org.apache.hadoop.hbase.master.region

Class MasterRegion

java.lang.Object

org.apache.hadoop.hbase.master.region.MasterRegion

@InterfaceAudience.Private
public final class MasterRegion
extends Object

A region that stores data in a separated directory, which can be used to store master local data.

FileSystem layout:

 hbase
   |
   --<region dir>
       |
       --data
       |  |
       |  --/<ns>/<table>/<encoded-region-name> <---- The region data
       |      |
       |      --replay <---- The edits to replay
       |
       --WALs
          |
          --<master-server-name> <---- The WAL dir for active master
          |
          --<master-server-name>-dead <---- The WAL dir for dead master
 

Notice that, you can use different root file system and WAL file system. Then the above directory will be on two file systems, the root file system will have the data directory while the WAL filesystem will have the WALs directory. The archived HFile will be moved to the global HFile archived directory with the MasterRegionParams.archivedWalSuffix() suffix. The archived WAL will be moved to the global WAL archived directory with the MasterRegionParams.archivedHFileSuffix() suffix.

Method Summary

Modifier and Type	Method and Description
void	close(boolean abort)
static MasterRegion	create(MasterRegionParams params)
HRegion.FlushResult	flush(boolean force)
Result	get(Get get) The design for master region is to only load all the data to memory at once when starting, so typically you should not use the get method to get a single row of data at runtime.
RegionScanner	getRegionScanner(Scan scan)
ResultScanner	getScanner(Scan scan)
void	requestRollAll()
void	update(UpdateMasterRegion action)
void	waitUntilWalRollFinished()

Methods inherited from class java.lang.Object

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

Method Detail

update

public void update(UpdateMasterRegion action)
            throws IOException

Throws:

IOException

get

public Result get(Get get)
           throws IOException

The design for master region is to only load all the data to memory at once when starting, so typically you should not use the get method to get a single row of data at runtime.

Throws:

IOException

getScanner

public ResultScanner getScanner(Scan scan)
                         throws IOException

Throws:

IOException

getRegionScanner

public RegionScanner getRegionScanner(Scan scan)
                               throws IOException

Throws:

IOException

flush

public HRegion.FlushResult flush(boolean force)
                          throws IOException

Throws:

IOException

requestRollAll

public void requestRollAll()

waitUntilWalRollFinished

public void waitUntilWalRollFinished()
                              throws InterruptedException

Throws:

InterruptedException

close

public void close(boolean abort)

create

public static MasterRegion create(MasterRegionParams params)
                           throws IOException

Throws:

IOException