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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

  • Preconfiguration of tiller and helm

DL-handler consists of two pods- the feeder and admin UI. It can be deployed by using cloudify Helm plug-in. Since the tiller IP address and port should be exposed and accessed by Helm, some additional configuration steps are needed. the detailed pre-configuration steps can be found in the Cloudify Helm Plugin wiki page.

  • Transfer blueprint component inputs file in DCAE bootstrap POD under / directory

Next, the cloudify input file of datalake should be placed into bootstrap pod. The input file can be found in ONAP git repository. Once you clone the repository, the blueprint file could be copied to the DCAE bootstrap pod through the command line.

Download Blueprint to the pod.
kubectl cp <source directory>/components/datalake-handler/dpo/blueprint/k8s-datalake-helm-input.yaml <DCAE bootstrap pod>:/blueprint -n onap


  • Log-in to the DCAE bootstrap POD's main container

The following command lets you log in to the DCAE bootstrap pod.


Validate Blueprint
kubectl exec -it <DCAE bootstrap pod> /bin/bash -n onap
  • Validate blueprint


Validate Blueprint
cfy blueprints validate /blueprints/k8s-dl-handler.yaml


  • Upload the blueprint to cloudify manager.


Validate Blueprint
cfy blueprint upload -b datalake /bluerint/k8s-helm.yaml


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

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

Verify Plugin version
cfy plugins list


  • Input file modification

Before deployment, the input file should be edited to point to your tiller service and helm repository. The input file should be placed in /blueprints.

Upload and deploy blueprint
tiller-server-ip: <YOUR_CLUSTER_IP>
tiller-server-port: <TILLER_EXPOSED_PORT>
namespace: onap
chart-repo-url: <YOUR_HELM_REPO>
stable-repo-url: <YOUR_STABLE_HELM_REPO>
chart-version: 1.0.0
component-name: dcae-datalake

Deploy Service


Upload and deploy blueprint
cfy install -b datalake -d datalake-deployment -i /blueprints/k8s-datalake-helm-input.yaml /blueprints/k8s-helm.yaml


To un-deploy

  • Uninstall running component and delete deployment

    Uninstall component
    cfy uninstall datalake-deployment

  • Delete blueprint

    Delete blueprint
    cfy blueprints delete dl-handler

Initial Validation

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

Verify Heartbeat is running
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.

Verify Logs for Dmaap poll

Functional tests

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


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

ServiceName
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

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


Consul Snapshot <>


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