org.apache.hadoop.hbase.master

Class MasterWalManager

java.lang.Object

org.apache.hadoop.hbase.master.MasterWalManager

@InterfaceAudience.Private
public class MasterWalManager
extends Object

This class abstracts a bunch of operations the HMaster needs when splitting log files e.g. finding log files, dirs etc.

Constructor Summary

Constructors

Constructor and Description
MasterWalManager(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path rootDir, MasterServices services)
MasterWalManager(MasterServices services)

Method Summary

Modifier and Type	Method and Description
Set<ServerName>	getFailedServersFromLogFolders() Inspect the log directory to find dead servers which need recovery work
org.apache.hadoop.fs.FileSystem	getFileSystem()
void	prepareLogReplay(ServerName serverName, Set<HRegionInfo> regions) Mark regions in recovering state when distributedLogReplay are set true
void	splitLog(ServerName serverName)
void	splitLog(Set<ServerName> serverNames)
void	splitLog(Set<ServerName> serverNames, org.apache.hadoop.fs.PathFilter filter) This method is the base split method that splits WAL files matching a filter.
void	splitMetaLog(ServerName serverName) Specialized method to handle the splitting for meta WAL
void	splitMetaLog(Set<ServerName> serverNames) Specialized method to handle the splitting for meta WAL
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

MasterWalManager

public MasterWalManager(MasterServices services)
                 throws IOException

Throws:

IOException

MasterWalManager

public MasterWalManager(org.apache.hadoop.conf.Configuration conf,
                        org.apache.hadoop.fs.FileSystem fs,
                        org.apache.hadoop.fs.Path rootDir,
                        MasterServices services)
                 throws IOException

Throws:

IOException

Method Detail

stop

public void stop()

getFileSystem

public org.apache.hadoop.fs.FileSystem getFileSystem()

getFailedServersFromLogFolders

public Set<ServerName> getFailedServersFromLogFolders()

Inspect the log directory to find dead servers which need recovery work

Returns:

A set of ServerNames which aren't running but still have WAL files left in file system

splitLog

public void splitLog(ServerName serverName)
              throws IOException

Throws:

IOException

splitMetaLog

public void splitMetaLog(ServerName serverName)
                  throws IOException

Specialized method to handle the splitting for meta WAL

Parameters:

serverName - logs belonging to this server will be split

Throws:

IOException

splitMetaLog

public void splitMetaLog(Set<ServerName> serverNames)
                  throws IOException

Specialized method to handle the splitting for meta WAL

Parameters:

serverNames - logs belonging to these servers will be split

Throws:

IOException

prepareLogReplay

public void prepareLogReplay(ServerName serverName,
                             Set<HRegionInfo> regions)
                      throws IOException

Mark regions in recovering state when distributedLogReplay are set true

Parameters:

serverName - Failed region server whose wals to be replayed

regions - Set of regions to be recovered

Throws:

IOException

splitLog

public void splitLog(Set<ServerName> serverNames)
              throws IOException

Throws:

IOException

splitLog

public void splitLog(Set<ServerName> serverNames,
                     org.apache.hadoop.fs.PathFilter filter)
              throws IOException

This method is the base split method that splits WAL files matching a filter. Callers should pass the appropriate filter for meta and non-meta WALs.

Parameters:

serverNames - logs belonging to these servers will be split; this will rename the log directory out from under a soft-failed server

Throws:

IOException