Applying a Patch

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 version-specific patches are available here:

Applying a patch is a 3 step process:

Step 1: Verify Cluster Readiness for a Patch Step 2: Apply the Patch to Data Nodes Step 3: Apply the Patch to CLDB Nodes

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.

Note: 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
For information on the bugs fixed in the patch:
  • Go to the MapR Customer Support web portal at After logging into the portal, click the "Patches" tab and choose the appropriate MapR version to view the list of bug fixes. You will then see the patch name for the fixes displayed.
  • View a copy of the latest Patch Release Notes.

Contact if you need more information or if you face any problems with patch installation.