org.apache.hadoop.hbase
Class HRegionServer

java.lang.Object
  org.apache.hadoop.hbase.HRegionServer

All Implemented Interfaces:

Runnable, HConstants, HRegionInterface, VersionedProtocol

public class HRegionServer
extends Object
implements HConstants, HRegionInterface, Runnable

HRegionServer makes a set of HRegions available to clients. It checks in with the HMaster. There are many HRegionServers in a single HBase deployment.

Field Summary

protected boolean	abortRequested
protected Integer	cacheFlusherLock
protected Configuration	conf
protected boolean	fsOk
protected ReentrantReadWriteLock	lock
protected HLog	log
protected Integer	logRollerLock
protected SortedMap<Text,HRegion>	onlineRegions
static String	REGIONSERVER
protected Map<Text,HRegion>	retiringRegions
protected HServerInfo	serverInfo
protected Integer	splitOrCompactLock
protected AtomicBoolean	stopRequested
protected int	threadWakeFrequency

Fields inherited from interface org.apache.hadoop.hbase.HConstants

ALL_VERSIONS, COL_REGIONINFO, COL_REGIONINFO_ARRAY, COL_SERVER, COL_SPLITA, COL_SPLITB, COL_STARTCODE, COLUMN_FAMILY, COLUMN_FAMILY_ARRAY, COLUMN_FAMILY_STR, DEFAULT_HBASE_DIR, DEFAULT_HOST, DEFAULT_MASTER_ADDRESS, DEFAULT_MASTER_INFOPORT, DEFAULT_MAX_FILE_SIZE, DEFAULT_REGION_SERVER_CLASS, DEFAULT_REGIONSERVER_ADDRESS, DEFAULT_REGIONSERVER_INFOPORT, EMPTY_START_ROW, EMPTY_TEXT, HBASE_DIR, HREGION_LOGDIR_NAME, HREGION_OLDLOGFILE_NAME, HREGIONDIR_PREFIX, LATEST_TIMESTAMP, MASTER_ADDRESS, META_TABLE_NAME, REGION_SERVER_CLASS, REGIONSERVER_ADDRESS, ROOT_TABLE_NAME, THREAD_WAKE_FREQUENCY, UTF8_ENCODING

Fields inherited from interface org.apache.hadoop.hbase.HRegionInterface

versionID

Constructor Summary

HRegionServer(Configuration conf)
Starts a HRegionServer at the default location

HRegionServer(HServerAddress address, Configuration conf)
Starts a HRegionServer at the specified location

Method Summary

void	batchUpdate(Text regionName, long timestamp, BatchUpdate b) Applies a batch of updates via one RPC
protected boolean	checkFileSystem() Checks to see if the file system is still accessible.
void	close(long scannerId) Close a scanner
protected void	commit(Text regionName, long lockid, long timestamp)
protected void	delete(Text regionName, long lockid, Text column)
void	deleteAll(Text regionName, Text row, Text column, long timestamp) Delete all cells that match the passed row and column and whose timestamp is equal-to or older than the passed timestamp.
protected static void	doMain(String[] args, Class<? extends HRegionServer> regionServerClass) Do class main.
byte[]	get(Text regionName, Text row, Text column) Retrieve a single value from the specified region for the specified row and column keys
byte[][]	get(Text regionName, Text row, Text column, int numVersions) Get the specified number of versions of the specified row and column
byte[][]	get(Text regionName, Text row, Text column, long timestamp, int numVersions) Get the specified number of versions of the specified row and column with the specified timestamp.
SortedMap<Text,HRegion>	getOnlineRegions()
long	getProtocolVersion(String protocol, long clientVersion) Return protocol version corresponding to protocol interface.
protected HRegion	getRegion(Text regionName) Protected utility method for safely obtaining an HRegion handle.
protected HRegion	getRegion(Text regionName, boolean checkRetiringRegions) Protected utility method for safely obtaining an HRegion handle.
HRegionInfo	getRegionInfo(Text regionName) Get metainfo about an HRegion
protected List<HRegion>	getRegionsToCheck()
AtomicInteger	getRequestCount()
MapWritable	getRow(Text regionName, Text row) Get all the data for the specified row
HServerInfo	getServerInfo()
static void	main(String[] args)
MapWritable	next(long scannerId) Get the next set of values
long	openScanner(Text regionName, Text[] cols, Text firstRow, long timestamp, RowFilterInterface filter) Opens a remote scanner with a RowFilter.
protected void	put(Text regionName, long lockid, Text column, byte[] val)
void	run() The HRegionServer sticks in this loop until closed.
protected long	startUpdate(Text regionName, Text row)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

stopRequested

protected final AtomicBoolean stopRequested

abortRequested

protected volatile boolean abortRequested

fsOk

protected volatile boolean fsOk

serverInfo

protected final HServerInfo serverInfo

conf

protected final Configuration conf

onlineRegions

protected final SortedMap<Text,HRegion> onlineRegions

retiringRegions

protected final Map<Text,HRegion> retiringRegions

lock

protected final ReentrantReadWriteLock lock

threadWakeFrequency

protected final int threadWakeFrequency

REGIONSERVER

public static final String REGIONSERVER

See Also:

Constant Field Values

splitOrCompactLock

protected final Integer splitOrCompactLock

cacheFlusherLock

protected final Integer cacheFlusherLock

log

protected HLog log

logRollerLock

protected final Integer logRollerLock

Constructor Detail

HRegionServer

public HRegionServer(Configuration conf)
              throws IOException

Starts a HRegionServer at the default location

Parameters:

conf -

Throws:

IOException

HRegionServer

public HRegionServer(HServerAddress address,
                     Configuration conf)
              throws IOException

Starts a HRegionServer at the specified location

Parameters:

address -

conf -

Throws:

IOException

Method Detail

run

public void run()

The HRegionServer sticks in this loop until closed. It repeatedly checks in with the HMaster, sending heartbeats & reports, and receiving HRegion load/unload instructions.

Specified by:

run in interface Runnable

getRegionInfo

public HRegionInfo getRegionInfo(Text regionName)
                          throws NotServingRegionException

Get metainfo about an HRegion

Specified by:

getRegionInfo in interface HRegionInterface

Parameters:

regionName - name of the region

Returns:

HRegionInfo object for region

Throws:

NotServingRegionException

get

public byte[] get(Text regionName,
                  Text row,
                  Text column)
           throws IOException

Retrieve a single value from the specified region for the specified row and column keys

Specified by:

get in interface HRegionInterface

Parameters:

regionName - name of region

row - row key

column - column key

Returns:

alue for that region/row/column

Throws:

IOException

get

public byte[][] get(Text regionName,
                    Text row,
                    Text column,
                    int numVersions)
             throws IOException

Get the specified number of versions of the specified row and column

Specified by:

get in interface HRegionInterface

Parameters:

regionName - region name

row - row key

column - column key

numVersions - number of versions to return

Returns:

array of values

Throws:

IOException

get

public byte[][] get(Text regionName,
                    Text row,
                    Text column,
                    long timestamp,
                    int numVersions)
             throws IOException

Get the specified number of versions of the specified row and column with the specified timestamp.

Specified by:

get in interface HRegionInterface

Parameters:

regionName - region name

row - row key

column - column key

timestamp - timestamp

numVersions - number of versions to return

Returns:

array of values

Throws:

IOException

getRow

public MapWritable getRow(Text regionName,
                          Text row)
                   throws IOException

Get all the data for the specified row

Specified by:

getRow in interface HRegionInterface

Parameters:

regionName - region name

row - row key

Returns:

map of values

Throws:

IOException

next

public MapWritable next(long scannerId)
                 throws IOException

Get the next set of values

Specified by:

next in interface HRegionInterface

Parameters:

scannerId - clientId passed to openScanner

Returns:

map of values

Throws:

IOException

batchUpdate

public void batchUpdate(Text regionName,
                        long timestamp,
                        BatchUpdate b)
                 throws IOException

Applies a batch of updates via one RPC

Specified by:

batchUpdate in interface HRegionInterface

Parameters:

regionName - name of the region to update

timestamp - the time to be associated with the changes

b - BatchUpdate

Throws:

IOException

openScanner

public long openScanner(Text regionName,
                        Text[] cols,
                        Text firstRow,
                        long timestamp,
                        RowFilterInterface filter)
                 throws IOException

Description copied from interface: HRegionInterface

Opens a remote scanner with a RowFilter.

Specified by:

openScanner in interface HRegionInterface

Parameters:

regionName - name of region to scan

cols - columns to scan. If column name is a column family, all columns of the specified column family are returned. Its also possible to pass a regex for column family name. A column name is judged to be regex if it contains at least one of the following characters: \+|^&*$[]]}{)(.

firstRow - starting row to scan

timestamp - only return values whose timestamp is <= this value

filter - RowFilter for filtering results at the row-level.

Returns:

scannerId scanner identifier used in other calls

Throws:

IOException

close

public void close(long scannerId)
           throws IOException

Close a scanner

Specified by:

close in interface HRegionInterface

Parameters:

scannerId - the scanner id returned by openScanner

Throws:

IOException

startUpdate

protected long startUpdate(Text regionName,
                           Text row)
                    throws IOException

Throws:

IOException

put

protected void put(Text regionName,
                   long lockid,
                   Text column,
                   byte[] val)
            throws IOException

Throws:

IOException

delete

protected void delete(Text regionName,
                      long lockid,
                      Text column)
               throws IOException

Throws:

IOException

deleteAll

public void deleteAll(Text regionName,
                      Text row,
                      Text column,
                      long timestamp)
               throws IOException

Delete all cells that match the passed row and column and whose timestamp is equal-to or older than the passed timestamp.

Specified by:

deleteAll in interface HRegionInterface

Parameters:

regionName - region name

row - row key

column - column key

timestamp - Delete all entries that have this timestamp or older

Throws:

IOException

commit

protected void commit(Text regionName,
                      long lockid,
                      long timestamp)
               throws IOException

Throws:

IOException

getServerInfo

public HServerInfo getServerInfo()

Returns:

Info on this server.

getOnlineRegions

public SortedMap<Text,HRegion> getOnlineRegions()

Returns:

Immutable list of this servers regions.

getRequestCount

public AtomicInteger getRequestCount()

getRegion

protected HRegion getRegion(Text regionName)
                     throws NotServingRegionException

Protected utility method for safely obtaining an HRegion handle.

Parameters:

regionName - Name of online HRegion to return

Returns:

HRegion for regionName

Throws:

NotServingRegionException

getRegion

protected HRegion getRegion(Text regionName,
                            boolean checkRetiringRegions)
                     throws NotServingRegionException

Protected utility method for safely obtaining an HRegion handle.

Parameters:

regionName - Name of online HRegion to return

checkRetiringRegions - Set true if we're to check retiring regions as well as online regions.

Returns:

HRegion for regionName

Throws:

NotServingRegionException

checkFileSystem

protected boolean checkFileSystem()

Checks to see if the file system is still accessible. If not, sets abortRequested and stopRequested

Returns:

false if file system is not available

getRegionsToCheck

protected List<HRegion> getRegionsToCheck()

Returns:

Returns list of non-closed regions hosted on this server. If no regions to check, returns an empty list.

getProtocolVersion

public long getProtocolVersion(String protocol,
                               long clientVersion)
                        throws IOException

Return protocol version corresponding to protocol interface.

Specified by:

getProtocolVersion in interface VersionedProtocol

Parameters:

protocol - The classname of the protocol interface

clientVersion - The version of the protocol that the client speaks

Returns:

the version that the server will speak

Throws:

IOException

doMain

protected static void doMain(String[] args,
                             Class<? extends HRegionServer> regionServerClass)

Do class main.

Parameters:

args -

regionServerClass - HRegionServer to instantiate.

main

public static void main(String[] args)

Parameters:

args -