0.22 Release and Security

[Praveen Sripati]

Hi,

The release notes for 0.22 (
http://hadoop.apache.org/common/releases.html#10+December%2C+2011%3A+release+0.22.0+available)
it says

>The following features are not supported in Hadoop 0.22.0.

    >Security.
    >Latest optimizations of the MapReduce framework introduced in the
Hadoop 0.20.security line of releases.
    >Disk-fail-in-place.
    >JMX-based metrics v2.

By Security missing, what all features are missing? Does it mean Kerberos
integration is missing?

In o.a.h.hdfs.server.datanode.SecureDataNodeStarter.java, the following
code is there

    if(!conf.get(HADOOP_SECURITY_AUTHENTICATION).equals("kerberos"))
      throw new RuntimeException("Cannot start secure datanode in unsecure
cluster");

Regards,
Praveen