Package org.apache.hadoop.util

Common utilities.

See:
Description

Interface Summary

Progressable	A facility for reporting progress.
Tool	A tool interface that supports handling of generic command-line options.

Class Summary

Options	This class allows generic access to variable length type-safe parameter lists.
Options.BooleanOption
Options.ClassOption
Options.FSDataInputStreamOption
Options.FSDataOutputStreamOption
Options.IntegerOption
Options.LongOption
Options.PathOption
Options.ProgressableOption
Options.StringOption
ProtoUtil
PureJavaCrc32	A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32.
PureJavaCrc32C	A pure-java implementation of the CRC32 checksum that uses the CRC32-C polynomial, the same polynomial used by iSCSI and implemented on many Intel chipsets supporting SSE4.2.
ReflectionUtils	General reflection utils
Shell.ShellCommandExecutor	A simple shell command executor.
ShutdownHookManager	The ShutdownHookManager enables running shutdownHook in a deterministic order, higher priority first.
StringInterner	Provides equivalent behavior to String.intern() to optimize performance, whereby does not consume memory in the permanent generation.
ToolRunner	A utility to help run Tools.

Enum Summary

DataChecksum.Type	The checksum types
StringUtils.TraditionalBinaryPrefix	The traditional binary prefixes, kilo, mega, ..., exa, which can be represented by a 64-bit integer.

Exception Summary

DiskChecker.DiskErrorException
DiskChecker.DiskOutOfSpaceException
ExitUtil.ExitException
Shell.ExitCodeException	This is an IOException with exit code added.

Package org.apache.hadoop.util Description

Common utilities.