Package org.apache.hadoop.hbase.io

Class WALLink

java.lang.Object

org.apache.hadoop.hbase.io.FileLink

org.apache.hadoop.hbase.io.WALLink

@Private
public class WALLink
extends FileLink

WALLink describes a link to a WAL. An wal can be in /hbase/.logs/<server>/<wal> or it can be in /hbase/.oldlogs/<wal> The link checks first in the original path, if it is not present it fallbacks to the archived path.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.io.FileLink

FileLink.FileLinkInputStream

Field Summary

Fields inherited from class org.apache.hadoop.hbase.io.FileLink

BACK_REFERENCES_DIRECTORY_PREFIX

Constructor Summary

Constructors

Constructor	Description
WALLink(org.apache.hadoop.conf.Configuration conf, String serverName, String logName)
WALLink(org.apache.hadoop.fs.Path walRootDir, String serverName, String logName)
WALLink(org.apache.hadoop.fs.Path originPath, org.apache.hadoop.fs.Path archivePath)

Method Summary

Methods inherited from class org.apache.hadoop.hbase.io.FileLink

equals, exists, getAvailablePath, getBackReferenceFileName, getBackReferencesDir, getFileStatus, getLocations, getUnderlyingFileLinkInputStream, hashCode, isBackReferencesDir, open, open, setLocations, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

WALLink

public WALLink(org.apache.hadoop.conf.Configuration conf,
 String serverName,
 String logName)
        throws IOException

Parameters:

conf - Configuration from which to extract specific archive locations

serverName - Region Server owner of the log

logName - WAL file name

Throws:

IOException - on unexpected error.

WALLink

public WALLink(org.apache.hadoop.fs.Path walRootDir,
 String serverName,
 String logName)

Parameters:

walRootDir - Path to the root directory where hbase files are stored

serverName - Region Server owner of the log

logName - WAL file name

WALLink

public WALLink(org.apache.hadoop.fs.Path originPath,
 org.apache.hadoop.fs.Path archivePath)

Parameters:

originPath - Path to the wal in the log directory

archivePath - Path to the wal in the archived log directory