MapR 5.1 is at End of Life (EOL) and no longer supported. Please see the latest documentation. This documentation is not being updated.

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5.1 Reference
This section provides information about development content including MapR-FS and MapReduce development topics and reference content.
Reference Guide
maprcli and REST API Syntax
table
Performs functions related to MapR-DB tables.
table region
Manages table regions for MapR-DB binary and JSON tables.
table region pack
Manually triggers the packing of regions.

MapR 5.1 Documentation

5.1 Reference
This section provides information about development content including MapR-FS and MapReduce development topics and reference content.
- Development Guide
- Reference Guide
  - MapR Control System
  - Hadoop Commands
  - HBase Shell for MapR-DB
    You can manage MapR-DB tables using HBase shell commands and additional HBase shell commands included in the MapR distribution of Hadoop.
  - YARN commands
  - maprcli and REST API Syntax
    - Overview
      Each command reference page includes the command syntax, a table that describes the parameters, and examples of command usage.
    - 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.
    - nagios generate
      Generates a Nagios Object Definition file that describes the cluster nodes and the services running on each.
    - 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.
      - table create
        Creates a new MapR-DB binary or JSON table.
      - table cf
        Manages column families for MapR-DB tables.
      - table delete
        Deletes a MapR-DB binary or JSON table.
      - table edit
        Edits the attributes of a MapR-DB binary or JSON table.
      - table info
        Displays information about a MapR-DB binary or JSON table.
      - table region
        Manages table regions for MapR-DB binary and JSON tables.
        table region list
        Lists the regions that make up a specified table.
        table region merge
        Merges regions of a table together to reduce the number of regions that a table occupies.
        table region pack
        Manually triggers the packing of regions.
        table region split
        Splits a region in a table.
      - table replica
        Performs functions related to binary-table replication.
      - table replica elasticsearch
        Sets up and manages the indexing of MapR-DB binary tables in Elasticsearch.
      - table upstream
        Performs functions related to upstream sources for table replication.
    - task
      Manipulates information about the Hadoop jobs that are running on your cluster.
    - 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.
  - Alarms Reference
  - Utilities
  - Default MapR Configurations
  - Configuration Files
  - MapR Environment
  - MapR Parameters
  - Best Practices
  - Language Support for MapR-DB Tables
  - Glossary
    This section contains defintions for commonly used terms in MapR Converged Data Platform environments.
  - Source Code for MapR Software
- Glossary
  This section contains defintions for commonly used terms in MapR Converged Data Platform environments.

table region pack

Manually triggers the packing of regions.

MapR-DB automatically packs regions; however, you can use this command to reclaim space that is consumed by expired rows or to avoid read amplification.

Syntax

CLI

maprcli table region pack -path table path -fid fid|all [ -nthreads nthreads. default: 16 ]

REST

http[s]://<host>:<port>/rest/table/region/pack?path=<path>&fid=<fid>

NOTE: The mapr user is not treated as a superuser. MapR-DB does not allow the mapr user to run this command unless that user is given the relevant permission or permissions with access-control expressions.

Parameters

Parameter Description

path

Specifies the path to the table.

For a path on the local cluster, start the path at the volume mount point. For example, if you want to pack a table named test under volume1 which has a mount point at /volume1, specify the following path: /volume1/test

For a path on another cluster, you must also specify the cluster name in the path. For example, if you want to pack a table named customer under volume1 in the sanfrancisco cluster, specify the following path: /mapr/sanfrancisco/volume1/customer

fid Specifies that you want to pack all table regions or a single table region that you identify with a FID. The output of maprcli table region list lists the FIDs for the table.

nthreads Specifies the number of threads allocated to process the packing of table regions. Default:16

Example

Packs the specified region.

CLI

maprcli table region pack -path /user/test5 -fid 2086.32.131296

REST

https://myhost:8443/rest/table/region/pack?path=%2Fuser%2Ftest5&fid=2086.32.131296