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## Package org.apache.hadoop.util

Common utilities.

See:
Description

Interface Summary
IndexedSortable | Interface for collections capable of being sorted by `IndexedSorter` algorithms.
IndexedSorter | Interface for sort algorithms accepting `IndexedSortable` items.
Progressable | A facility for reporting progress.
Tool | A tool interface that supports handling of generic command-line options.

Class Summary
ChecksumUtil |
CyclicIteration<K,V> | Provide an cyclic `Iterator` for a `NavigableMap`.
Daemon | A thread that has called `Thread.setDaemon(boolean)` with true.
DataChecksum | This class provides inteface and utilities for processing checksums for DFS data transfers.
DiskChecker | Class that provides utility functions for checking disk problem
GenericOptionsParser | `GenericOptionsParser` is a utility to parse command line arguments generic to the Hadoop framework.
GenericsUtil | Contains utility methods for dealing with Java Generics.
HeapSort | An implementation of the core algorithm of HeapSort.
HostsFileReader |
LineReader | A class that provides a line reader from an input stream.
LinuxMemoryCalculatorPlugin | Deprecated. Use `LinuxResourceCalculatorPlugin` instead
LinuxResourceCalculatorPlugin | Plugin to calculate resource information on Linux systems.
MemoryCalculatorPlugin | Deprecated. Use `ResourceCalculatorPlugin` instead
MergeSort | An implementation of the core algorithm of MergeSort.
NativeCodeLoader | A helper to load the native hadoop code i.e.
PlatformName | A helper class for getting build-info of the java-vm.
PrintJarMainClass | A micro-application that prints the main class name out of a jar file.
PriorityQueue<T> | A PriorityQueue maintains a partial ordering of its elements such that the least element can always be found in constant time.
ProcessTree | Process tree related operations
ProcfsBasedProcessTree | A Proc file-system based ProcessTree.
ProgramDriver | A driver that is used to run programs added to it
Progress | Utility to assist with generation of progress reports.
QueueProcessingStatistics | Hadoop has several work queues, such as `FSNamesystem.neededReplications` With a properly throttled queue, a worker thread cycles repeatedly, doing a chunk of work each cycle then resting a bit, until the queue is empty.
QuickSort | An implementation of the core algorithm of QuickSort.
ReflectionUtils | General reflection utils
ResourceCalculatorPlugin | Plugin to calculate resource information on the system.
ResourceCalculatorPlugin.ProcResourceValues |
RunJar | Run a Hadoop job jar.
ServletUtil |
Shell | A base class for running a Unix command.
Shell.ShellCommandExecutor | A simple shell command executor.
StringUtils | General string utils
ToolRunner | A utility to help run `Tool`s.
UTF8ByteArrayUtils |
VersionInfo | This class finds the package info for Hadoop and the HadoopVersionAnnotation information.
XMLUtils | General xml utilities.

Enum Summary
ProcessTree.Signal | The constants for the signals.
QueueProcessingStatistics.State | This enum provides the "states" of a state machine for `QueueProcessingStatistics`.
StringUtils.TraditionalBinaryPrefix | The traditional binary prefixes, kilo, mega, ..., exa, which can be represented by a 64-bit integer.

Exception Summary
DiskChecker.DiskErrorException |
DiskChecker.DiskOutOfSpaceException |
Shell.ExitCodeException | This is an IOException with exit code added.

## Package org.apache.hadoop.util Description

Common utilities.

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