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

Class NNUpgradeUtil

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.NNUpgradeUtil

public abstract class NNUpgradeUtil
extends Object

Constructor Summary

Constructors

Constructor	Description
NNUpgradeUtil()

Method Summary

Modifier and Type	Method	Description
static void	doUpgrade(Storage.StorageDirectory sd, Storage storage)	Perform the upgrade of the storage dir to the given storage info.
static void	renameCurToTmp(Storage.StorageDirectory sd)	Rename the existing current dir to previous.tmp, and create a new empty current dir.

Methods inherited from class java.lang.Object

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

Constructor Details

NNUpgradeUtil

public NNUpgradeUtil()

Method Details

renameCurToTmp

public static void renameCurToTmp(Storage.StorageDirectory sd)
                           throws IOException

Rename the existing current dir to previous.tmp, and create a new empty current dir.

Throws:

IOException

doUpgrade

public static void doUpgrade(Storage.StorageDirectory sd,
 Storage storage)
                      throws IOException

Perform the upgrade of the storage dir to the given storage info. The new storage info is written into the current directory, and the previous.tmp directory is renamed to previous.

Parameters:

sd - the storage directory to upgrade

storage - info about the new upgraded versions.

Throws:

IOException - in the event of error