Package org.apache.hadoop.hbase.util

Interface Summary

Interface	Description
BloomFilter	Implements a Bloom filter, as defined by Bloom in 1970.
BloomFilterBase	Common methods Bloom filter methods required at read and write time.
BloomFilterWriter	Specifies methods needed to add elements to a Bloom filter and serialize the resulting Bloom filter as a sequence of bytes.
CancelableProgressable	Similar interface as Progressable but returns a boolean to support canceling the operation.
FileStatusFilter
FSVisitor.StoreFileVisitor
HBaseFsck.ErrorReporter
JSONBean.Writer	Use dumping out mbeans as JSON.
KeyRange	A key range use in split coverage.
ModifyRegionUtils.RegionEditTask
ModifyRegionUtils.RegionFillTask
RegionSplitter.SplitAlgorithm	A generic interface for the RegionSplitter code to use for all it's functionality.

Class Summary

Class	Description
AbstractFileStatusFilter	Typical base class for file status filter.
BloomContext	The bloom context that is used by the StorefileWriter to add the bloom details per cell
BloomFilterChunk	The basic building block for the CompoundBloomFilter
BloomFilterFactory	Handles Bloom filter initialization based on configuration and serialized metadata in the reader and writer of StoreFile.
BloomFilterUtil	Utility methods related to BloomFilters
BoundedPriorityBlockingQueue<E>	A generic bounded blocking Priority-Queue.
CollectionBackedScanner	Utility scanner that wraps a sortable collection and serves as a KeyValueScanner.
CompressionTest	Compression validation test.
ConfigurationUtil	Utilities for storing more complex collection types in Configuration instances.
ConnectionCache	A utility to store user specific HConnections in memory.
DirectMemoryUtils	Utilities for interacting with and monitoring DirectByteBuffer allocations.
EncryptionTest
FSHDFSUtils	Implementation for hdfs
FSMapRUtils	MapR implementation.
FSTableDescriptors	Implementation of TableDescriptors that reads descriptors from the passed filesystem.
FSUtils	Utility methods for interacting with the underlying file system.
FSUtils.BlackListDirFilter	Directory filter that doesn't include any of the directories in the specified blacklist
FSUtils.DirFilter	A PathFilter that only allows directories.
FSUtils.FamilyDirFilter	Filter for all dirs that are legal column family names.
FSUtils.HFileFilter	Filter for HFiles that excludes reference files.
FSUtils.HFileLinkFilter	Filter for HFileLinks (StoreFiles and HFiles not included).
FSUtils.ReferenceFileFilter
FSUtils.RegionDirFilter	Filter for all dirs that don't start with '.'
FSUtils.UserTableDirFilter	A PathFilter that returns usertable directories.
FSVisitor	Utility methods for interacting with the hbase.root file system.
GetJavaProperty	A generic way for querying Java properties.
HashedBytes	This class encapsulates a byte array and overrides hashCode and equals so that it's identity is based on the data rather than the array instance.
HBaseConfTool	Tool that prints out a configuration.
HBaseFsck	HBaseFsck (hbck) is a tool for checking and repairing region consistency and table integrity problems in a corrupted HBase.
HBaseFsck.HbckInfo	Maintain information about a particular region.
HBaseFsckRepair	This class contains helper methods that repair parts of hbase's filesystem contents.
HFileArchiveUtil	Helper class for all utilities related to archival/retrieval of HFiles
HttpServerUtil	HttpServer utility.
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
IdReadWriteLock	Allows multiple concurrent clients to lock on a numeric id with ReentrantReadWriteLock.
JSONBean	Utility for doing JSON and MBeans.
JSONMetricUtil
JVMClusterUtil	Utility used running a cluster all in the one JVM.
JVMClusterUtil.MasterThread	Datastructure to hold Master Thread and Master instance
JVMClusterUtil.RegionServerThread	Datastructure to hold RegionServer Thread and RegionServer instance
JvmPauseMonitor	Class which sets up a simple thread which runs in a loop sleeping for a short interval of time.
JvmVersion	Certain JVM versions are known to be unstable with HBase.
ManualEnvironmentEdge	An environment edge that uses a manually set value.
ModifyRegionUtils	Utility methods for interacting with the regions.
MultiHConnection	Provides ability to create multiple Connection instances and allows to process a batch of actions using CHTable.doBatchWithCallback()
MunkresAssignment	Computes the optimal (minimal cost) assignment of jobs to workers (or other analogous) concepts given a cost matrix of each pair of job and worker, using the algorithm by James Munkres in "Algorithms for the Assignment and Transportation Problems", with additional optimizations as described by Jin Kue Wong in "A New Implementation of an Algorithm for the Optimal Assignment Problem: An Improved Version of Munkres' Algorithm".
NettyEventLoopGroupConfig	Event loop group related config.
ProtoUtil
RegionMover	Tool for loading/unloading regions to/from given regionserver This tool can be run from Command line directly as a utility.
RegionMover.RegionMoverBuilder	Builder for Region mover.
RegionSplitCalculator<R extends KeyRange>	This is a generic region split calculator.
RegionSplitter	The RegionSplitter class provides several utilities to help in the administration lifecycle for developers who choose to manually split regions instead of having HBase handle that automatically.
RegionSplitter.HexStringSplit	HexStringSplit is a well-known RegionSplitter.SplitAlgorithm for choosing region boundaries.
RegionSplitter.UniformSplit	A SplitAlgorithm that divides the space of possible keys evenly.
RollingStatCalculator	This class maintains mean and variation for any sequence of input provided to it.
RowBloomContext	Handles ROW bloom related context.
RowColBloomContext	Handles ROWCOL bloom related context.
ServerCommandLine	Base class for command lines that start up various HBase daemons.
ServerRegionReplicaUtil	Similar to RegionReplicaUtil but for the server side
ShutdownHookManager	This class provides ShutdownHookManager shims for HBase to interact with the Hadoop 1.0.x and the Hadoop 2.0+ series.
SortedList<E>	Simple sorted list implementation that uses ArrayList as the underlying collection so we can support RandomAccess.
StealJobQueue<T>	This queue allows a ThreadPoolExecutor to steal jobs from another ThreadPoolExecutor.
YammerHistogramUtils	Utility functions for working with Yammer Metrics.
ZKDataMigrator	utlity method to migrate zookeeper data across HBase versions.

Enum Summary

Enum	Description
HBaseFsck.ErrorReporter.ERROR_CODE
IdReadWriteLock.ReferenceType

Exception Summary

Exception	Description
HBaseFsck.RegionRepairException	Exception thrown when a integrity repair operation fails in an unresolvable way.
LeaseNotRecoveredException	Thrown when the lease was expected to be recovered, but the file can't be opened.