This is the documentation for CDH 4.6.0.
Documentation for other versions is available at Cloudera Documentation.

What's New in CDH4.0.0

CDH-wide changes in CDH4.0.0

  • Ubuntu 10.04 (LTS) and 12.04 (LTS) 64-bit support

Apache Hadoop MapReduce

  • Various bug fixes, Web UI and other enhancements.

Apache Flume

  • New HBase sink
  • New durable file-based channel
  • Support for Interceptors, plugins to transform events inline
  • Avro output format support in HDFS sink
  • Major improvements to syslog TCP and UDP sources
  • Support for custom sink processors
  • Load balancing support
  • Support for writing to HDFS as multiple users when running under Kerberos
  • Improved legacy source support for Flume 0.9.x compatibility
  • Over 30 bug fixes

Apache HBase

  • Supports replication between clusters in different geographies (HBASE-1295)

Apache Hive

New Features:

Hue

  • An on/off switch has been added to either restrict access to the personal jobs of the user or keep all the jobs accessible to everybody (previous behavior).
  • A switch has been added to Beeswax to restrict other users' access to personal saved queries (HUE-688, HUE-701).

Apache Oozie

  • Bundled jobs allow you to manage multiple coordinator jobs as a single job.
  • Support for proxy users, user impersonation.
  • New sharelib implementation, one per action type.
  • Database creation tool.
  • CLI, Java API, and REST API improvements.
  • Several scalability and stability improvements.
  • Several bug fixes.