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HADOOP-16826. ABFS: update abfs.md to include config keys for identity transformation 

Contributed by Karthick Narendran
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Karthick Narendran 2020-01-23 20:35:57 -08:00 committed by DadanielZ
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hadoop-tools/hadoop-azure/src/site/markdown/abfs.md
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@ -857,6 +857,37 @@ signon page for humans, even though it is a machine calling.
1. The URL is wrong —it is pointing at a web page unrelated to OAuth2.0
1. There's a proxy server in the way trying to return helpful instructions.
### `java.io.IOException: The ownership on the staging directory /tmp/hadoop-yarn/staging/user1/.staging is not as expected. It is owned by <principal_id>. The directory must be owned by the submitter user1 or user1`
When using [Azure Managed Identities](https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/overview), the files/directories in ADLS Gen2 by default will be owned by the service principal object id i.e. principal ID & submitting jobs as the local OS user 'user1' results in the above exception.
The fix is to mimic the ownership to the local OS user, by adding the below properties to`core-site.xml`.
```xml
<property>
<name>fs.azure.identity.transformer.service.principal.id</name>
<value>service principal object id</value>
<description>
An Azure Active Directory object ID (oid) used as the replacement for names contained
in the list specified by “fs.azure.identity.transformer.service.principal.substitution.list”.
Notice that instead of setting oid, you can also set $superuser here.
</description>
</property>
<property>
<name>fs.azure.identity.transformer.service.principal.substitution.list</name>
<value>user1</value>
<description>
A comma separated list of names to be replaced with the service principal ID specified by
“fs.azure.identity.transformer.service.principal.id”. This substitution occurs
when setOwner, setAcl, modifyAclEntries, or removeAclEntries are invoked with identities
contained in the substitution list. Notice that when in non-secure cluster, asterisk symbol *
can be used to match all user/group.
</description>
</property>
```
Once the above properties are configured, `hdfs dfs -ls abfs://container1@abfswales1.dfs.core.windows.net/` shows the ADLS Gen2 files/directories are now owned by 'user1'.
## <a name="testing"></a> Testing ABFS
See the relevant section in [Testing Azure](testing_azure.html).