Package org.apache.hadoop.util

Common utilities.

See:
Description

Interface Summary

IdentityHashStore.Visitor<K,V>
IPList
LightWeightCache.Entry	Entries of LightWeightCache.
LightWeightGSet.LinkedElement	Elements of LightWeightGSet.
Progressable	A facility for reporting progress.
Shell.CommandExecutor
Tool	A tool interface that supports handling of generic command-line options.

Class Summary

ApplicationClassLoader	A URLClassLoader for application isolation.
CacheableIPList	CacheableIPList loads a list of subnets from a file.
CloseableReferenceCount	A closeable object that maintains a reference count.
CombinedIPWhiteList
ComparableVersion	Generic implementation of version comparison.
FileBasedIPList	FileBasedIPList loads a list of subnets in CIDR format and ip addresses from a file.
LimitInputStream	Copied from guava source code v15 (LimitedInputStream) Guava deprecated LimitInputStream in v14 and removed it in v15.
MachineList	Container class which holds a list of ip/host addresses and answers membership queries.
MachineList.InetAddressFactory	InetAddressFactory is used to obtain InetAddress from host.
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
PerformanceAdvisory
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.
ShutdownThreadsHelper	Helper class to shutdown Threads and ExecutorServices.
StringInterner	Provides equivalent behavior to String.intern() to optimize performance, whereby does not consume memory in the permanent generation.
ThreadUtil
ToolRunner	A utility to help run Tools.
Waitable<T>	Represents an object that you can wait for.

Enum Summary

DataChecksum.Type	The checksum types
Shell.OSType
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
ExitUtil.HaltException
Shell.ExitCodeException	This is an IOException with exit code added.

Package org.apache.hadoop.util Description

Common utilities.