \"receiverId\": { \"name\": \"onap.policy.clamp.ac.startertobridge\", \"version\": \"1.0.0\" }, \"timerMs\": 20000, \"elementType\": \"STARTER\", \"topicParameterGroup\": { \"server\": \"message-router:3904\", \"listenerTopic\": \"POLICY_UPDATE_MSG\", \"publisherTopic\": \"AC_ELEMENT_MSG\", \"fetchTimeout\": 15000, \"topicCommInfrastructure\": \"dmaap\" } }",
                                "expectedResponse": 201
                            }
                        ]
                    }
                ]
            },
            "outProperties": {}
        },
        "709c62b3-8918-41b9-a747-d21eb79c6c25": {
            "id": "709c62b3-8918-41b9-a747-d21eb79c6c25",
            "definition": {
                "name": "onap.policy.clamp.ac.element.Http_BridgeAutomationCompositionElement",
                "version": "1.2.3"
            },
            "deployState": "DEPLOYED",
            "lockState": "LOCKED",
            "properties": {
                "baseUrl": "http://10.101.0.249:30801",
                "httpHeaders": {
                    "Content-Type": "application/json",
                    "Authorization": "Basic YWNtVXNlcjp6YiFYenRHMzQ="
                },
                "configurationEntities": [
                    {
                        "configurationEntityId": {
                            "name": "onap.policy.clamp.ac.bridge",
                            "version": "1.0.0"
                        },
                        "restSequence": [
                            {
                                "restRequestId": {
                                    "name": "request2",
                                    "version": "1.0.1"
                                },
                                "httpMethod": "POST",
                                "path": "/activate",
                                "body": "{ \"receiverId\": { \"name\": \"onap.policy.clamp.ac.bridgetosink\", \"version\": \"1.0.0\" }, \"timerMs\": 20000, \"elementType\": \"BRIDGE\", \"topicParameterGroup\": { \"server\": \"message-router:3904\", \"listenerTopic\": \"POLICY_UPDATE_MSG\", \"publisherTopic\": \"AC_ELEMENT_MSG\", \"fetchTimeout\": 15000, \"topicCommInfrastructure\": \"dmaap\" } }",
                                "expectedResponse": 201
                            }
                        ]
                    }
                ]
            },
            "outProperties": {}
        }
    },
    "stateChangeResult": "NO_ERROR"
}

Fetch an instance document

GET https://{{address}}:9200/instances/_doc/caf50cde-11a2-4915-a49c-609762714a6f

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