docs: Adding a custom Data Platform doc (#3561)

docs-website/sidebars.js

@@ -189,6 +189,7 @@ module.exports = {
       "datahub-web-react/src/app/analytics/README",
       "metadata-ingestion/developing",
       "docker/airflow/local_airflow",
+      "docs/how/add-custom-data-platform",
     ],
     Components: [
       "datahub-web-react/README",

docs/how/add-custom-data-platform.md

@@ -0,0 +1,105 @@
+# Adding a custom Dataset Data Platform
+
+A Data Platform represents a 3rd party system from which [Metadata Entities](https://datahubproject.io/docs/metadata-modeling/metadata-model/) are ingested from. Each Dataset that is ingested is associated with a single platform, for example MySQL, Snowflake, Redshift, or BigQuery.
+
+There are some cases in which you may want to add a custom Data Platform identifier for a Dataset. For example,
+you have an internal data system that is not widely available, or you're using a Data Platform that is not natively supported by DataHub.
+
+To do so, you can either change the default Data Platforms that are ingested into DataHub *prior to deployment time*, or ingest
+a new Data Platform at runtime. You can use the first option if you're able to periodically merge new Data Platforms from the OSS
+repository into your own. It will cause the custom Data Platform to be re-ingested each time you deploy DataHub, meaning that
+your custom Data Platform will persist even between full cleans (nukes) of DataHub. 
+
+## Changing Default Data Platforms
+
+Simply make a change to the [data_platforms.json](https://github.com/linkedin/datahub/blob/master/metadata-service/war/src/main/resources/boot/data_platforms.json) 
+file to add a custom Data Platform:
+
+```
+[ 
+  .....
+  {
+    "urn": "urn:li:dataPlatform:MyCustomDataPlatform",
+    "aspect": {
+      "name": "My Custom Data Platform",
+      "type": "OTHERS",
+      "logoUrl": "https://<your-logo-url>"
+    }
+  }
+]
+```
+
+## Ingesting Data Platform at runtime
+
+You can also ingest a Data Platform at runtime using either a file-based ingestion source, or using a normal curl to the
+[GMS Rest.li APIs](https://datahubproject.io/docs/metadata-service#restli-api). 
+
+### Using File-Based Ingestion Recipe
+
+**Step 1** Define a JSON file containing your custom Data Platform
+
+```
+// my-custom-data-platform.json 
+[
+  {
+    "auditHeader": null,
+    "proposedSnapshot": {
+      "com.linkedin.pegasus2avro.metadata.snapshot.DataPlatformSnapshot": {
+        "urn": "urn:li:dataPlatform:MyCustomDataPlatform",
+        "aspects": [
+          {
+            "com.linkedin.pegasus2avro.dataplatform.DataPlatformInfo": {
+              "datasetNameDelimiter": "/",
+              "name": "My Custom Data Platform",
+              "type": "OTHERS",
+              "logoUrl": "https://<your-logo-url>"
+            }
+          }
+        ]
+      }
+    },
+    "proposedDelta": null
+  }
+]
+```
+
+**Step 2**: Define an [ingestion recipe](https://datahubproject.io/docs/metadata-ingestion/#recipes) 
+
+```
+---
+# see https://datahubproject.io/docs/metadata-ingestion/source_docs/file for complete documentation
+source:
+  type: "file"
+  config:
+    filename: "./my-custom-data-platform.json"
+
+# see https://datahubproject.io/docs/metadata-ingestion/sink_docs/datahub for complete documentation
+sink:
+  ... 
+```
+
+### Using Rest.li API
+
+You can also issue a normal curl request to the Rest.li `/entities` API to add a custom Data Platform.
+
+```
+curl 'http://localhost:8080/entities?action=ingest' -X POST --data '{
+   "entity":{
+      "value":{
+         "com.linkedin.metadata.snapshot.DataPlatformSnapshot":{
+            "aspects":[
+               {
+                  "com.linkedin.dataplatform.DataPlatformInfo":{
+                      "datasetNameDelimiter": "/",
+                      "name": "My Custom Data Platform",
+                      "type": "OTHERS",
+                      "logoUrl": "https://<your-logo-url>"
+                  }
+               }
+            ],
+            "urn":"urn:li:dataPlatform:MyCustomDataPlatform"
+         }
+      }
+   }
+}'
+```