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6.0 Installation
This section contains information about installing and upgrading MapR software. It also contains information about how to migrate 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.
Special Considerations for MCS Patches
Patches for the MapR Control System (MCS) are handled differently from patches for MapR data nodes and CLDB nodes.

MapR 6.0 Documentation

6.0 Installation
This section contains information about installing and upgrading MapR software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
- Planning the Cluster
  Describes information and factors used in planning your cluster.
- Installing MapR and/or MapR Ecosystem Components
  Describes how to install MapR software and ecosystem components with the MapR Installer or without the MapR Installer.
- Installing the File Migration Service on the Edge Cluster
- Installing MapR-XD
  Describes how to install MapR-XD software with or without the MapR Installer.
- Installing MapR Data Fabric for Kubernetes
  This section describes how to plan for, install, and upgrade the MapR Container Storage Interface (CSI) Storage Plugin and MapR Data Fabric for Kubernetes FlexVolume Driver.
- Installing MapR in the Cloud
  Provides an overview of MapR cloud installer capabilities.
- Upgrading MapR Core 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.
- Setting Up Clients
  Describes how to set up and use interfaces to a MapR cluster from a client computer.
- Setting Up the MapR Control System
  Describes how to configure and access the MapR Control System (MCS).
- 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.
  - Applying a Patch Using the MapR Installer
    The MapR Installer automates much of the work involved in applying MapR patches.
  - Applying a Patch Manually
    MapR patches are version-specific and cumulative. Each patch contains the code fixes that were included in the previous patch for that MapR version.
  - Applying a Patch Using a MapR Installer Stanza
    Applying a patch using a MapR Installer Stanza leverages the automation provided by the patch-install capability of the web-based MapR Installer.
  - Rolling Back a Patch
    Removing a previously installed patch must be done manually. Alternatively, you can revert to a previous version of the patch by installing over a newer version. To minimize the impact of this change on your cluster, contact MapR Support for technical assistance.
  - Special Considerations for MCS Patches
    Patches for the MapR Control System (MCS) are handled differently from patches for MapR data nodes and CLDB nodes.
  - Special Considerations for FUSE POSIX Patches
    Patches for some features, such as the FUSE POSIX client, can require post-installation steps.

Special Considerations for MCS Patches

Patches for the MapR Control System (MCS) are handled differently from patches for MapR data nodes and CLDB nodes.

MCS software is updated as a package rather than a patch file. While MapR Core patches typically include a prefix such as mapr-patch or mapr-patch-client, or mapr-patch-posix-client-basic, MCS software is updated as a new package and does not use the MapR Core patch mechanism.

To identify an MCS patch package, look for mapr-apiserver or mapr-webserver in the package name, and use these steps to update your currently installed packages:

Stop the apiserver service on all MCS nodes:

$ maprcli node services -filter [csvc==apiserver] -name apiserver -action stop

Upgrade the existing mapr-apiserver and mapr-webserver packages. For example:

On CentOS/Redhat or SUSE:

$ rpm -Uvh <path to new mapr-apiserver>
$ rpm -Uvh <path to new mapr-webserver>

On Ubuntu:

$ dpkg -i <path to new mapr-apiserver>
$ dpkg -i <path to new mapr-webserver>

Run configure.sh to update the configuration for the new packages:
```
$ /opt/mapr/server/configure.sh -R --noRecalcMem
```

Start the apiserver service on all MCS nodes:

$ maprcli node services -filter [csvc==apiserver] -name apiserver -action start

(Topic last modified: 2019-01-25)