from: http://www.cloudera.com/blog/2008/12/whats-new-in-hadoop-core-019/
What’s New in Hadoop Core 0.19
by Tom White
December 31, 2008
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The first release (0.19.0) from the 0.19 branch of Hadoop Core was made on November 24. Many changes go into a release like this, and it can be difficult to get a feel for the more significant ones, even with the detailed Jira log, change log, and release notes. (There’s also JDiff documentation, which is a great way to see how the public API changed, via a JavaDoc-like interface.) This post gives a high-level feel for what’s new.