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6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
Administrator's Reference
This section contains in-depth reference information for the administrator.
maprcli and REST API Syntax
This section provides information about the MapR command API. Most commands can be run on the command-line interface (CLI), or by making REST requests programmatically or in a browser.
volume
Manages volumes, snapshots and mirrors.
volume balancecontainers

6.0 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
- Administering Nodes
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the MapR-DB is done primarily via the command line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR-DB table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR-DB administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. You can replicate MapR-DB tables (binary and JSON) and MapR-ES streams. MapR 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 MapR security and manage secure clusters.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the MapR Data Access Gateway
  The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR 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 MapR 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
      Manages configuration values for the MapR cluster.
    - dashboard info
      Displays a summary of information about the cluster.
    - dialhome
    - disk
      Describes command for working with disks.
    - dump
      Returns key information about volumes, containers, storage pools, and MapR cluster services for debugging and troubleshooting.
    - entity
      Manages entities (users and groups).
    - fid
      Displays information about MapR-DB or file-system components that are identified by a FID.
    - job
      Manages Hadoop jobs running on the cluster.
    - license
      Manages MapR licenses.
    - nfsmgmt
      Refreshes NFS exports and server cache.
    - node
      Manages nodes in the cluster
    - rlimit
      Manages resource usage limits for the cluster.
    - schedule
      Manages schedules.
    - 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 MapR-DB tables.
    - 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.
      - volume audit
        Enables or disables auditing on the specified volume.
      - volume balancecontainers
      - volume balancinginfo
      - volume container move
        Moves a container. Permissions required: fc or m on the volume.
      - volume container switchmaster
        Switches the master replica for a specified container to another replica in the replica chain.
      - volume create
        Creates a volume.
      - volume dump create
        Creates a volume dump file containing data from a volume for distribution or restoration.
      - volume dump restore
        Restores or updates a volume from a dump file. Permissions required: fc or restore on the volume.
      - volume fixmountpath
        Corrects the mount path of a volume. Permissions required: fc or m on the volume.
      - volume info
        Displays information about the specified volume. For best results, use the -json option when running the command.
      - volume link create
        Creates a link to a volume. Permissions required: fc or m on the volume.
      - volume link remove
        Removes the specified symbolic link. Permissions required: fc or m on the volume.
      - volume list
      - volume mirror push
        Pushes the changes in a volume to all of its mirror volumes in the same cluster, and waits for each mirroring operation to complete.
      - volume mirror start
        Starts mirroring on the specified volume from its source volume.
      - volume mirror stop
        Stops mirroring on the specified volume.
      - volume modify
        Modifies an existing volume. Permissions required: m or fc on the volume.
      - volume mount
        Mounts one or more specified volumes. Permissions required: fc or m on the volume.
      - volume move
        Moves the specified volume or mirror to a different topology. Permissions required: m or fc on the volume.
      - volume remove
        Removes the specified volume or mirror. Permissions required: d or fc on the volume.
      - volume rename
        Renames the specified volume or mirror. Permissions required: fc or d on the volume.
      - volume showmounts
        Returns a list of mount points for the specified volume.
      - volume snapshot create
        Creates a snapshot of the specified volume, using the specified snapshot name.
      - volume snapshot list
        Displays info about a set of snapshots.
      - volume snapshot preserve
        Preserves one or more snapshots from expiration.
      - volume snapshot remove
        Removes one or more snapshots.
      - volume unmount
        Unmounts one or more mounted volumes. Permissions required: fc or m on the volume.
      - volume upgradeformat
        Upgrades and old-type volume to a new-type volume, which can in turn be used as a promotable mirror volume. Permissions required: m or fc on the volume.
  - Utilities
    This section contains information about various scripts and utilities.
  - 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.
  - MapR Environment
    This section provides information associated with the MapR environment.
- Troubleshooting Cluster Administration
- Best Practices for Backing Up MapR Information

volume balancecontainers

Balance the containers or stop the balancing of containers associated with the volume.

Syntax

CLI

maprcli volume balancecontainers 
    [ -cluster cluster_name ]
     -name <volume name>
    [ -cancel true ]

REST API

N/A

Parameters

Parameter	Description
`cancel`	Stop the balancing of containers associated with the volume. Value must be `true` to cancel balancing activities.
`cluster`	The name of the cluster to run the command on.
`name`	The name of the volume.

Examples

Start balancing the containers associated with a volume:

maprcli volume balancecontainers -name sampleVol

Stop balancing the containers associated with a volume:

maprcli volume balancecontainers -name sampleVol -cancel true