HPE Ezmeral Data Fabric 6.2 is In Maintenance and transitions to "End of Maintenance" in June 2024. Please see the latest documentation.

About Release 6.2
This site contains documentation for HPE Ezmeral Data Fabric release 6.2 including installation, configuration, administration, and reference content, as well as content for the associated bundled ecosystem components and drivers.
6.2 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.
6.2 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
6.2 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.
- 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.
  - maprcli and REST API Syntax
    This section provides information about the HPE Ezmeral Data Fabric command API. Most commands can be run on the command-line interface (CLI), or by making REST requests programmatically or in a browser.
    - Overview
      Each command reference page includes the command syntax, a table that describes the parameters, and examples of command usage.
    - acerole validate
      Verifies given user roles for ACEs exists in the /opt/mapr/conf/m7_permissions_roles_refimpl.conf file.
    - acl
      Describes the acl commands used to access control lists (ACLs).
    - alarm
      Describes the alarm commands that perform functions related to system alarms.
    - audit
      Describes commands used to audit operations related to cluster management and data access.
    - blacklist
      Describes commands used to blacklist and to list blacklisted users.
    - cluster
      Manages cluster features, gateways, and cluster-wide settings.
    - config
      Lists configuration values for the data-fabric cluster.
    - dashboard info
      Displays a summary of information about the cluster.
    - dialhome
    - disk
      Lists disk parameters.
    - dump
      Returns key information about volumes, containers, storage pools, and MapR cluster services for debugging and troubleshooting.
      - dump balancerinfo
        Returns detailed information about the storage pools on a cluster. If there are any active container moves, the command returns information about the source and destination storage pools.
      - dump balancermetrics
        Returns a cumulative count of container moves and MB of data moved between storage pools.
      - dump cldbnodes
        Lists the nodes that contain container location database (CLDB) data.
      - dump containerinfo
        Returns detailed information about one or more specified containers.
      - dump cldbmetainfo
        Prints metadata from the container location database (CLDB) tables.
      - dump cldbstate
        Prints the state of the container location database (CLDB).
      - dump containers
        Returns information about containers in a cluster.
      - dump ecginfo
        Indicates whether rebuild is in progress for a container from CLDB.
      - dump replicationmanagerinfo
        Returns information about which containers are under or over replicated in a specified volume.
      - dump replicationmanagerqueueinfo
        Returns information that enables you to check the status of containers in various replication manager queues like under-replicated containers, and over-replicated containers, etc.
      - dump rereplicationinfo
        Returns information about the ongoing re-replication of replica containers.
      - dump rereplicationmetrics
        Displays information about containers that were copied by the replication manager.
      - dump rolebalancerinfo
        Returns information about active replication role switches.
      - dump rolebalancermetrics
        Returns the cumulative number of times that the replication role balancer has switched the replication role of name containers and data containers on the cluster.
      - dump supportdump
        Collects logs and other information about the node to help troubleshoot issues.
      - dump volumeinfo
        Returns information about volumes and the associated containers. For JSON formatted output, use the -json option from the command line.
      - dump volumenodes
        Returns information about the nodes on a volume.
      - dump zkinfo
        Returns the ZooKeeper znodes.
        Moving CLDB Data
        Describes how to move CLDB data to another node.
    - entity
      Manages entities (users and groups).
    - fid
      Displays information about HPE Ezmeral Data Fabric Database or file-system components that are identified by a FID.
    - file
      Lets you perform tiering operations at the file level.
    - filefilter
      Creates and modifies filters to restrict certain file types from being stored on specified volumes.
    - job
      Manages Hadoop jobs running on the cluster.
    - license
      Manages MapR licenses.
    - label
      Manages registration and modification of labels.
    - nfsmgmt
      Refreshes NFS exports and server cache.
    - nfs4mgmt
      Manages NFSv4 server.
    - node
      Manages nodes in the cluster
    - rlimit
      Manages resource usage limits for the cluster.
    - schedule
      Manages schedules.
    - security
    - service list
      Lists all services on the specified node, the memory allocated for each service, the state of each service, and log path for each service.
    - setloglevel
      Sets log level on individual services.
    - stream
      Manages stream functionality.
    - table
      Performs functions related to HPE Ezmeral Data Fabric Database tables.
    - tier
      Lets you create, modify, remove, and retrieve list of tiers and tiering rules.
    - trace
      Lets you view and modify the trace buffer, and the trace levels for the system modules.
    - urls
      Displays the status page URL for the specified service.
    - virtualip
      Manages virtual IP addresses for NFS nodes.
    - volume
      Manages volumes, snapshots and mirrors.
  - Utilities
    Contains information about various scripts and utilities, that help setup, maintain, and monitor clusters.
  - Configuration Files
    This section contains reference information about various configuration files.
  - Alarms Reference
    The pages in this section provide details about all of the types of alarms.
  - HPE Ezmeral Data Fabric Environment
    This section provides information associated with the Data Fabric environment.
- 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.
6.2 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.

Moving CLDB Data

Describes how to move CLDB data to another node.

About this task

In a Community Edition-licensed cluster, CLDB data must be recovered from a failed CLDB node and installed on another node. The cluster can continue normally as soon as the CLDB is started on another node.

For more information, see CLDB Failover.

Use the maprcli dump zkinfo command to identify the latest epoch of the CLDB, identify the nodes where replicates of the CLDB are stored, and select one of those nodes to serve the new CLDB node. Perform the following steps on any cluster node:

Procedure

Log in as root or use sudo for the following commands.
Issue the maprcli dump zkinfo command using the -json flag.
# maprcli dump zkinfo -json

The output displays the ZooKeeper znodes.

In the /datacenter/controlnodes/cldb/epoch/1 directory, locate the CLDB with the latest epoch.

{ "/datacenter/controlnodes/cldb/epoch/1/KvStoreContainerInfo":" Container ID:1 VolumeId:1 Master:10.250.1.15:5660-172.16.122.1:5660-192.168.115.1:5660--13-VALID Servers: 10.250.1.15:5660-172.16.122.1:5660-192.168.115.1:5660--13-VALID Inactive Servers: Unused Servers: Latest epoch:13" }

The Latest Epoch field identifies the current epoch of the CLDB data. In this example, the latest epoch is 13.

Select a CLDB from among the copies at the latest epoch. For example, 10.250.2.41:5660--13-VALID indicates that the node has a copy at epoch 13 (the latest epoch).