Package org.apache.hadoop.hbase.regionserver

Interface Summary
ChangedReadersObserver If set of MapFile.Readers in Store change, implementors are notified.
ColumnTracker Implementing classes of this interface will be used for the tracking and enforcement of columns and numbers of versions and timeToLive during the course of a Get or Scan operation.
CompactionRequestor  
DeleteTracker This interface is used for the tracking and enforcement of Deletes during the course of a Get or Scan operation.
FlushRequester Request a flush.
HRegion.BulkLoadListener Listener class to enable callers of bulkLoadHFile() to perform any necessary pre/post processing of a given bulkload call
InternalScanner Internal scanners differ from client-side scanners in that they operate on HStoreKeys and byte[] instead of RowResults.
KeyValueScanner Scanner that returns the next KeyValue.
LeaseListener LeaseListener is an interface meant to be implemented by users of the Leases class.
MXBean This is the JMX management interface for HBase Region Server information
RegionScanner RegionScanner describes iterators over rows in an HRegion.
RegionServerServices Services provided by HRegionServer
ReplicationService Gateway to Cluster Replication.
ReplicationSinkService A sink for a replication stream has to expose this service.
ReplicationSourceService A source for a replication stream has to expose this service.
SplitLogWorker.TaskExecutor Objects implementing this interface actually do the task that has been acquired by a SplitLogWorker.
 

Class Summary
ColumnCount Simple wrapper for a byte buffer and a counter.
CompactionTool  
CompactSplitThread Compact region on request and then run split if appropriate
ConstantSizeRegionSplitPolicy A RegionSplitPolicy implementation which splits a region as soon as any of its store files exceeds a maximum configurable size.
DebugPrint  
DelimitedKeyPrefixRegionSplitPolicy A custom RegionSplitPolicy implementing a SplitPolicy that groups rows by a prefix of the row-key with a delimiter.
DisabledRegionSplitPolicy A RegionSplitPolicy that disables region splits.
ExplicitColumnTracker This class is used for the tracking and enforcement of columns and numbers of versions during the course of a Get or Scan operation, when explicit column qualifiers have been asked for in the query.
HRegion HRegion stores data for a certain region of a table.
HRegionFileSystem Acts as an abstraction layer b/w HBase and underlying fs.
HRegionServer HRegionServer makes a set of HRegions available to clients.
HRegionServerCommandLine Class responsible for parsing the command line and starting the RegionServer.
HRegionThriftServer HRegionThriftServer - this class starts up a Thrift server in the same JVM where the RegionServer is running.
IncreasingToUpperBoundRegionSplitPolicy Split size is the number of regions that are on this server that all are of the same table, squared, times the region flush size OR the maximum region split size, whichever is smaller.
KeyPrefixRegionSplitPolicy A custom RegionSplitPolicy implementing a SplitPolicy that groups rows by a prefix of the row-key This ensures that a region is not split "inside" a prefix of a row key.
KeyValueHeap Implements a heap merge across any number of KeyValueScanners.
Leases Leases There are several server classes in HBase that need to track external clients that occasionally send heartbeats.
LruHashMap<K extends HeapSize,V extends HeapSize> The LruHashMap is a memory-aware HashMap with a configurable maximum memory footprint.
LruHashMap.Entry<K extends HeapSize,V extends HeapSize> Entry to store key/value mappings.
MemStore The MemStore holds in-memory modifications to the Store.
MemStoreLAB A memstore-local allocation buffer.
MemStoreLAB.Allocation The result of a single allocation.
MiniBatchOperationInProgress<T> Wraps together the mutations which are applied as a batch to the region and their operation status and WALEdits.
MultiVersionConsistencyControl Manages the read/write consistency within memstore.
MultiVersionConsistencyControl.WriteEntry  
MXBeanImpl Impl for exposing Region Server Information through JMX
NonLazyKeyValueScanner A "non-lazy" scanner which always does a real seek operation.
OperationStatus This class stores the Operation status code and the exception message that occurs in case of failure of operations like put, delete, etc.
RegionCoprocessorHost Implements the coprocessor environment and runtime support for coprocessors loaded within a HRegion.
RegionServerAccounting RegionServerAccounting keeps record of some basic real time information about the Region Server.
RegionServerCoprocessorHost  
RegionSplitPolicy A split policy determines when a region should be split.
RSDumpServlet  
RSStatusServlet  
ScanDeleteTracker This class is responsible for the tracking and enforcement of Deletes during the course of a Scan operation.
ScanQueryMatcher A query matcher that is specifically designed for the scan case.
ScanWildcardColumnTracker Keeps track of the columns for a scan if they are not explicitly specified
ShutdownHook Manage regionserver shutdown hooks.
SplitLogWorker This worker is spawned in every regionserver (should we also spawn one in the master?).
SplitTransaction Executes region split as a "transaction".
Store A Store holds a column family in a Region.
Store.ScanInfo Immutable information for scans over a store.
StoreFile A Store data file.
StoreFile.Reader Reader for a StoreFile.
StoreFile.Writer A StoreFile writer.
StoreFile.WriterBuilder  
StoreFileScanner KeyValueScanner adaptor over the Reader.
StoreScanner Scanner scans both the memstore and the HStore.
TimeRangeTracker Stores the minimum and maximum timestamp values (both are inclusive).
 

Enum Summary
DeleteTracker.DeleteCompare Return codes for comparison of two Deletes.
DeleteTracker.DeleteResult Returns codes for delete result.
RegionOpeningState  
ScanQueryMatcher.MatchCode ScanQueryMatcher.match(org.apache.hadoop.hbase.KeyValue) return codes.
ScanType Enum to distinguish general scan types.
SplitLogWorker.TaskExecutor.Status  
StoreFile.BloomType  
 

Exception Summary
LeaseException Reports a problem with a lease
Leases.LeaseStillHeldException Thrown if we are asked create a lease but lease on passed name already exists.
NoSuchColumnFamilyException Thrown if request for nonexistent column family.
RegionAlreadyInTransitionException This exception is thrown when a region server is asked to open or close a region but it's already processing it
RegionServerRunningException Thrown if the region server log directory exists (which indicates another region server is running at the same address)
RegionServerStoppedException Thrown by the region server when it is in shutting down state.
WrongRegionException Thrown when a request contains a key which is not part of this region
 



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