snleee commented on a change in pull request #6531:
URL: https://github.com/apache/incubator-pinot/pull/6531#discussion_r573430961



##########
File path: 
pinot-plugins/pinot-file-system/pinot-adls/src/main/java/org/apache/pinot/plugin/filesystem/ADLSGen2PinotFS.java
##########
@@ -106,24 +118,75 @@ public void init(PinotConfiguration config) {
     // TODO: consider to add the encryption of the following config
     String accessKey = config.getProperty(ACCESS_KEY);
     String fileSystemName = config.getProperty(FILE_SYSTEM_NAME);
+    String clientId = config.getProperty(CLIENT_ID);
+    String clientSecret = config.getProperty(CLIENT_SECRET);
+    String tenantId = config.getProperty(TENANT_ID);
 
     String dfsServiceEndpointUrl = HTTPS_URL_PREFIX + accountName + 
AZURE_STORAGE_DNS_SUFFIX;
     String blobServiceEndpointUrl = HTTPS_URL_PREFIX + accountName + 
AZURE_BLOB_DNS_SUFFIX;
 
-    StorageSharedKeyCredential sharedKeyCredential = new 
StorageSharedKeyCredential(accountName, accessKey);
+    DataLakeServiceClientBuilder dataLakeServiceClientBuilder = new 
DataLakeServiceClientBuilder().endpoint(dfsServiceEndpointUrl);
+    BlobServiceClientBuilder blobServiceClientBuilder = new 
BlobServiceClientBuilder().endpoint(blobServiceEndpointUrl);
+
+    if (accountName!= null && accessKey != null) {
+      LOGGER.info("Authenticating using the access key to the account.");
+      StorageSharedKeyCredential sharedKeyCredential = new 
StorageSharedKeyCredential(accountName, accessKey);
+      dataLakeServiceClientBuilder.credential(sharedKeyCredential);
+      blobServiceClientBuilder.credential(sharedKeyCredential);
+    } else if (clientId != null && clientSecret != null && tenantId != null) {
+      LOGGER.info("Authenticating using Azure Active Directory");
+      ClientSecretCredential clientSecretCredential = new 
ClientSecretCredentialBuilder()
+          .clientId(clientId)
+          .clientSecret(clientSecret)
+          .tenantId(tenantId)
+          .build();
+      dataLakeServiceClientBuilder.credential(clientSecretCredential);
+      blobServiceClientBuilder.credential(clientSecretCredential);
+    } else {
+      // Error out as at least one mode of auth info needed
+      throw new IllegalArgumentException("Expecting either (accountName, 
accessKey) or (clientId, clientSecret, tenantId)");
+    }
 
-    DataLakeServiceClient serviceClient = new 
DataLakeServiceClientBuilder().credential(sharedKeyCredential)
-        .endpoint(dfsServiceEndpointUrl)
-        .buildClient();
+    _blobServiceClient = blobServiceClientBuilder.buildClient();
+    DataLakeServiceClient serviceClient = 
dataLakeServiceClientBuilder.buildClient();
+    _fileSystemClient = getOrCreateClientWithFileSystem(serviceClient, 
fileSystemName);
 
-    _blobServiceClient =
-        new 
BlobServiceClientBuilder().credential(sharedKeyCredential).endpoint(blobServiceEndpointUrl).buildClient();
-    _fileSystemClient = serviceClient.getFileSystemClient(fileSystemName);
     LOGGER.info("ADLSGen2PinotFS is initialized (accountName={}, 
fileSystemName={}, dfsServiceEndpointUrl={}, "
             + "blobServiceEndpointUrl={}, enableChecksum={})", accountName, 
fileSystemName, dfsServiceEndpointUrl,
         blobServiceEndpointUrl, _enableChecksum);
   }
 
+  /**
+   * Returns the DataLakeFileSystemClient to the specified file system 
creating if it doesn't exist.
+   *
+   * @param serviceClient authenticated data lake service client to an account
+   * @param fileSystemName name of the file system (blob container)
+   * @return DataLakeFileSystemClient with the specified fileSystemName.
+   */
+  @VisibleForTesting
+  public DataLakeFileSystemClient 
getOrCreateClientWithFileSystem(DataLakeServiceClient serviceClient,

Review comment:
       @rkanumul If Gen1 code automatically creates the top-level blob 
container, I think that we should change that. I still think that our code 
should not create the top-level container and we should assume that they are 
pre-generated. Pinot should be able to generate any files/directories within 
the container. 
   
   As I mentioned above, each customer would want to configure this container 
differently so that it makes sense for customers to prepare the ADLS Gen1/Gen2 
before hooking to the Pinot. I don't see much benefit of auto-creating the 
container with some default settings.




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