Merge pull request #105537 from mimig1/patch-261

Update hdinsight-hadoop-compare-storage-options.md

Author: PRMerger14

articles/hdinsight/hdinsight-hadoop-compare-storage-options.md

@@ -6,7 +6,7 @@ ms.author: hrasheed
 ms.reviewer: jasonh
 ms.service: hdinsight
 ms.topic: conceptual
-ms.date: 06/17/2019
+ms.date: 02/25/2020
 ---
 
 # Compare storage options for use with Azure HDInsight clusters
@@ -23,7 +23,7 @@ The following table summarizes the Azure Storage services that are supported wit
 
 | Storage service | Account type | Namespace Type | Supported services | Supported performance tiers | Supported access tiers | HDInsight Version | Cluster type |
 |---|---|---|---|---|---|---|---|
-|Azure Data Lake Storage Gen2| General-purpose V2 | Hierarchical (filesystem) | Blob | Standard | Hot, Cool, Archive | 3.6+ | All |
+|Azure Data Lake Storage Gen2| General-purpose V2 | Hierarchical (filesystem) | Blob | Standard | Hot, Cool, Archive | 3.6+ | All except Spark 2.1 |
 |Azure Storage| General-purpose V2 | Object | Blob | Standard | Hot, Cool, Archive | 3.6+ | All |
 |Azure Storage| General-purpose V1 | Object | Blob | Standard | N/A | All | All |
 |Azure Storage| Blob Storage** | Object | Block Blob | Standard | Hot, Cool, Archive | All | All |
@@ -52,6 +52,9 @@ You can create a cluster using different combinations of services for primary an
 
 *=This could be one or multiple Data Lake Storage Gen2 accounts, as long as they are all setup to use the same managed identity for cluster access.
 
+> [!Note] 
+> Data Lake Storage Gen2 primary storage is not supported for Spark 2.1 clusters. 
+
 ## Use Azure Data Lake Storage Gen2 with Apache Hadoop in Azure HDInsight
 
 Azure Data Lake Storage Gen2 takes core features from Azure Data Lake Storage Gen1 and integrates them into Azure Blob storage. These features include a file system that is compatible with Hadoop, Azure Active Directory (Azure AD), and POSIX-based access control lists (ACLs). This combination allows you to take advantage of the performance of Azure Data Lake Storage Gen1 while also using the tiering and data life-cycle management of Blob storage.