![]() The key is encrypted and stored in Hadoop configuration.Īzure Active Directory OAuth Bearer Token: Azure AD bearer tokens are acquired and refreshed by the driver using either the identity of the end user or a configured Service Principal. Shared Key: This permits users access to ALL resources in the account. Full details of the available authentication schemes are provided in the Azure Storage security guide. The ABFS driver supports two forms of authentication so that the Hadoop application may securely access resources contained within a Data Lake Storage Gen2 capable account. The structure of the URI is: using this URI format, standard Hadoop tools and frameworks can be used to reference these resources: hdfs dfs -mkdir -p dfs -put flight_delays.csv the ABFS driver translates the resource(s) specified in the URI to files and directories and makes calls to the Azure Data Lake Storage REST API with those references. The URI scheme is documented in Use the Azure Data Lake Storage Gen2 URI. However, there are some functions that the driver must still perform: URI scheme to reference dataĬonsistent with other file system implementations within Hadoop, the ABFS driver defines its own URI scheme so that resources (directories and files) may be distinctly addressed. ![]() Thus, the Azure Blob File System driver (or ABFS) is a mere client shim for the REST API. Given that the Hadoop file system is also designed to support the same semantics there's no requirement for a complex mapping in the driver. The Azure Data Lake Storage REST interface is designed to support file system semantics over Azure Blob Storage. The ABFS driver was designed to overcome the inherent deficiencies of WASB. ![]() Additionally, some operations such as FileSystem.rename() and lete() when applied to directories require the driver to perform a vast number of operations (due to object stores lack of support for directories) which often leads to degraded performance. This driver continues to support this model, providing high performance access to data stored in blobs, but contains a significant amount of code performing this mapping, making it difficult to maintain. This driver performed the complex task of mapping file system semantics (as required by the Hadoop FileSystem interface) to that of the object store style interface exposed by Azure Blob Storage. The Windows Azure Storage Blob driver or WASB driver provided the original support for Azure Blob Storage. Prior capability: The Windows Azure Storage Blob driver By the ABFS driver, many applications and frameworks can access data in Azure Blob Storage without any code explicitly referencing Data Lake Storage Gen2. ABFS is part of Apache Hadoop and is included in many of the commercial distributions of Hadoop. Data Lake Storage Gen2 allows users of Azure Blob Storage access to a new driver, the Azure Blob File System driver or ABFS. One of the primary access methods for data in Azure Data Lake Storage Gen2 is via the Hadoop FileSystem.
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