/// <exception cref="System.IO.IOException"/>
public override void Close()
{
if (state == EditLogFileInputStream.State.Open)
{
dataIn.Close();
}
state = EditLogFileInputStream.State.Closed;
}
/// <exception cref="Org.Apache.Hadoop.Hdfs.Server.Namenode.EditLogFileInputStream.LogHeaderCorruptException
/// "/>
/// <exception cref="System.IO.IOException"/>
private void Init(bool verifyLayoutVersion)
{
Preconditions.CheckState(state == EditLogFileInputStream.State.Uninit);
BufferedInputStream bin = null;
try
{
fStream = log.GetInputStream();
bin = new BufferedInputStream(fStream);
tracker = new FSEditLogLoader.PositionTrackingInputStream(bin);
dataIn = new DataInputStream(tracker);
try
{
logVersion = ReadLogVersion(dataIn, verifyLayoutVersion);
}
catch (EOFException)
{
throw new EditLogFileInputStream.LogHeaderCorruptException("No header found in log"
);
}
// We assume future layout will also support ADD_LAYOUT_FLAGS
if (NameNodeLayoutVersion.Supports(LayoutVersion.Feature.AddLayoutFlags, logVersion
) || logVersion < NameNodeLayoutVersion.CurrentLayoutVersion)
{
try
{
LayoutFlags.Read(dataIn);
}
catch (EOFException)
{
throw new EditLogFileInputStream.LogHeaderCorruptException("EOF while reading layout "
+ "flags from log");
}
}
reader = new FSEditLogOp.Reader(dataIn, tracker, logVersion);
reader.SetMaxOpSize(maxOpSize);
state = EditLogFileInputStream.State.Open;
}
finally
{
if (reader == null)
{
IOUtils.Cleanup(Log, dataIn, tracker, bin, fStream);
state = EditLogFileInputStream.State.Closed;
}
}
}
