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

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
  - Alarms Reference
  - Utilities
    - configure.sh
    - disksetup
    - fcdebug
      Dynamically set the loglevel to debug a library.
    - fsck
    - expandaudit
    - gfsck
    - mapr-support-collect.sh
    - mapr-support-dump.sh
    - mrconfig
    - pullcentralconfig
    - cldbguts
    - stubfuse
    - Utilities for MapR-DB Binary Tables
    - Utilities for MapR-DB JSON Tables
    - Utilities for MapR Streams
  - 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.

pullcentralconfig

The script /opt/mapr/server/pullcentralconfig on each node pulls master configuration files from /var/mapr/configuration on the cluster to the local disk:

If the master configuration file is newer, the local copy is overwritten by the master copy
If the local configuration file is newer, no changes are made to the local copy

The volume mapr.configuration (normally mounted at /var/mapr/configuration) contains directories with master configuration files:

Configuration files in the default directory are applied to all nodes
To specify custom configuration files for individual nodes, create directories corresponding to individual hostnames. For example, the configuration files in a directory named /var/mapr/configuration/nodes/host1.r1.nyc would only be applied to the machine with the hostname host1.r1.nyc.

The following parameters in warden.conf control whether central configuration is enabled, the path to the master configuration files, and how often pullcentralconfig runs:

centralconfig.enabled — Specifies whether to enable central configuration.
pollcentralconfig.interval.seconds--- The frequency to check for configuration updates, in seconds.