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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.
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.

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.
    - Step 1: Verify Cluster Readiness for a Patch
      Before you apply a patch, check that the cluster is ready for a patch to be applied. In addition to the prerequisites, consider verifying that the cluster utilizes best practices which will facilitate a more optimal patch installation.
    - Step 2: Apply the Patch to Data Nodes
      When applying a patch manually, apply the patch to nodes dedicated to storing and processing data prior to applying the patch on nodes that run the CLDB. This includes nodes that run the Fileserver for storage and processing components such as the Node Manager and the HBase client.
    - Step 3: Apply the Patch to CLDB Nodes
      When applying a patch manually, apply the patch to CLDB slave nodes prior to applying the patch on the master CLDB node. After you apply a patch to a CLDB node, you must verify that container 1 is fully replicated before proceeding to apply the patch to the next CLDB node.
  - 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.

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.

Before applying a patch, note these considerations:

For patch-download information, see Applying a Patch.
The steps for patching the MapR Control System (MCS) are different from the steps for patching MapR Core. See Special Considerations for MCS Patches.
You can also apply a patch using the MapR Installer. See Applying a Patch Using the MapR Installer.
A patch for a given software version can be removed, and an older patch for the same MapR software version can be installed. However, rolling back a cluster from a newer MapR version to an older version is not supported.

Applying a patch is a three-step process:

When you apply a patch to the cluster, the patched files along with original files (non-patched) are copied to the /opt/mapr/.patch folder. In the /opt/mapr/.patch folder, the file ending with .O is the original file (non-patched) and the file ending with .<patch_number> is the patched version. Therefore, if there is a file under /opt/mapr/.patch/lib/, you can compare that with the corresponding file under /opt/mapr/lib/ by using the md5sum command to verify that the patch was successfully deployed.

If you need more information or if you encounter any problems with patch installation, contact support@mapr.com.

(Topic last modified: 2019-01-25)