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Overview

DataLake is a software component of ONAP that can systematically persist the events in DMaaP into supported Big Data storage systems. It has a Admin UI, where a system administrator configures which Topics to be monitored, and to which data storage to store the data. It is also used to manage the settings of the storage and associated data analytics tool. The second part is the Feeder, which does the data transfer work and is horizontal scalable. In the next release, R7, we will add the third component, Data Exposure Service (EDS), which will expose the data in the data storage via REST API for other ONAP components and external systems to consume. Each data exposure only requires simple configurations.

Architecture Diagram

Data Exposure Service will be available in R7.

Artifacts

Βlueprint (deployment artifact) :

Input file (deployment input)    :

Docker image                            : nexus3.onap.org:10001/onap/<>

Deployment Prerequisite/dependencies

In R6, the following storage are supported:
MongoDB

Couchbase

Elasticsearch and Kibana

HDFS

To use DataLake, you need to have at least one of these systems ready. Once DataLake is deployed, you can configure Topic and storage in the DataLake Admin UI.

Deployment Steps

Deployment of dl-handler can be done using Dashboard UI or CloudifyUI or via CLI. Below steps are based on CLI.

• Transfer blueprint component file in DCAE bootstrap POD under /blueprints directory
• Transfer blueprint component inputs file in DCAE bootstrap POD under / directory
• Log-in to the DCAE bootstrap POD's main container

• Validate blueprint

  Code Block
  language bash theme Midnight title Validate Blueprint linenumbers true
  cfy blueprints validate /blueprints/k8s-dl-handler.yaml

  
  

• Verify Plugin versions in target Cloudify instance match to blueprint imports

  Code Block
  language bash theme Midnight title Verify Plugin version linenumbers true
  cfy plugins list

  If the version of plugin used are different, update the blueprint import to match.

• Deploy Service

  Code Block
  language bash theme Midnight title Upload and deploy blueprint linenumbers true
  cfy install -b dl-handler -d dl-handler -i /k8s-dl-handler-inputs.yaml /blueprints/k8s-dl-handler.yaml

  
  

To un-deploy

• Uninstall running component and delete deployment

  Code Block
  language bash theme Midnight title Uninstall component linenumbers true
  cfy uninstall dl-handler

  
  

• Delete blueprint

  Code Block
  language bash theme Midnight title Delete blueprint linenumbers true
  cfy blueprints delete dl-handler

  
  

Initial Validation

After deployment, verify if dl-handler POD and mongoDB pod are running correctly

root@k8s-rancher:~# kubectl get pods -n onap | egrep "dl-handler"

And then check the logs to see if it can connect to DMaaP, polling for events.

Functional tests

Following default configuration is loaded into dl-handler (set in blueprint configuration)

<Add below steps to configure DL-Handler to subscribe and feed into external DL with step-by-step procedure>

Dynamic Configuration Update

As the dl-handler service periodically polls Consul KV using configbindingService api's - the run time configuration of dl-handler service can be updated dynamically without having to redeploy/restart the service. The updates to configuration can be triggered either from Policy (or CLAMP) or made directly in Consul.

Locate the servicename by executing into dl-handler Service pod and getting env HOSTNAME value

root@k8s-rancher:~# kubectl exec -it -n onap dep-s78f36f2daf0843518f2e25184769eb8b-dcae-dl-handler-servithzx2 /bin/bash
Defaulting container name to s78f36f2daf0843518f2e25184769eb8b-dcae-dl-handler-service.
Use 'kubectl describe pod/dep-s78f36f2daf0843518f2e25184769eb8b-dcae-dl-handler-servithzx2 -n onap' to see all of the containers in this pod.

misshtbt@s78f36f2daf0843518f2e25184769eb8b-dcae-dl-handler-service:~/bin$ env | grep HOSTNAME
HOSTNAME=s78f36f2daf0843518f2e25184769eb8b-dcae-dl-handler-service

Change the configuration for Service in KV-store through UI and verify if updates are picked

http://<k8snodeip>:30270/ui/#/dc1/kv/

Consul Snapshot <>