About Release 7.6.1
This site contains documentation for HPE Ezmeral Data Fabric release 7.6.1, including installation, configuration, administration, and reference content, as well as content for the associated ecosystem components and drivers.
7.6.1 Installation
This section contains information about installing and upgrading HPE Ezmeral Data Fabric software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a HPE Ezmeral Data Fabric cluster.
7.6.1 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
7.6.1 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
  Lists topics that help manage a data-fabric cluster.
- Administering Nodes
  Provides a synopsis of managing nodes in a cluster.
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of HPE Ezmeral Data Fabric clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the HPE Ezmeral Data Fabric Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the HPE Ezmeral Data Fabric Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. HPE Ezmeral Data Fabric Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering Data Fabric Gateways
  A HPE Ezmeral Data Fabric gateway mediates one-way communication between a source HPE Ezmeral Data Fabric cluster and a destination cluster. You can replicate HPE Ezmeral Data Fabric Database tables (binary and JSON) and HPE Ezmeral Data Fabric Streams streams. HPE Ezmeral Data Fabric gateways also apply updates from JSON tables to their secondary indexes and propagate Change Data Capture (CDC) logs.
- Administering Services
- Monitoring the Cluster
  This section describes how to monitor the health and performance of a MapR cluster.
- Configuring Security
  Describes how to configure security and manage secure clusters.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
  - Setting Up Cross-Cluster Security
    Provides an overview of the configure-crosscluster.sh utility that is used to set up security between two clusters.
  - Accessing External HDFS Clusters
    Outlines how to use protocols to connect to other clusters.
  - Using Java Applications with Secure Clusters
    Describes ramifications associated with using Java applications in a MapR secure environment.
- Administering the Data Access Gateway
  The HPE Ezmeral Data Fabric Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the HPE Ezmeral Data Fabric cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.
- Planning for High Availability
- Administrator's Reference
  This section contains in-depth reference information for the administrator.
- Troubleshooting Cluster Administration
  Lists the common errors and their solutions.
- Best Practices for Backing Up HPE Ezmeral Data Fabric Information
  Lists the best practices and performance considerations to follow when backing up HPE Ezmeral Data Fabric information.
- IPv6 Support in Data Fabric
  Describes the IPv6 support feature for Data Fabric.
7.6.1 Development
This section contains information related to application development for Ezmeral ecosystem components and HPE Ezmeral Data Fabric products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other data-fabric version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

Using Java Applications with Secure Clusters

Describes ramifications associated with using Java applications in a MapR secure environment.

A secure computing environment places additional requirements on the Java Virtual Machine (JVM) properties of Java clients. The JVMs launched by MapR with scripts, such as those used by the maprcli, hadoop, or hbase commands, have those properties automatically set by the MapR software. The MapR software attempts to set useful values for these properties.

When a JVM is used or launched directly, such as when you write a stand-alone Java program, any Java code that sets values for the following properties may cause issues on your cluster.

Property	Default Value	Description
java.security.auth.login.config	`/opt/mapr/conf/mapr.login.conf`	Path to the file that specifies JAAS configurations used by MapR.
javax.net.ssl.trustStore	`/opt/mapr/conf/ssl_truststore`	Controls the truststore used by MapR clients for HTTPS connections.
http.auth.preference	`basic`	The default setting disables JVM's default handling of SPNEGO, enabling MapR's Hadoop code to handle SPNEGO authentication.
zookeeper.saslprovider	`com.mapr.security.maprsasl.MaprSaslProvider`	Enables ZooKeeper security.
hadoop.login	`hadoop_default`	Controls the JAAS configuration used by MapR security.