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Package org.apache.hadoop.util

Added Classes and Interfaces
AsyncDiskService  
ChecksumUtil  
MRAsyncDiskService This class is a container of multiple thread pools each for a volume so that we can schedule async disk operations easily.
PluginDispatcher Provides convenience functions for dispatching calls through to plugins registered with a class.
ProcessTree Process tree related operations
PureJavaCrc32 A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32.
ServicePlugin Service plug-in interface.
SingleArgumentRunnable Simple interface for a Runnable that takes a single argument.
 

Changed Classes
DiskChecker Class that provides utility functions for checking disk problem
HostsFileReader  
ProcfsBasedProcessTree A Proc file-system based ProcessTree.
RunJar Run a Hadoop job jar.
Shell A base class for running a Unix command.
Shell.ShellCommandExecutor A simple shell command executor.
StringUtils General string utils
VersionInfo This class finds the package info for Hadoop and the HadoopVersionAnnotation information.