[
https://issues.apache.org/jira/browse/HADOOP-18610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17809168#comment-17809168
]
ASF GitHub Bot commented on HADOOP-18610:
-----------------------------------------
steveloughran commented on PR #5953:
URL: https://github.com/apache/hadoop/pull/5953#issuecomment-1902738972
you can use env var resolution within a hadoop core-site file; which lets
you at the values with defaults when unset. on locked down config loading
(oozie etc) then only the default is valid.
```
${env.LOCAL_DIRS:-some.default}/
```
so: no need to add explicit resolution, just document or set as default.
example, s3a uses temp dirs in yarn containers automatically.
```xml
<property>
<name>fs.s3a.buffer.dir</name>
<value>${env.LOCAL_DIRS:-${hadoop.tmp.dir}}/s3a</value>
<description>Comma separated list of directories that will be used to
buffer file
uploads to.
Yarn container path will be used as default value on yarn applications,
otherwise fall back to hadoop.tmp.dir
</description>
</property>
```
> ABFS OAuth2 Token Provider to support Azure Workload Identity for AKS
> ---------------------------------------------------------------------
>
> Key: HADOOP-18610
> URL: https://issues.apache.org/jira/browse/HADOOP-18610
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools
> Affects Versions: 3.3.4
> Reporter: Haifeng Chen
> Priority: Critical
> Labels: pull-request-available
> Attachments: HADOOP-18610-preview.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> In Jan 2023, Microsoft Azure AKS replaced its original pod-managed identity
> with with [Azure Active Directory (Azure AD) workload
> identities|https://learn.microsoft.com/en-us/azure/active-directory/develop/workload-identities-overview]
> (preview), which integrate with the Kubernetes native capabilities to
> federate with any external identity providers. This approach is simpler to
> use and deploy.
> Refer to
> [https://learn.microsoft.com/en-us/azure/aks/workload-identity-overview|https://learn.microsoft.com/en-us/azure/aks/workload-identity-overview.]
> and [https://azure.github.io/azure-workload-identity/docs/introduction.html]
> for more details.
> The basic use scenario is to access Azure cloud resources (such as cloud
> storage) from Kubernetes (such as AKS) workload using Azure managed identity
> federated with Kubernetes service account. The credential environment
> variables in pod projected by Azure AD workload identity are like following:
> AZURE_AUTHORITY_HOST: (Injected by the webhook,
> [https://login.microsoftonline.com/])
> AZURE_CLIENT_ID: (Injected by the webhook)
> AZURE_TENANT_ID: (Injected by the webhook)
> AZURE_FEDERATED_TOKEN_FILE: (Injected by the webhook,
> /var/run/secrets/azure/tokens/azure-identity-token)
> The token in the file pointed by AZURE_FEDERATED_TOKEN_FILE is a JWT (JASON
> Web Token) client assertion token which we can use to request to
> AZURE_AUTHORITY_HOST (url is AZURE_AUTHORITY_HOST + tenantId +
> "/oauth2/v2.0/token") for a AD token which can be used to directly access
> the Azure cloud resources.
> This approach is very common and similar among cloud providers such as AWS
> and GCP. Hadoop AWS integration has WebIdentityTokenCredentialProvider to
> handle the same case.
> The existing MsiTokenProvider can only handle the managed identity associated
> with Azure VM instance. We need to implement a WorkloadIdentityTokenProvider
> which handle Azure Workload Identity case. For this, we need to add one
> method (getTokenUsingJWTAssertion) in AzureADAuthenticator which will be used
> by WorkloadIdentityTokenProvider.
>
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