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

  • New Feature: MapR now supports TRIM operations for SSD storage. TRIM operations convey information about which blocks on an SSD device are no longer in use and can be safely wiped, reducing the number of write cycles and prolonging the life of the device. Set the value of the mfs.ssd.trim.enabled parameter to 1 in the mfs.conf file to enable support for TRIM operations. Restart the FileServer after making changes to the mfs.conf file.
  • New Feature: Impersonation for the JobTracker and TaskTracker Hadoop components is now supported. By using impersonation, a Hadoop component behaves as a user other than the user who launched the process, which on a MapR cluster is typically the user mapr. By supporting impersonation, processes that create files or tables can create those objects as another user on the system. By default, impersonation is only supported for the user specified in the MAPR_USER environment variable. To enable impersonation for other users, log in as root and create a file in $MAPR_HOME/conf/proxy with the same name as the user.

Resolved Issues

Resolved issues are listed in the sections below.

General

  • (Issue 11146) Upgrades from version 2.1.3 to 3.0.2 set the correct permissions for the NFS binary. The NFS server now starts normally after the upgrade.
  • (Issue 11774) On Windows clients, the timeout handling for remote procedure calls (RPCs) used by FileClient and other services resulted in failed RPCs not timing out or retrying. The handling has been modified to correctly time out and then retry the failed call.
  • (Issue 11479) Java programs can now gain MapR client functionality without installing the MapR client by using the MapRFileSystem fileSystem constructor.
  • (Issue 11863) A cluster running MapReduce can now write data into tables in a separate M7 cluster. 

MapR Tables

  • (Issue 11599) MapR tables that shrink in size now reallocate storage more efficiently.
  • (Issue 11764) MapR tables are closed only when all scanner objects that were created from that table are closed, addressing a crash related to accessing freed memory.
  • (Issue 11754) Workloads that use a large number of simultaneous row locks on MapR tables have increased performance.
  • (Issue 11738) Fixes a race condition where multiple attempts to recover a portion of a table occur simultaneously.

MapReduce

  • (Issue 11146) Upgrading now sets permissions for /opt/mapr/server/maprexecute correctly.
  • (Issue 11528) Resolved a null pointer exception caused by the Fair Scheduler attempting to preempt a task belonging to a completed job.
  • (Issue 11530) The Job History display page correctly ignores files unrelated to job history when assembling job history information.

Fileserver

  • (Issue 11602) MapR-FS now supports up to 512 disks on a node.

CLDB

  • (Issue 11619) The MapR distribution for Hadoop now supports hostnames over 48 characters in length, increasing support for virtual-machine environments.

NFS

  • (Issue 11406) Changes to how NFS reads and writes to local disk increases performance up to 2x.
  • (Issue 11434) The NFS server has been updated to work with users that belong to more than 16 groups.
  • (Issue 11643) You can now create Virtual IP addresses across the boundary of a class C address. These virtual IP addresses can be separated by more than 8 bits.

MapReduce and Hadoop Patches Integrated Since Last Release

MapR 3.0.2 includes the following Apache MapReduce and Apache Hadoop patches:

  • [MAPREDUCE-4706] Fixes FairScheduler event log dumps to include meaningful information about currently running map and reduce jobs.

Known Issues

(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.

Server Configuration Support

Operating System

Version

Binary Type

JDK

HBase

Hive

Flume

Sqoop

HCatalog* (For Hive 0.9 and 0.10)

Mahout

Oozie

Pig

Whirr

Cascading

Redhat Enterprise Linux

5.7
5.8
5.9
6.0
6.1
6.2
6.3
6.4

64-bit

Oracle JDK 1.6
Oracle JDK 1.7
Open JDK 1.6
Open JDK 1.7

92.2
94.9

0.9
0.10 (HS2)
0.11 (HS2)

1.4.0

1.4.4

0.4

0.7
0.8

3.3.2

0.11

0.8.1

2.1

CentOS

5.7
5.8
5.9
6.0
6.1
6.2
6.3
6.4

64-bit

Oracle JDK 1.6
Oracle JDK 1.7
Open JDK 1.6
Open JDK 1.7

92.2
94.9

0.9
0.10 (HS2)
0.11 (HS2)

1.4.0

1.4.4

0.4

0.7
0.8

3.3.2

0.11

0.8.1

2.1

Suse Linux Enterprise Server

11 SP1
11 SP2

64-bit

Oracle JDK 1.6
Oracle JDK 1.7
Open JDK 1.6
Open JDK 1.7

92.2
94.9

0.9
0.10 (HS2)
0.11 (HS2)

1.4.0

1.4.4

0.4

0.7
0.8

3.3.2

0.11

0.8.1

2.1

Ubuntu

9.04
9.10
10.04
10.10
11.04
11.10
12.04

64-bit

Oracle JDK 1.6
Oracle JDK 1.7
Open JDK 1.6
Open JDK 1.7

92.2
94.9

0.9
0.10 (HS2)
0.11 (HS2)

1.4.0

1.4.4

0.4

0.7
0.8

3.3.2

0.11

0.8.1

2.1

Amazon EMR

 

64-bit

Oracle JDK 1.6
Oracle JDK 1.7
Open JDK 1.6
Open JDK 1.7

92.2
94.9

0.9
0.10 (HS2)
0.11 (HS2)

1.4.0

1.4.4

0.4

0.7
0.8

3.3.2

0.11

0.8.1

2.1

  • HCatalog and WebHCat are included in Hive as of version 0.11

Client Configuration Support

Operating System

Version

Binary Type

Windows

7, 2008, v8

32bit

Windows

7, 2008, v8

64bit

Linux

Server Version

64bit

Mac OS X

10.8.2

64bit

Browser Support

Browser

Version

Firefox

19

IE

10

Chrome

26+

Safari

6.0.2

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