[GitHub] [incubator-yunikorn-site] avsamit6600 commented on a change in pull request #52: [YUNIKORN-651] Add document to explain how to define user identity

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avsamit6600 commented on a change in pull request #52:
URL: https://github.com/apache/incubator-yunikorn-site/pull/52#discussion_r630557853



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File path: docs/user_guide/usergroup_resolution.md
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@@ -0,0 +1,65 @@
+---
+id: usergroup_resolution
+title: User & Group Resolution
+---
+
+<!--
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+"License"); you may not use this file except in compliance
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+
+  http://www.apache.org/licenses/LICENSE-2.0
+
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+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
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+-->
+
+## User resolution
+
+User information is an important aspect of the scheduling cycle. It is one of the key identifier that can be used to determine the queue to which a job should be submitted. The Yunikorn Scheduler relies on the K8s Shim to provide user information. In the world of Kubernetes, there is no object defined that identfies the actual user. This is by design and more information can be found [here](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#users-in-kubernetes)
+
+Since, Kubernetes has no pre-defined field or resource for user information and individual cluster deployments with unique user identification tools can vary, we have defined a standard way of identifying the user. Yunikorn requires a Kubernetes [Label](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/) added. Using the [recommendation](https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/) provided here, the default label is defined as below:
+
+| Label                                          | Value |
+|----------------------------------------------- |---------------------	|
+| yunikorn.apache.org/username 	                 | User name. It can have duplicate entries but only the first value will be used. The default user is `nobody` |
+
+Example:
+```yaml
+metadata:
+  labels:
+    yunikorn.apache.org/username: "john"
+```
+NOTE: 
+In order to make this field uniquiely identifiable to the authorized user, the suggestion is to add this label as an immutable field by the user identification tool used by the cluster administrators. The cluster administrators or users are free to use any method or tool to add this field and value. This includes adding it manually at the time of submission. 

Review comment:
       Sure. I will add this as a TIP. 




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