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() Deprecated. With proc-v2, we can record the crash server with procedure store, so do not need to scan the wal directory to find out the splitting wal directory any more. Leave it here only because RecoverMetaProcedure(which is also deprecated) uses it.
org.apache.hadoop.fs.FileSystem	getFileSystem()
Set<ServerName>	getLiveServersFromWALDir()
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()

getLiveServersFromWALDir

public Set<ServerName> getLiveServersFromWALDir()
                                         throws IOException

Throws:

IOException

getFailedServersFromLogFolders

@Deprecated
public Set<ServerName> getFailedServersFromLogFolders()

Deprecated. With proc-v2, we can record the crash server with procedure store, so do not need to scan the wal directory to find out the splitting wal directory any more. Leave it here only because RecoverMetaProcedure(which is also deprecated) uses it.

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

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