This site contains release notes for MapR Version 5.0 and below.  You can also refer to the release notes for the latest release.

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New In This Release

  • Feature: MapR-FS now provides native storage for table data. Tables are accessible via HBase shell and HBase Java APIs, as well as through the maprcli command-line APIs and the MapR Control System (MCS). With natively stored table data, tables can benefit from snapshots, mirroring, and high availability in the same way as flat files. MapR's implementation of HBase automatically handles splits and compactions, in addition to supporting up to 64 column families for increased schema flexibility. Since MapR tables are implemented directly within MapR-FS, which is written in C and optimized for performance, natively stored MapR tables offer a significant performance increase over JVM-based Apache HBase.
    MapR tables require no region servers, additional processes, or redundant layers between the application and the data in the cluster. The architecture for MapR tables provides automatic region splits and self-tuning with no downtime required for any operation including schema changes.
    See M7 - Native Storage for MapR Tables for complete documentation on this new feature.
  • Feature: MapR on the Amazon Elastic MapReduce (EMR) cloud now supports multiple versions of the MapR distribution for Hadoop, including version 3.0.
  • Feature: The user interface for the MCS has been upgraded, with new features for increased ease of use and quicker access to cluster information. See the documentation for more information.
  • Change: The default value for the service.command.mfs.heapsize.percent attribute in the warden.conf configuration file has changed from 20 to 35.
  • Change: The MapR installation process no longer requires sudo privileges, except on SUSE (see Known Issue 10299).

Licensing

To evaluate or acquire a license for the M7 Edition of the MapR enterprise-grade platform for Hadoop, please register at http://www.mapr.com/products/register-now-mapr-m7. You cannot license an M7 cluster by using the Add Licenses via Web button in the MCS Manage Licenses dialog.

Resolved Issues

Resolved issues are listed in the sections below.

General

  • (Issue 9288) Improved fileclient and hoststats service stability.
  • (Issue 9349) Webserver for the MapR Control System now restarts correctly in low-memory conditions.
  • (Issue 9706) Name resolution is now case-insensitive.
  • (Issue 9754) The mrconfig info mapruidmismatch command now checks with the active/heartbeating node.
  • (Issue 10052) The default value of the fs.mapr.hbase.flushonread attribute is now False.
  • (Issue 10102) MapRClient class now loads only once when Datameer starts.

JobTracker

  • (Issue 10282) The main JobClient thread no longer waits for the thread pool to time out after completing.

NFS

  • (Issue 9923) GetData errors in NFS writes now handled correctly.

Filesystem

  • (Issue 9753) You can now add the entry 8200 string MAPR MapR FileSystem to your /etc/magic file to properly identify MapR filesystems.

Known Issues

(Issue 7844)

High startup time on nodes with large numbers of containers.

(Issue 10255)

Release 3.0 only supports 64-bit clients.

(Issue 10261)

HiveServer2 is not supported in this release.

(Issue 10299)

Sudoless installation is not supported on SUSE.

(Issue 10598)

When a node's IP number is reassigned to another node, remote procedure calls are misdirected to the wrong node. This can result in widespread errors affecting any system that use the RPC binding layer, including container resync operations that never finish or the creation of several superfluous containers. Restart the cluster to clear this condition.

(Issue 11389)

If you use the latest version of any browser to view the MCS, the CLDB, HBase, JobTracker, and job log pages do not load when you click on the respective links. As a workaround, use the following instructions to disable mixed-content-blocking in your browser:
Internet Explorer
Scroll to the bottom of the screen, and click Show all content. The page refreshes and displays mixed content. 

Mozilla Firefox

  1. At the top of the page, to the left of the address bar, click  (the shield icon).
  2. In the pop-up window that appears, click the down arrow next to "Keep Blocking", and select Disable Protection on This Page. The page refreshes and displays mixed content. The shield icon is replaced with a warning symbol to indicate that the page is displaying both secure and non-secure items.

Google Chrome

  1. Click  (the shield icon) on the right side of the address bar.
  2. In the icon dialog box, click Load anyway. The page refreshes and displays mixed content. The URL in the address bar shows https crossed out to indicate that the page is displaying both secure and non-secure items.

Deprecated Features

rollingupgrade.sh

Automatic rolling upgrades are no longer supported. As a result, the rollingupgrade.sh script has been removed from this release of the MapR distribution for Hadoop.

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