Package org.apache.hadoop.hdfs.server.namenode

Class FileJournalManager.EditLogFile

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile

Enclosing class:

FileJournalManager

@Private
public static class FileJournalManager.EditLogFile
extends Object

Record of an edit log that has been located and had its filename parsed.

Method Summary

Modifier and Type	Method	Description
File	getFile()
long	getFirstTxId()
long	getLastTxId()
boolean	isInProgress()
void	moveAsideEmptyFile()
void	moveAsideStaleInprogressFile()
void	scanLog(long maxTxIdToScan, boolean verifyVersion)	Find out where the edit log ends.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

getFirstTxId

public long getFirstTxId()

getLastTxId

public long getLastTxId()

scanLog

public void scanLog(long maxTxIdToScan,
 boolean verifyVersion)
             throws IOException

Find out where the edit log ends. This will update the lastTxId of the EditLogFile or mark it as corrupt if it is.

Parameters:

maxTxIdToScan - Maximum Tx ID to try to scan. The scan returns after reading this or a higher ID. The file portion beyond this ID is potentially being updated.

verifyVersion - Whether the scan should verify the layout version

Throws:

IOException

isInProgress

public boolean isInProgress()

getFile

public File getFile()

moveAsideEmptyFile

public void moveAsideEmptyFile()
                        throws IOException

Throws:

IOException

moveAsideStaleInprogressFile

public void moveAsideStaleInprogressFile()
                                  throws IOException

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object