Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14065#discussion_r74104234
--- Diff: docs/running-on-yarn.md ---
@@ -525,16 +524,23 @@ token for the cluster's HDFS filesystem, and
potentially for HBase and Hive.
An HBase token will be obtained if HBase is in on classpath, the HBase
configuration declares
the application is secure (i.e. `hbase-site.xml` sets
`hbase.security.authentication` to `kerberos`),
-and `spark.yarn.security.tokens.hbase.enabled` is not set to `false`.
+and `spark.yarn.security.credentials.hbase.enabled` is not set to `false`.
Similarly, a Hive token will be obtained if Hive is on the classpath, its
configuration
includes a URI of the metadata store in `"hive.metastore.uris`, and
-`spark.yarn.security.tokens.hive.enabled` is not set to `false`.
+`spark.yarn.security.credentials.hive.enabled` is not set to `false`.
If an application needs to interact with other secure HDFS clusters, then
the tokens needed to access these clusters must be explicitly requested at
launch time. This is done by listing them in the
`spark.yarn.access.namenodes` property.
+Spark supports integrating with other security-aware services through Java
Services mechanism (see
+`java.util.ServiceLoader`). To do that, implementations of
`org.apache.spark.deploy.yarn.security.ServiceCredentialProvider`
+should be available to Spark by listing their names in the corresponding
file in the jar's
+`META-INF/services` directory. These plug-ins can be disabled by setting
+`spark.yarn.security.tokens.{service}.enabled` to `false`, where
`{service}` is the name of
+credential provider.
+
```
spark.yarn.access.namenodes
hdfs://ireland.example.org:8020/,hdfs://frankfurt.example.org:8020/
--- End diff --
Hmm, it seems like this example should be before the paragraph you're
adding.
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