MapR 5.2 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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5.2 Installation
This section contains information on installing and upgrading MapR. It also contains information on how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
Upgrading MapR or MEP Components
Depending on your current configuration, you may choose to upgrade the MapR version (MapR Core), ecosystem components, clients, or MapR Monitoring components.
Upgrading MapR Core
Describes the process of upgrading MapR Core.
Finishing the MapR Core Upgrade
This section provides post-upgrade steps for MapR Core.
Post-Upgrade Steps for MapR Core
After upgrading MapR core, several manual steps are required.
Step 5: Update Hadoop Configuration File
When manually upgrading (manual offline and manual rolling upgrade) from version 4.x to version 5.x and switching from classic mode to YARN mode, you must manually update the Hadoop configuration file.

MapR 5.2 Documentation

5.2 Installation
This section contains information on installing and upgrading MapR. It also contains information on how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
- Installing MapR or MEP Components
  Describes how to install MapR software and MapR Expansion Pack (MEP) components with the MapR Installer or without the MapR Installer.
- Installing MapR-XD
  Describes how to install MapR-XD software with or without the MapR Installer.
- Installing MapR in the Cloud
  Provides an overview of MapR cloud installer capabilities.
- Upgrading MapR or MEP Components
  Depending on your current configuration, you may choose to upgrade the MapR version (MapR Core), ecosystem components, clients, or MapR Monitoring components.
  - Upgrading MapR Core
    Describes the process of upgrading MapR Core.
    - Upgrading and your License
      If your are upgrading from MapR version 5.0 or earlier, the Base License file must be manually updated on all nodes in your cluster.
    - MapR Core Upgrade Process
      When you upgrade MapR Core, you will also upgrade a number of cluster components.
    - Planning the MapR Core Upgrade
      This section describes how to develop a sucessful plan for your upgrade process.
    - Preparing to Upgrade MapR Core
      Complete these pre-upgrade steps for MapR Core.
    - Upgrading MapR Core With the MapR Installer
      If the cluster that you want to upgrade was installed using the MapR Installer, use the MapR Installer to upgrade MapR core.
    - Performing a Maintenance Update
      Perform a maintenance update when you want to upgrade to a new patch version of MapR Core or apply a patch.
    - Preparing the Cluster for a Maintenance Update
      This section identifies how to prepare for applying either a minor update or a patch.
    - Upgrading MapR Core Without the MapR Installer
      If you installed the cluster without using the MapR Installer, you can upgrade without using the MapR Installer.
    - Finishing the MapR Core Upgrade
      This section provides post-upgrade steps for MapR Core.
      - Post-Upgrade Steps for MapR Core
        After upgrading MapR core, several manual steps are required.
        Step 1: Restart and Check Cluster Services
        After upgrading MapR Core using either a manual offline or rolling upgrade method (not upgrading with the MapR Installer) and upgrading your Ecosystem components, configure and restart the cluster and services. This procedure is not applicable to the scripted rolling upgrade method.
        Step 2: Manually Update Configuration Files
        After upgrading MapR Core without the MapR Installer (using a manual offline, scripted, or rolling upgrade method ), update your configuration files.
        Step 3: Manually Update your License
        The Base License may need to be updated manually depending on the MapR version you are upgrading from.
        Step 4: Enable New Features
        After upgrading MapR Core without the MapR Installer (using a manual offline, scripted, or rolling upgrade method ), enable the new features.
        Step 5: Update Hadoop Configuration File
        When manually upgrading (manual offline and manual rolling upgrade) from version 4.x to version 5.x and switching from classic mode to YARN mode, you must manually update the Hadoop configuration file.
        Running MapReduce v1 Jobs and YARN Applications when upgrading from 3.x
        If you are manually upgrading from MapR version 3.x, you need to prepare the cluster to run MapReduce v1 jobs and YARN applications.
      - Upgrading Clients
        After you upgrade your cluster, you may also need to upgrade your MapR Client or MapR POSIX Client.
      - Installing New MapR Core Features
        New features, such as MapR Monitoring, may require the installation of additional packages after an upgrade.
  - Upgrading MapR Expansion Packs
    Describes how to upgrade MapR Expansion Packs (MEP), either as part of a MapR Core upgrade or to take advantage of a new MEP for the current version of MapR Core.
- Migrating to MapR
  Provides instructions for migrating business-critical data and applications from an Apache Hadoop cluster to a MapR cluster.
- Applying a Patch
  You can apply a patch by using the MapR Installer, by using the command line (a manual process), or by using a MapR Installer Stanza.

Step 5: Update Hadoop Configuration File

When manually upgrading (manual offline and manual rolling upgrade) from version 4.x to version 5.x and switching from classic mode to YARN mode, you must manually update the Hadoop configuration file.

About this task

This task is applicable if you are upgrading from any version of 4.x to any version of 5.x and also switching from classic mode to YARN mode. In addition, this step is applicable for only the manual offline upgrade and the manual rolling upgrade. This step is not applicable when using the MapR Installer or the scripted rolling upgrade method.

Procedure

Change directory to /opt/mapr/conf directory.
```
cd /opt/mapr/conf/
```
Edit the Hadoop configuration file
```
vim hadoop_version
```
Change the yarn_version parameter to the actual version of Hadoop. For example:
```
yarn_version=2.7.0
```