Package org.apache.hadoop.hbase.util

Interface Summary

Interface	Description
Addressing.AddressSelectionCondition	Interface for AddressSelectionCondition to check if address is acceptable
AvlUtil.AvlInsertOrReplace<TNode extends AvlUtil.AvlNode>
AvlUtil.AvlKeyComparator<TNode extends AvlUtil.AvlNode>	The AvlTree allows to lookup an object using a custom key.
AvlUtil.AvlNodeVisitor<TNode extends AvlUtil.AvlNode>	Visitor that allows to traverse a set of AvlNodes.
ByteBufferAllocator	Defines the way the ByteBuffers are created
ByteRange	Lightweight, reusable class for specifying ranges of byte[]'s.
ConcurrentMapUtils.IOExceptionSupplier<V>	A supplier that throws IOException when get.
EnvironmentEdge	Has some basic interaction with the environment.
ObjectPool.ObjectFactory<K,V>	An ObjectFactory object is used to create new shared objects on demand.
PositionedByteRange	Extends ByteRange with additional methods to support tracking a consumers position within the viewport.
TimeMeasurable<T>	Methods that implement this interface can be measured elapsed time.

Class Summary

Class	Description
AbstractByteRange	An abstract implementation of the ByteRange API
AbstractHBaseTool	Common base class used for HBase command-line tools.
AbstractPositionedByteRange	Extends the basic SimpleByteRange implementation with position support.
Addressing	Utility for network addresses, resolving and naming.
AtomicUtils	Utilities related to atomic operations.
AvlUtil	Helper class that allows to create and manipulate an AvlTree.
AvlUtil.AvlIterableList	Helper class that allows to create and manipulate a linked list of AvlLinkedNodes
AvlUtil.AvlLinkedNode<TNode extends AvlUtil.AvlLinkedNode>	This class extends the AvlNode and adds two links that will be used in conjunction with the AvlIterableList class.
AvlUtil.AvlNode<TNode extends AvlUtil.AvlNode>	This class represent a node that will be used in an AvlTree.
AvlUtil.AvlTree	Helper class that allows to create and manipulate an AVL Tree
AvlUtil.AvlTreeIterator<TNode extends AvlUtil.AvlNode>	Iterator for the AvlTree
BoundedCompletionService<V>	A completion service, close to the one available in the JDK 1.7 However, this ones keeps the list of the future, and allows to cancel them all.
ByteArrayHashKey
ByteBufferArray	This class manages an array of ByteBuffers with a default size 4MB.
ByteBufferUtils	Deprecated This class will become IA.Private in HBase 3.0.
ByteRangeUtils	Utility methods for working with ByteRange.
Bytes	Utility class that handles byte arrays, conversions to/from other types, comparisons, hash code generation, manufacturing keys for HashMaps or HashSets, and can be used as key in maps or trees.
Bytes.ByteArrayComparator	Byte array comparator class.
Bytes.RowEndKeyComparator	A Bytes.ByteArrayComparator that treats the empty array as the largest value.
CellHashKey	Extracts the byte for the hash calculation from the given cell
Classes	Utilities for class manipulation.
ClassLoaderBase	Base class loader that defines couple shared constants used by sub-classes.
ClassSize	Class for determining the "size" of a class, an attempt to calculate the actual bytes that an object of this class will occupy in memory The core of this class is taken from the Derby project
CollectionUtils	Deprecated Since 2.0.6/2.1.3/2.2.0
CommonFSUtils	Utility methods for interacting with the underlying file system.
ConcatenatedLists<T>	A collection class that contains multiple sub-lists, which allows us to not copy lists.
ConcurrentMapUtils	Utility methods for dealing with Collections, including treating null collections as empty.
CoprocessorClassLoader	ClassLoader used to load classes for Coprocessor instances.
Counter	Deprecated since 2.0.0 and will be removed in 3.0.0.
DefaultEnvironmentEdge	Default implementation of an environment edge.
DNS	Wrapper around Hadoop's DNS class to hide reflection.
DynamicClassLoader	This is a class loader that can load classes dynamically from new jar files under a configured folder.
EnvironmentEdgeManager	Manages a singleton instance of the environment edge.
ExceptionUtil	This class handles the different interruption classes.
ExponentialMovingAverage	EMA is similar to WeightedMovingAverage in weighted, but the weighting factor decrease exponentially.
FutureUtils	Helper class for processing futures.
GsonUtil	Helper class for gson.
Hash	This class represents a common API for hashing functions.
HashKey<T>	Used to calculate the hash Hash algorithms for Bloomfilters.
IdLock	Allows multiple concurrent clients to lock on a numeric id with a minimal memory overhead.
IdLock.Entry	An entry returned to the client as a lock object
ImmutableByteArray	Mainly used as keys for HashMap.
IncrementingEnvironmentEdge	Uses an incrementing algorithm instead of the default.
JenkinsHash	Produces 32-bit hash for hash table lookup.
JRubyFormat	Utility class for converting objects to JRuby.
JVM	This class is a wrapper for the implementation of com.sun.management.UnixOperatingSystemMXBean It will decide to use the sun api or its own implementation depending on the runtime (vendor) used.
KeyLocker<K>	A utility class to manage a set of locks.
MD5Hash	Utility class for MD5 MD5 hash produces a 128-bit digest.
Methods
MovingAverage<T>	The purpose of introduction of MovingAverage mainly is to measure execution time of a specific method, which can help us to know its performance fluctuation in response to different machine states or situations, better case, then to act accordingly.
MurmurHash	This is a very fast, non-cryptographic hash suitable for general hash-based lookup.
MurmurHash3	This is a very fast, non-cryptographic hash suitable for general hash-based lookup.
NonceKey	This implementation is not smart and just treats nonce group and nonce as random bits.
ObjectIntPair<T>	A generic class for pair of an Object and and a primitive int value.
ObjectPool<K,V>	A thread-safe shared object pool in which object creation is expected to be lightweight, and the objects may be excessively created and discarded.
OrderedBytes	Utility class that handles ordered byte arrays.
Pair<T1,T2>	A generic class for pairs.
PairOfSameType<T>	A generic, immutable class for pairs of objects both of type T.
PrettyPrinter
Random64	An instance of this class is used to generate a stream of pseudorandom numbers.
ReflectionUtils
RetryCounter	Operation retry accounting.
RetryCounter.BackoffPolicy	Policy for calculating sleeping intervals between retry attempts
RetryCounter.ExponentialBackoffPolicy
RetryCounter.ExponentialBackoffPolicyWithLimit
RetryCounter.RetryConfig	Configuration for a retry counter
RetryCounterFactory
RowBloomHashKey
RowColBloomHashKey	An hash key for ROWCOL bloom.
SimpleByteRange	A read only version of the ByteRange.
SimpleMovingAverage	SMA measure the overall average execution time of a specific method.
SimpleMutableByteRange	A basic mutable ByteRange implementation.
SimplePositionedByteRange	Extends the basic SimpleMutableByteRange implementation with position support and it is a readonly version.
SimplePositionedMutableByteRange	Extends the basic AbstractPositionedByteRange implementation with position support and it is a mutable version.
Sleeper	Sleeper for current thread.
SoftObjectPool<K,V>	A SoftReference based shared object pool.
Strings	Utility for Strings.
Threads	Thread Utility
Triple<A,B,C>	Utility class to manage a triple.
UnsafeAccess
VersionInfo	This class finds the Version information for HBase.
WeakObjectPool<K,V>	A WeakReference based shared object pool.
WeightedMovingAverage	Different from SMA SimpleMovingAverage, WeightedMovingAverage gives each data different weight.
WindowMovingAverage	Instead of calculate a whole time average, this class focus on the last N.

Enum Summary

Enum	Description
ChecksumType	Checksum types.
DNS.ServerType
Order	Used to describe or modify the lexicographical sort order of a byte[].
PrettyPrinter.Unit

Exception Summary

Exception	Description
CommonFSUtils.StreamLacksCapabilityException	Helper exception for those cases where the place where we need to check a stream capability is not where we have the needed context to explain the impact and mitigation for a lack.
ReadOnlyByteRangeException	Exception thrown when a read only byte range is modified