Apache Hadoop 0.17.2 Release Notes

These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.

Fix a bug with HDFS file close() mistakenly introduced by HADOOP-3681.

NameNode keeps a count of number of blocks scheduled to be written to a datanode and uses it to avoid allocating more blocks than a datanode can hold.

Avoid spurious exceptions logged at DataNode when clients read from DFS.

Allows the user to change the maximum number of xceivers in the datanode.