/// <exception cref="System.IO.IOException"/>
public override void DoPreUpgrade()
{
Log.Info("Starting upgrade of edits directory " + sd.GetRoot());
try
{
NNUpgradeUtil.DoPreUpgrade(conf, sd);
}
catch (IOException ioe)
{
Log.Error("Failed to move aside pre-upgrade storage " + "in image directory " + sd
.GetRoot(), ioe);
throw;
}
}
/// <exception cref="System.IO.IOException"/>
public override void DoRollback()
{
NNUpgradeUtil.DoRollBack(sd);
}
/// <exception cref="System.IO.IOException"/>
public override bool CanRollBack(StorageInfo storage, StorageInfo prevStorage, int
targetLayoutVersion)
{
return(NNUpgradeUtil.CanRollBack(sd, storage, prevStorage, targetLayoutVersion));
}
/// <exception cref="System.IO.IOException"/>
public override void DoFinalize()
{
NNUpgradeUtil.DoFinalize(sd);
}
/// <summary>
/// This method assumes that the fields of the
/// <see cref="Org.Apache.Hadoop.Hdfs.Server.Common.Storage"/>
/// object have
/// already been updated to the appropriate new values for the upgrade.
/// </summary>
/// <exception cref="System.IO.IOException"/>
public override void DoUpgrade(Storage storage)
{
NNUpgradeUtil.DoUpgrade(sd, storage);
}
